/* * sh.c: Main shell routines */ /*- * Copyright (c) 1980, 1991 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #define EXTERN /* Intern */ #include "sh.h" #ifndef lint char copyright[] = "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ All rights reserved.\n"; #endif /* not lint */ RCSID("$Id: sh.c,v 1.2 2005/01/19 11:12:50 ernst Exp $") #include "tc.h" #include "ed.h" #include "tw.h" extern bool MapsAreInited; extern bool NLSMapsAreInited; extern bool NoNLSRebind; /* * C Shell * * Bill Joy, UC Berkeley, California, USA * October 1978, May 1980 * * Jim Kulp, IIASA, Laxenburg, Austria * April 1980 * * Filename recognition added: * Ken Greer, Ind. Consultant, Palo Alto CA * October 1983. * * Karl Kleinpaste, Computer Consoles, Inc. * Added precmd, periodic/tperiod, prompt changes, * directory stack hack, and login watch. * Sometime March 1983 - Feb 1984. * * Added scheduled commands, including the "sched" command, * plus the call to sched_run near the precmd et al * routines. * Upgraded scheduled events for running events while * sitting idle at command input. * * Paul Placeway, Ohio State * added stuff for running with twenex/inputl 9 Oct 1984. * * ported to Apple Unix (TM) (OREO) 26 -- 29 Jun 1987 */ jmp_buf_t reslab INIT_ZERO_STRUCT; static const char tcshstr[] = "tcsh"; #ifdef WINNT static const char tcshstr_nt[] = "tcsh.exe"; #endif /* WINNT */ signalfun_t parintr = 0; /* Parents interrupt catch */ signalfun_t parterm = 0; /* Parents terminate catch */ #ifdef TESLA int do_logout = 0; #endif /* TESLA */ bool use_fork = 0; /* use fork() instead of vfork()? */ /* * Magic pointer values. Used to specify other invalid conditions aside * from null. */ static Char INVCHAR; Char *INVPTR = &INVCHAR; Char **INVPPTR = &INVPTR; static int nofile = 0; static bool reenter = 0; static bool nverbose = 0; static bool nexececho = 0; static bool quitit = 0; static bool rdirs = 0; bool fast = 0; static bool batch = 0; static bool mflag = 0; static bool prompt = 1; static int enterhist = 0; bool tellwhat = 0; time_t t_period; Char *ffile = NULL; bool dolzero = 0; int insource = 0; static time_t chktim; /* Time mail last checked */ char *progname; int tcsh; extern char **environ; /* * This preserves the input state of the shell. It is used by * st_save and st_restore to manupulate shell state. */ struct saved_state { int insource; int SHIN; int intty; struct whyle *whyles; Char *gointr; Char *arginp; Char *evalp; Char **evalvec; Char *alvecp; Char **alvec; int onelflg; bool enterhist; Char **argv; Char HIST; bool cantell; struct Bin B; /* These keep signal state and setjump state */ #ifdef BSDSIGS sigmask_t mask; #endif jmp_buf_t oldexit; int reenter; }; static int srccat __P((Char *, Char *)); static int srcfile __P((char *, bool, int, Char **)); static sigret_t phup __P((int)); static void srcunit __P((int, bool, int, Char **)); static void mailchk __P((void)); #ifndef _PATH_DEFPATH static Char **defaultpath __P((void)); #endif static void record __P((void)); static void st_save __P((struct saved_state *, int, int, Char **, Char **)); static void st_restore __P((struct saved_state *, Char **)); int main __P((int, char **)); int main(argc, argv) int argc; char **argv; { register Char *cp; #ifdef AUTOLOGOUT register Char *cp2; #endif register char *tcp, *ttyn; register int f; register char **tempv; #ifdef BSDSIGS sigvec_t osv; #endif /* BSDSIGS */ #ifdef WINNT nt_init(); #endif /* WINNT */ #if defined(NLS_CATALOGS) && defined(LC_MESSAGES) (void) setlocale(LC_MESSAGES, ""); #endif /* NLS_CATALOGS && LC_MESSAGES */ #ifdef NLS # ifdef LC_CTYPE (void) setlocale(LC_CTYPE, ""); /* for iscntrl */ # endif /* LC_CTYPE */ #endif /* NLS */ nlsinit(); #ifdef MALLOC_TRACE mal_setstatsfile(fdopen(dup2(open("/tmp/tcsh.trace", O_WRONLY|O_CREAT, 0666), 25), "w")); mal_trace(1); #endif /* MALLOC_TRACE */ #if !(defined(BSDTIMES) || defined(_SEQUENT_)) && defined(POSIX) # ifdef _SC_CLK_TCK clk_tck = (clock_t) sysconf(_SC_CLK_TCK); # else /* ! _SC_CLK_TCK */ # ifdef CLK_TCK clk_tck = CLK_TCK; # else /* !CLK_TCK */ clk_tck = HZ; # endif /* CLK_TCK */ # endif /* _SC_CLK_TCK */ #endif /* !BSDTIMES && POSIX */ settimes(); /* Immed. estab. timing base */ #ifdef TESLA do_logout = 0; #endif /* TESLA */ /* * Make sure we have 0, 1, 2 open * Otherwise `` jobs will not work... (From knaff@poly.polytechnique.fr) */ { do if ((f = open(_PATH_DEVNULL, O_RDONLY)) == -1 && (f = open("/", O_RDONLY)) == -1) exit(1); while (f < 3); (void) close(f); } osinit(); /* Os dependent initialization */ { char *t; t = strrchr(argv[0], '/'); #ifdef WINNT { char *s = strrchr(argv[0], '\\'); if (s) t = s; } #endif /* WINNT */ t = t ? t + 1 : argv[0]; if (*t == '-') t++; progname = strsave((t && *t) ? t : tcshstr); /* never want a null */ tcsh = strcmp(progname, tcshstr) == 0 || strcmp(progname, "qtcsh") == 0; } /* * Initialize non constant strings */ #ifdef _PATH_BSHELL STR_BSHELL = SAVE(_PATH_BSHELL); #endif #ifdef _PATH_TCSHELL STR_SHELLPATH = SAVE(_PATH_TCSHELL); #else # ifdef _PATH_CSHELL STR_SHELLPATH = SAVE(_PATH_CSHELL); # endif #endif STR_environ = blk2short(environ); environ = short2blk(STR_environ); /* So that we can free it */ STR_WORD_CHARS = SAVE(WORD_CHARS); HIST = '!'; HISTSUB = '^'; PRCH = '>'; PRCHROOT = '#'; word_chars = STR_WORD_CHARS; bslash_quote = 0; /* PWP: do tcsh-style backslash quoting? */ /* Default history size to 100 */ set(STRhistory, SAVE("100"), VAR_READWRITE); tempv = argv; ffile = SAVE(tempv[0]); dolzero = 0; if (eq(ffile, STRaout)) /* A.out's are quittable */ quitit = 1; uid = getuid(); gid = getgid(); euid = geteuid(); egid = getegid(); #if defined(OREO) || defined(DT_SUPPORT) /* * We are a login shell if: 1. we were invoked as - with * optional arguments 2. or we were invoked only with the -l flag */ loginsh = (**tempv == '-') || (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && tempv[1][2] == '\0'); #else /* * We are a login shell if: 1. we were invoked as - and we had * no arguments 2. or we were invoked only with the -l flag */ loginsh = (**tempv == '-' && argc == 1) || (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && tempv[1][2] == '\0'); #endif #ifdef _VMS_POSIX /* No better way to find if we are a login shell */ if (!loginsh) { loginsh = (argc == 1 && getppid() == 1); **tempv = '-'; /* Avoid giving VMS an acidic stomach */ } #endif /* _VMS_POSIX */ if (loginsh && **tempv != '-') { /* * Mangle the argv space */ tempv[1][0] = '\0'; tempv[1][1] = '\0'; tempv[1] = NULL; for (tcp = *tempv; *tcp++;) continue; for (tcp--; tcp >= *tempv; tcp--) tcp[1] = tcp[0]; *++tcp = '-'; argc--; } if (loginsh) { (void) time(&chktim); set(STRloginsh, Strsave(STRNULL), VAR_READWRITE); } AsciiOnly = 1; NoNLSRebind = getenv("NOREBIND") != NULL; #ifdef NLS # ifdef SETLOCALEBUG dont_free = 1; # endif /* SETLOCALEBUG */ (void) setlocale(LC_ALL, ""); # ifdef LC_COLLATE (void) setlocale(LC_COLLATE, ""); # endif # ifdef SETLOCALEBUG dont_free = 0; # endif /* SETLOCALEBUG */ # ifdef STRCOLLBUG fix_strcoll_bug(); # endif /* STRCOLLBUG */ { int k; for (k = 0200; k <= 0377 && !Isprint(k); k++) continue; AsciiOnly = k > 0377; } #else AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; #endif /* NLS */ if (MapsAreInited && !NLSMapsAreInited) ed_InitNLSMaps(); ResetArrowKeys(); /* * Initialize for periodic command intervals. Also, initialize the dummy * tty list for login-watch. */ (void) time(&t_period); #ifndef HAVENOUTMP initwatch(); #endif /* !HAVENOUTMP */ #if defined(alliant) /* * From: Jim Pace * tcsh does not work properly on the alliants through an rlogin session. * The shell generally hangs. Also, reference to the controlling terminal * does not work ( ie: echo foo > /dev/tty ). * * A security feature was added to rlogind affecting FX/80's Concentrix * from revision 5.5.xx upwards (through 5.7 where this fix was implemented) * This security change also affects the FX/2800 series. * The security change to rlogind requires the process group of an rlogin * session become disassociated with the tty in rlogind. * * The changes needed are: * 1. set the process group * 2. reenable the control terminal */ if (loginsh && isatty(SHIN)) { ttyn = (char *) ttyname(SHIN); (void) close(SHIN); SHIN = open(ttyn, O_RDWR); shpgrp = getpid(); (void) ioctl (SHIN, TIOCSPGRP, (ioctl_t) &shpgrp); (void) setpgid(0, shpgrp); } #endif /* alliant */ /* * Move the descriptors to safe places. The variable didfds is 0 while we * have only FSH* to work with. When didfds is true, we have 0,1,2 and * prefer to use these. */ initdesc(); /* * Get and set the tty now */ if ((ttyn = ttyname(SHIN)) != NULL) { /* * Could use rindex to get rid of other possible path components, but * hpux preserves the subdirectory /pty/ when storing the tty name in * utmp, so we keep it too. */ if (strncmp(ttyn, "/dev/", 5) == 0) set(STRtty, cp = SAVE(ttyn + 5), VAR_READWRITE); else set(STRtty, cp = SAVE(ttyn), VAR_READWRITE); } else set(STRtty, cp = SAVE(""), VAR_READWRITE); /* * Initialize the shell variables. ARGV and PROMPT are initialized later. * STATUS is also munged in several places. CHILD is munged when * forking/waiting */ /* * 7-10-87 Paul Placeway autologout should be set ONLY on login shells and * on shells running as root. Out of these, autologout should NOT be set * for any psudo-terminals (this catches most window systems) and not for * any terminal running X windows. * * At Ohio State, we have had problems with a user having his X session * drop out from under him (on a Sun) because the shell in his master * xterm timed out and exited. * * Really, this should be done with a program external to the shell, that * watches for no activity (and NO running programs, such as dump) on a * terminal for a long peroid of time, and then SIGHUPS the shell on that * terminal. * * bugfix by Rich Salz : For root rsh things * allways first check to see if loginsh or really root, then do things * with ttyname() * * Also by Jean-Francois Lamy : check the * value of cp before using it! ("root can rsh too") * * PWP: keep the nested ifs; the order of the tests matters and a good * (smart) C compiler might re-arange things wrong. */ #ifdef AUTOLOGOUT # ifdef convex if (uid == 0) { /* root always has a 15 minute autologout */ set(STRautologout, Strsave(STRrootdefautologout), VAR_READWRITE); } else if (loginsh) /* users get autologout set to 0 */ set(STRautologout, Strsave(STR0), VAR_READWRITE); # else /* convex */ if (loginsh || (uid == 0)) { if (*cp) { /* only for login shells or root and we must have a tty */ if ((cp2 = Strrchr(cp, (Char) '/')) != NULL) { cp = cp2 + 1; } else cp2 = cp; if (!(((Strncmp(cp2, STRtty, 3) == 0) && Isalpha(cp2[3])) || ((Strncmp(cp, STRpts, 3) == 0) && cp[3] == '/'))) { if (getenv("DISPLAY") == NULL) { /* NOT on X window shells */ set(STRautologout, Strsave(STRdefautologout), VAR_READWRITE); } } } } # endif /* convex */ #endif /* AUTOLOGOUT */ (void) sigset(SIGALRM, alrmcatch); set(STRstatus, Strsave(STR0), VAR_READWRITE); /* * get and set machine specific envirnment variables */ getmachine(); fix_version(); /* publish the shell version */ /* * Publish the selected echo style */ #if ECHO_STYLE == NONE_ECHO set(STRecho_style, Strsave(STRnone), VAR_READWRITE); #endif /* ECHO_STYLE == NONE_ECHO */ #if ECHO_STYLE == BSD_ECHO set(STRecho_style, Strsave(STRbsd), VAR_READWRITE); #endif /* ECHO_STYLE == BSD_ECHO */ #if ECHO_STYLE == SYSV_ECHO set(STRecho_style, Strsave(STRsysv), VAR_READWRITE); #endif /* ECHO_STYLE == SYSV_ECHO */ #if ECHO_STYLE == BOTH_ECHO set(STRecho_style, Strsave(STRboth), VAR_READWRITE); #endif /* ECHO_STYLE == BOTH_ECHO */ /* * increment the shell level. */ shlvl(1); if ((tcp = getenv("HOME")) != NULL) cp = quote(SAVE(tcp)); else cp = NULL; if (cp == NULL) fast = 1; /* No home -> can't read scripts */ else set(STRhome, cp, VAR_READWRITE); dinit(cp); /* dinit thinks that HOME == cwd in a login * shell */ /* * Grab other useful things from the environment. Should we grab * everything?? */ { char *cln, *cus, *cgr; Char buff[BUFSIZE]; struct passwd *pw; struct group *gr; #ifdef apollo int oid = getoid(); (void) Itoa(oid, buff, 0, 0); set(STRoid, Strsave(buff), VAR_READWRITE); #endif /* apollo */ (void) Itoa(uid, buff, 0, 0); set(STRuid, Strsave(buff), VAR_READWRITE); (void) Itoa(gid, buff, 0, 0); set(STRgid, Strsave(buff), VAR_READWRITE); cln = getenv("LOGNAME"); cus = getenv("USER"); if (cus != NULL) set(STRuser, quote(SAVE(cus)), VAR_READWRITE); else if (cln != NULL) set(STRuser, quote(SAVE(cln)), VAR_READWRITE); else if ((pw = getpwuid(uid)) == NULL) set(STRuser, SAVE("unknown"), VAR_READWRITE); else set(STRuser, SAVE(pw->pw_name), VAR_READWRITE); if (cln == NULL) tsetenv(STRLOGNAME, varval(STRuser)); if (cus == NULL) tsetenv(STRKUSER, varval(STRuser)); cgr = getenv("GROUP"); if (cgr != NULL) set(STRgroup, quote(SAVE(cgr)), VAR_READWRITE); #ifdef INTERIX else if ((gr = getgrgid_nomembers(gid)) == NULL) set(STRgroup, SAVE("unknown"), VAR_READWRITE); #else else if ((gr = getgrgid(gid)) == NULL) set(STRgroup, SAVE("unknown"), VAR_READWRITE); #endif else set(STRgroup, SAVE(gr->gr_name), VAR_READWRITE); if (cgr == NULL) tsetenv(STRKGROUP, varval(STRgroup)); } /* * HOST may be wrong, since rexd transports the entire environment on sun * 3.x Just set it again */ { char cbuff[MAXHOSTNAMELEN]; if (gethostname(cbuff, sizeof(cbuff)) >= 0) { cbuff[sizeof(cbuff) - 1] = '\0'; /* just in case */ tsetenv(STRHOST, str2short(cbuff)); } else tsetenv(STRHOST, str2short("unknown")); } #ifdef REMOTEHOST /* * Try to determine the remote host we were logged in from. */ remotehost(); #endif /* REMOTEHOST */ #ifdef apollo if ((tcp = getenv("SYSTYPE")) == NULL) tcp = "bsd4.3"; tsetenv(STRSYSTYPE, quote(str2short(tcp))); #endif /* apollo */ /* * set editing on by default, unless running under Emacs as an inferior * shell. * We try to do this intelligently. If $TERM is available, then it * should determine if we should edit or not. $TERM is preserved * across rlogin sessions, so we will not get confused if we rlogin * under an emacs shell. Another advantage is that if we run an * xterm under an emacs shell, then the $TERM will be set to * xterm, so we are going to want to edit. Unfortunately emacs * does not restore all the tty modes, so xterm is not very well * set up. But this is not the shell's fault. * Also don't edit if $TERM == wm, for when we're running under an ATK app. * Finally, emacs compiled under terminfo, sets the terminal to dumb, * so disable editing for that too. * * Unfortunately, in some cases the initial $TERM setting is "unknown", * "dumb", or "network" which is then changed in the user's startup files. * We fix this by setting noediting here if $TERM is unknown/dumb and * if noediting is set, we switch on editing if $TERM is changed. */ if ((tcp = getenv("TERM")) != NULL) { set(STRterm, quote(SAVE(tcp)), VAR_READWRITE); noediting = strcmp(tcp, "unknown") == 0 || strcmp(tcp, "dumb") == 0 || strcmp(tcp, "network") == 0; editing = strcmp(tcp, "emacs") != 0 && strcmp(tcp, "wm") != 0 && !noediting; } else { noediting = 0; editing = ((tcp = getenv("EMACS")) == NULL || strcmp(tcp, "t") != 0); } /* * The 'edit' variable is either set or unset. It doesn't * need a value. Making it 'emacs' might be confusing. */ if (editing) set(STRedit, Strsave(STRNULL), VAR_READWRITE); /* * still more mutability: make the complete routine automatically add the * suffix of file names... */ set(STRaddsuffix, Strsave(STRNULL), VAR_READWRITE); /* * Re-initialize path if set in environment */ if ((tcp = getenv("PATH")) == NULL) #ifdef _PATH_DEFPATH importpath(str2short(_PATH_DEFPATH)); #else /* !_PATH_DEFPATH */ setq(STRpath, defaultpath(), &shvhed, VAR_READWRITE); #endif /* _PATH_DEFPATH */ else /* Importpath() allocates memory for the path, and the * returned pointer from SAVE() was discarded, so * this was a memory leak.. (sg) * * importpath(SAVE(tcp)); */ importpath(str2short(tcp)); { /* If the SHELL environment variable ends with "tcsh", set * STRshell to the same path. This is to facilitate using * the executable in environments where the compiled-in * default isn't appropriate (sg). */ int sh_len = 0; if ((tcp = getenv("SHELL")) != NULL) { sh_len = strlen(tcp); if ((sh_len >= 5 && strcmp(tcp + (sh_len - 5), "/tcsh") == 0) || (sh_len >= 6 && strcmp(tcp + (sh_len - 6), "/qtcsh") == 0) || (!tcsh && sh_len >= 4 && strcmp(tcp + (sh_len - 4), "/csh") == 0)) set(STRshell, quote(SAVE(tcp)), VAR_READWRITE); else sh_len = 0; } if (sh_len == 0) set(STRshell, Strsave(STR_SHELLPATH), VAR_READWRITE); } #ifdef COLOR_LS_F if ((tcp = getenv("LS_COLORS")) != NULL) parseLS_COLORS(str2short(tcp)); #endif /* COLOR_LS_F */ doldol = putn((int) getpid()); /* For $$ */ #ifdef WINNT { char *strtmp1, strtmp2[MAXPATHLEN]; if ((strtmp1 = getenv("TMP")) != NULL) wsprintf(strtmp2, "%s/%s", strtmp1, "sh"); shtemp = Strspl(SAVE(strtmp2), doldol); /* For << */ } #else /* !WINNT */ #ifdef INTERIX shtemp = str2short(tmpnam(NULL)); /* For << */ #else shtemp = Strspl(STRtmpsh, doldol); /* For << */ #endif #endif /* WINNT */ /* * Record the interrupt states from the parent process. If the parent is * non-interruptible our hand must be forced or we (and our children) won't * be either. Our children inherit termination from our parent. We catch it * only if we are the login shell. */ #ifdef BSDSIGS /* * PURIFY-2 claims that osv does not get * initialized after the sigvec call */ setzero((char*) &osv, sizeof(osv)); /* parents interruptibility */ (void) mysigvec(SIGINT, NULL, &osv); parintr = (signalfun_t) osv.sv_handler; (void) mysigvec(SIGTERM, NULL, &osv); parterm = (signalfun_t) osv.sv_handler; #else /* BSDSIGS */ parintr = signal(SIGINT, SIG_IGN); /* parents interruptibility */ (void) sigset(SIGINT, parintr); /* ... restore */ # ifdef COHERENT if (loginsh) /* it seems that SIGTERM is always set to SIG_IGN by */ /* init/getty so it should be set to SIG_DFL - there may be */ /* a better fix for this. */ parterm = SIG_DFL; else # else /* !COHERENT */ parterm = signal(SIGTERM, SIG_IGN); /* parents terminability */ # endif /* COHERENT */ (void) sigset(SIGTERM, parterm); /* ... restore */ #endif /* BSDSIGS */ #ifdef TCF /* Enable process migration on ourselves and our progeny */ (void) signal(SIGMIGRATE, SIG_DFL); #endif /* TCF */ /* * Process the arguments. * * Note that processing of -v/-x is actually delayed till after script * processing. * * We set the first character of our name to be '-' if we are a shell * running interruptible commands. Many programs which examine ps'es * use this to filter such shells out. */ argc--, tempv++; while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { do switch (*tcp++) { case 0: /* - Interruptible, no prompt */ prompt = 0; setintr = 1; nofile = 1; break; case 'b': /* -b Next arg is input file */ batch = 1; break; #ifdef CATCH_EXEC case 'A': /* verbose */ set_sgemode(CATCH_EXEC_MODE_VERBOSE, 1); break; case 'B': /* batch */ set_sgemode(CATCH_EXEC_MODE_IMMEDIATE, 0); break; case 'L': /* local */ set_sgemode(CATCH_EXEC_MODE_REMOTE, 0); set_sgemode(CATCH_EXEC_MODE_FORCE_REMOTE, 0); break; case 'R': /* remote (forced) */ set_sgemode(CATCH_EXEC_MODE_FORCE_REMOTE, 1); break; #endif case 'c': /* -c Command input from arg */ if (argc == 1) xexit(0); argc--, tempv++; #ifdef M_XENIX /* Xenix Vi bug: it relies on a 7 bit environment (/bin/sh), so it pass ascii arguments with the 8th bit set */ if (!strcmp(argv[0], "sh")) { char *p; for (p = tempv[0]; *p; ++p) *p &= ASCII; } #endif arginp = SAVE(tempv[0]); /* * we put the command into a variable */ if (arginp != NULL) set(STRcommand, quote(Strsave(arginp)), VAR_READWRITE); /* * * Give an error on -c arguments that end in * backslash to * ensure that you don't make * nonportable csh scripts. */ { register int count; cp = arginp + Strlen(arginp); count = 0; while (cp > arginp && *--cp == '\\') ++count; if ((count & 1) != 0) { exiterr = 1; stderror(ERR_ARGC); } } prompt = 0; nofile = 1; break; case 'd': /* -d Load directory stack from file */ rdirs = 1; break; #ifdef apollo case 'D': /* -D Define environment variable */ { register Char *dp; cp = str2short(tcp); if (dp = Strchr(cp, '=')) { *dp++ = '\0'; tsetenv(cp, dp); } else tsetenv(cp, STRNULL); } *tcp = '\0'; /* done with this argument */ break; #endif /* apollo */ case 'e': /* -e Exit on any error */ exiterr = 1; break; case 'f': /* -f Fast start */ fast = 1; break; case 'i': /* -i Interactive, even if !intty */ intact = 1; nofile = 1; break; case 'm': /* -m read .cshrc (from su) */ mflag = 1; break; case 'n': /* -n Don't execute */ noexec = 1; break; case 'q': /* -q (Undoc'd) ... die on quit */ quitit = 1; break; case 's': /* -s Read from std input */ nofile = 1; break; case 't': /* -t Read one line from input */ onelflg = 2; prompt = 0; nofile = 1; break; case 'v': /* -v Echo hist expanded input */ nverbose = 1; /* ... later */ break; case 'x': /* -x Echo just before execution */ nexececho = 1; /* ... later */ break; case 'V': /* -V Echo hist expanded input */ setNS(STRverbose); /* NOW! */ break; case 'X': /* -X Echo just before execution */ setNS(STRecho); /* NOW! */ break; case 'F': /* Undocumented flag */ /* * This will cause children to be created using fork instead of * vfork. */ use_fork = 1; break; case ' ': case '\t': /* * for O/S's that don't do the argument parsing right in * "#!/foo -f " scripts */ break; default: /* Unknown command option */ exiterr = 1; stderror(ERR_TCSHUSAGE, tcp-1, progname); break; } while (*tcp); tempv++, argc--; } if (quitit) /* With all due haste, for debugging */ (void) signal(SIGQUIT, SIG_DFL); /* * Unless prevented by -, -c, -i, -s, or -t, if there are remaining * arguments the first of them is the name of a shell file from which to * read commands. */ if (nofile == 0 && argc > 0) { nofile = open(tempv[0], O_RDONLY); if (nofile < 0) { child = 1; /* So this ... */ /* ... doesn't return */ stderror(ERR_SYSTEM, tempv[0], strerror(errno)); } if (ffile != NULL) xfree((ptr_t) ffile); dolzero = 1; ffile = SAVE(tempv[0]); /* * Replace FSHIN. Handle /dev/std{in,out,err} specially * since once they are closed we cannot open them again. * In that case we use our own saved descriptors */ if ((SHIN = dmove(nofile, FSHIN)) < 0) switch(nofile) { case 0: SHIN = FSHIN; break; case 1: SHIN = FSHOUT; break; case 2: SHIN = FSHDIAG; break; default: stderror(ERR_SYSTEM, tempv[0], strerror(errno)); break; } (void) close_on_exec(SHIN, 1); prompt = 0; /* argc not used any more */ tempv++; } /* * Consider input a tty if it really is or we are interactive. but not for * editing (christos) */ if (!(intty = isatty(SHIN))) { if (adrof(STRedit)) unsetv(STRedit); editing = 0; } intty |= intact; #ifndef convex if (intty || (intact && isatty(SHOUT))) { if (!batch && (uid != euid || gid != egid)) { errno = EACCES; child = 1; /* So this ... */ /* ... doesn't return */ stderror(ERR_SYSTEM, progname, strerror(errno)); } } #endif /* convex */ isoutatty = isatty(SHOUT); isdiagatty = isatty(SHDIAG); /* * Decide whether we should play with signals or not. If we are explicitly * told (via -i, or -) or we are a login shell (arg0 starts with -) or the * input and output are both the ttys("csh", or "csh/dev/ttyx") * Note that in only the login shell is it likely that parent may have set * signals to be ignored */ if (loginsh || intact || (intty && isatty(SHOUT))) setintr = 1; settell(); /* * Save the remaining arguments in argv. */ setq(STRargv, blk2short(tempv), &shvhed, VAR_READWRITE); /* * Set up the prompt. */ if (prompt) { if (tcsh) set(STRprompt, Strsave(STRdeftcshprompt), VAR_READWRITE); else set(STRprompt, Strsave(STRdefcshprompt), VAR_READWRITE); /* that's a meta-questionmark */ set(STRprompt2, Strsave(STRmquestion), VAR_READWRITE); set(STRprompt3, Strsave(STRKCORRECT), VAR_READWRITE); } /* * If we are an interactive shell, then start fiddling with the signals; * this is a tricky game. */ shpgrp = mygetpgrp(); opgrp = tpgrp = -1; if (setintr) { signalfun_t osig; **argv = '-'; if (!quitit) /* Wary! */ (void) signal(SIGQUIT, SIG_IGN); (void) sigset(SIGINT, pintr); (void) sighold(SIGINT); (void) signal(SIGTERM, SIG_IGN); /* * No reason I can see not to save history on all these events.. * Most usual occurrence is in a window system, where we're not a login * shell, but might as well be... (sg) * But there might be races when lots of shells exit together... * [this is also incompatible]. * We have to be mre careful here. If the parent wants to * ignore the signals then we leave them untouched... * We also only setup the handlers for shells that are trully * interactive. */ osig = signal(SIGHUP, phup); /* exit processing on HUP */ if (!loginsh && osig == SIG_IGN) (void) signal(SIGHUP, osig); #ifdef SIGXCPU osig = signal(SIGXCPU, phup); /* exit processing on XCPU */ if (!loginsh && osig == SIG_IGN) (void) signal(SIGXCPU, osig); #endif #ifdef SIGXFSZ osig = signal(SIGXFSZ, phup); /* exit processing on XFSZ */ if (!loginsh && osig == SIG_IGN) (void) signal(SIGXFSZ, osig); #endif if (quitit == 0 && arginp == 0) { #ifdef SIGTSTP (void) signal(SIGTSTP, SIG_IGN); #endif #ifdef SIGTTIN (void) signal(SIGTTIN, SIG_IGN); #endif #ifdef SIGTTOU (void) signal(SIGTTOU, SIG_IGN); #endif /* * Wait till in foreground, in case someone stupidly runs csh & * dont want to try to grab away the tty. */ if (isatty(FSHDIAG)) f = FSHDIAG; else if (isatty(FSHOUT)) f = FSHOUT; else if (isatty(OLDSTD)) f = OLDSTD; else f = -1; #ifdef NeXT /* NeXT 2.0 /usr/etc/rlogind, does not set our process group! */ if (shpgrp == 0) { shpgrp = getpid(); (void) setpgid(0, shpgrp); (void) tcsetpgrp(f, shpgrp); } #endif /* NeXT */ #ifdef BSDJOBS /* if we have tty job control */ retry: if ((tpgrp = tcgetpgrp(f)) != -1) { if (tpgrp != shpgrp) { signalfun_t old = signal(SIGTTIN, SIG_DFL); (void) kill(0, SIGTTIN); (void) signal(SIGTTIN, old); goto retry; } /* * Thanks to Matt Day for the POSIX references, and to * Paul Close for the SGI clarification. */ if (setdisc(f) != -1) { opgrp = shpgrp; shpgrp = getpid(); tpgrp = shpgrp; if (tcsetpgrp(f, shpgrp) == -1) { /* * On hpux 7.03 this fails with EPERM. This happens on * the 800 when opgrp != shpgrp at this point. (we were * forked from a non job control shell) * POSIX 7.2.4, says we failed because the process * group specified did not belong to a process * in the same session with the tty. So we set our * process group and try again. */ if (setpgid(0, shpgrp) == -1) { xprintf("setpgid:"); goto notty; } if (tcsetpgrp(f, shpgrp) == -1) { xprintf("tcsetpgrp:"); goto notty; } } /* * We check the process group now. If it is the same, then * we don't need to set it again. On hpux 7.0 on the 300's * if we set it again it fails with EPERM. This is the * correct behavior according to POSIX 4.3.3 if the process * was a session leader . */ else if (shpgrp != mygetpgrp()) { if(setpgid(0, shpgrp) == -1) { xprintf("setpgid:"); goto notty; } } #ifdef IRIS4D /* * But on irix 3.3 we need to set it again, even if it is * the same. We do that to tell the system that we * need BSD process group compatibility. */ else (void) setpgid(0, shpgrp); #endif (void) close_on_exec(dcopy(f, FSHTTY), 1); } else tpgrp = -1; } if (tpgrp == -1) { notty: xprintf(CGETS(11, 1, "Warning: no access to tty (%s).\n"), strerror(errno)); xprintf(CGETS(11, 2, "Thus no job control in this shell.\n")); /* * Fix from:Sakari Jalovaara if we don't * have access to tty, disable editing too */ if (adrof(STRedit)) unsetv(STRedit); editing = 0; } #else /* BSDJOBS */ /* don't have job control, so frotz it */ tpgrp = -1; #endif /* BSDJOBS */ } } if ((setintr == 0) && (parintr == SIG_DFL)) setintr = 1; /* * SVR4 doesn't send a SIGCHLD when a child is stopped or continued if the * handler is installed with signal(2) or sigset(2). sigaction(2) must * be used instead. * * David Dawes (dawes@physics.su.oz.au) Sept 1991 */ #if SYSVREL > 3 { struct sigaction act; act.sa_handler=pchild; (void) sigemptyset(&(act.sa_mask)); /* Don't block any extra sigs * when the handler is called */ act.sa_flags=0; /* want behaviour of sigset() without * SA_NOCLDSTOP */ if ((sigaction(SIGCHLD,&act,(struct sigaction *)NULL)) == -1) stderror(ERR_SYSTEM, "sigaction", strerror(errno)); } #else /* SYSVREL <= 3 */ (void) sigset(SIGCHLD, pchild); /* while signals not ready */ #endif /* SYSVREL <= 3 */ if (intty && !arginp) (void) ed_Setup(editing);/* Get the tty state, and set defaults */ /* Only alter the tty state if editing */ /* * Set an exit here in case of an interrupt or error reading the shell * start-up scripts. */ reenter = setexit(); /* PWP */ haderr = 0; /* In case second time through */ if (!fast && reenter == 0) { /* Will have varval(STRhome) here because set fast if don't */ { int osetintr = setintr; signalfun_t oparintr = parintr; #ifdef BSDSIGS sigmask_t omask = sigblock(sigmask(SIGINT)); #else (void) sighold(SIGINT); #endif setintr = 0; parintr = SIG_IGN; /* onintr in /etc/ files has no effect */ #ifdef LOGINFIRST #ifdef _PATH_DOTLOGIN if (loginsh) (void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL); #endif #endif #ifdef _PATH_DOTCSHRC (void) srcfile(_PATH_DOTCSHRC, 0, 0, NULL); #endif if (!arginp && !onelflg && !havhash) dohash(NULL,NULL); #ifndef LOGINFIRST #ifdef _PATH_DOTLOGIN if (loginsh) (void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL); #endif #endif #ifdef BSDSIGS (void) sigsetmask(omask); #else (void) sigrelse(SIGINT); #endif setintr = osetintr; parintr = oparintr; } #ifdef LOGINFIRST if (loginsh) (void) srccat(varval(STRhome), STRsldotlogin); #endif /* upward compat. */ if (!srccat(varval(STRhome), STRsldottcshrc)) (void) srccat(varval(STRhome), STRsldotcshrc); if (!fast && !arginp && !onelflg && !havhash) dohash(NULL,NULL); /* * Source history before .login so that it is available in .login */ loadhist(NULL, 0); #ifndef LOGINFIRST if (loginsh) (void) srccat(varval(STRhome), STRsldotlogin); #endif if (!fast && (loginsh || rdirs)) loaddirs(NULL); } /* Initing AFTER .cshrc is the Right Way */ if (intty && !arginp) { /* PWP setup stuff */ ed_Init(); /* init the new line editor */ #ifdef SIG_WINDOW check_window_size(1); /* mung environment */ #endif /* SIG_WINDOW */ } /* * dspkanji/dspmbyte autosetting */ /* PATCH IDEA FROM Issei.Suzuki VERY THANKS */ #if defined(DSPMBYTE) if ((tcp = getenv("LANG")) != NULL && !adrof(CHECK_MBYTEVAR)) { autoset_dspmbyte(str2short(tcp)); } #if defined(WINNT) else if (!adrof(CHECK_MBYTEVAR)) nt_autoset_dspmbyte(); #endif /* WINNT */ #endif /* * Now are ready for the -v and -x flags */ if (nverbose) setNS(STRverbose); if (nexececho) setNS(STRecho); /* * Initialize remote execution module */ #ifdef CATCH_EXEC sge_init((print_func_t)xprintf); #endif /* * All the rest of the world is inside this call. The argument to process * indicates whether it should catch "error unwinds". Thus if we are a * interactive shell our call here will never return by being blown past on * an error. */ process(setintr); /* * Mop-up. */ if (intty) { if (loginsh) { xprintf("logout\n"); (void) close(SHIN); child = 1; #ifdef TESLA do_logout = 1; #endif /* TESLA */ goodbye(NULL, NULL); } else { xprintf("exit\n"); } } record(); exitstat(); return (0); } void untty() { #ifdef BSDJOBS if (tpgrp > 0 && opgrp != shpgrp) { (void) setpgid(0, opgrp); (void) tcsetpgrp(FSHTTY, opgrp); (void) resetdisc(FSHTTY); } #endif /* BSDJOBS */ } void importpath(cp) Char *cp; { register int i = 0; register Char *dp; register Char **pv; int c; for (dp = cp; *dp; dp++) if (*dp == PATHSEP) i++; /* * i+2 where i is the number of colons in the path. There are i+1 * directories in the path plus we need room for a zero terminator. */ pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char *)); dp = cp; i = 0; if (*dp) for (;;) { if ((c = *dp) == PATHSEP || c == 0) { *dp = 0; pv[i++] = Strsave(*cp ? cp : STRdot); if (c) { cp = dp + 1; *dp = PATHSEP; } else break; } #ifdef WINNT else if (*dp == '\\') *dp = '/'; #endif /* WINNT */ dp++; } pv[i] = 0; setq(STRpath, pv, &shvhed, VAR_READWRITE); } /* * Source to the file which is the catenation of the argument names. */ static int srccat(cp, dp) Char *cp, *dp; { if (cp[0] == '/' && cp[1] == '\0') return srcfile(short2str(dp), (mflag ? 0 : 1), 0, NULL); else { register Char *ep; char *ptr; int rv; #ifdef WINNT ep = cp; while(*ep) ep++; if (ep[-1] == '/' && dp[0] == '/') /* silly win95 */ dp++; #endif /* WINNT */ ep = Strspl(cp, dp); ptr = short2str(ep); rv = srcfile(ptr, (mflag ? 0 : 1), 0, NULL); xfree((ptr_t) ep); return rv; } } /* * Source to a file putting the file descriptor in a safe place (> 2). */ static int srcfile(f, onlyown, flag, av) char *f; bool onlyown; int flag; Char **av; { register int unit; if ((unit = open(f, O_RDONLY)) == -1) return 0; unit = dmove(unit, -1); (void) close_on_exec(unit, 1); srcunit(unit, onlyown, flag, av); return 1; } /* * Save the shell state, and establish new argument vector, and new input * fd. */ static void st_save(st, unit, hflg, al, av) struct saved_state *st; int unit, hflg; Char **al, **av; { st->insource = insource; st->SHIN = SHIN; st->intty = intty; st->whyles = whyles; st->gointr = gointr; st->arginp = arginp; st->evalp = evalp; st->evalvec = evalvec; st->alvecp = alvecp; st->alvec = alvec; st->onelflg = onelflg; st->enterhist = enterhist; if (hflg) st->HIST = HIST; else st->HIST = '\0'; st->cantell = cantell; cpybin(st->B, B); /* * we can now pass arguments to source. * For compatibility we do that only if arguments were really * passed, otherwise we keep the old, global $argv like before. */ if (av != NULL && *av != NULL) { struct varent *vp; if ((vp = adrof(STRargv)) != NULL) st->argv = saveblk(vp->vec); else st->argv = NULL; setq(STRargv, saveblk(av), &shvhed, VAR_READWRITE); } else st->argv = NULL; SHIN = unit; /* Do this first */ /* Establish new input arena */ { fbuf = NULL; fseekp = feobp = fblocks = 0; settell(); } arginp = 0; onelflg = 0; intty = isatty(SHIN); whyles = 0; gointr = 0; evalvec = 0; evalp = 0; alvec = al; alvecp = 0; enterhist = hflg; if (enterhist) HIST = '\0'; insource = 1; } /* * Restore the shell to a saved state */ static void st_restore(st, av) struct saved_state *st; Char **av; { if (st->SHIN == -1) return; /* Reset input arena */ { register int i; register Char** nfbuf = fbuf; register int nfblocks = fblocks; fblocks = 0; fbuf = NULL; for (i = 0; i < nfblocks; i++) xfree((ptr_t) nfbuf[i]); xfree((ptr_t) nfbuf); } cpybin(B, st->B); (void) close(SHIN); insource = st->insource; SHIN = st->SHIN; arginp = st->arginp; onelflg = st->onelflg; evalp = st->evalp; evalvec = st->evalvec; alvecp = st->alvecp; alvec = st->alvec; intty = st->intty; whyles = st->whyles; gointr = st->gointr; if (st->HIST != '\0') HIST = st->HIST; enterhist = st->enterhist; cantell = st->cantell; if (st->argv != NULL) setq(STRargv, st->argv, &shvhed, VAR_READWRITE); else if (av != NULL && *av != NULL && adrof(STRargv) != NULL) unsetv(STRargv); } /* * Source to a unit. If onlyown it must be our file or our group or * we don't chance it. This occurs on ".cshrc"s and the like. */ static void srcunit(unit, onlyown, hflg, av) register int unit; bool onlyown; int hflg; Char **av; { struct saved_state st; st.SHIN = -1; /* st_restore checks this */ if (unit < 0) return; if (didfds) donefds(); if (onlyown) { struct stat stb; if (fstat(unit, &stb) < 0) { (void) close(unit); return; } } getexit(st.oldexit); if (setintr) #ifdef BSDSIGS st.mask = sigblock(sigmask(SIGINT)); #else (void) sighold(SIGINT); #endif /* Save the current state and move us to a new state */ st_save(&st, unit, hflg, NULL, av); /* * Now if we are allowing commands to be interrupted, we let ourselves be * interrupted. */ if (setintr) #ifdef BSDSIGS (void) sigsetmask(st.mask); #else (void) sigrelse(SIGINT); #endif /* * Bugfix for running out of memory by: Jak Kirman * . Solution: pay attention to what * setexit() is returning because reenter _may_ be in a register, and * thus restored to 0 on a longjump(). (PWP: insert flames about * compiler-dependant code here) PWP: THANKS LOTS !!! * * PWP: think of this as like a LISP (unwind-protect ...) * thanks to Diana Smetters for pointing out how this _should_ be written */ #ifdef cray st.reenter = 1; /* assume non-zero return val */ if (setexit() == 0) { st.reenter = 0; /* Oh well, we were wrong */ #else if ((st.reenter = setexit()) == 0) { #endif process(0); /* 0 -> blow away on errors */ } if (setintr) #ifdef BSDSIGS (void) sigsetmask(st.mask); #else (void) sigrelse(SIGINT); #endif /* Restore the old state */ st_restore(&st, av); resexit(st.oldexit); /* * If process reset() (effectively an unwind) then we must also unwind. */ if (st.reenter) stderror(ERR_SILENT); } /*ARGSUSED*/ void goodbye(v, c) Char **v; struct command *c; { USE(c); record(); if (loginsh) { (void) sigset(SIGQUIT, SIG_IGN); (void) sigset(SIGINT, SIG_IGN); (void) sigset(SIGTERM, SIG_IGN); (void) sigset(SIGHUP, SIG_IGN); setintr = 0; /* No interrupts after "logout" */ /* Trap errors inside .logout */ reenter = setexit(); if (reenter != 0) exitstat(); if (!(adrof(STRlogout))) set(STRlogout, Strsave(STRnormal), VAR_READWRITE); #ifdef _PATH_DOTLOGOUT (void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL); #endif if (adrof(STRhome)) (void) srccat(varval(STRhome), STRsldtlogout); #ifdef TESLA do_logout = 1; #endif /* TESLA */ } exitstat(); } void exitstat() { #ifdef PROF monitor(0); #endif /* * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit * directly because we poke child here. Otherwise we might continue * unwarrantedly (sic). */ child = 1; xexit(getn(varval(STRstatus))); } /* * in the event of a HUP we want to save the history */ static sigret_t phup(snum) int snum; { /* * There is no return from here, * so we are not going to release SIGHUP * anymore */ #ifdef UNRELSIGS if (snum) (void) sigset(snum, SIG_IGN); #else # ifdef BSDSIGS (void) sigblock(sigmask(SIGHUP)); # else (void) sighold(SIGHUP); # endif /* BSDSIGS */ #endif /* UNRELSIGS */ if (loginsh) { set(STRlogout, Strsave(STRhangup), VAR_READWRITE); #ifdef _PATH_DOTLOGOUT (void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL); #endif if (adrof(STRhome)) (void) srccat(varval(STRhome), STRsldtlogout); } record(); #ifdef POSIXJOBS /* * We kill the last foreground process group. It then becomes * responsible to propagate the SIGHUP to its progeny. */ { struct process *pp, *np; for (pp = proclist.p_next; pp; pp = pp->p_next) { np = pp; /* * Find if this job is in the foreground. It could be that * the process leader has exited and the foreground flag * is cleared for it. */ do /* * If a process is in the foreground we try to kill * it's process group. If we succeed, then the * whole job is gone. Otherwise we keep going... * But avoid sending HUP to the shell again. */ if (((np->p_flags & PFOREGND) != 0) && np->p_jobid != shpgrp) { np->p_flags &= ~PHUP; if (killpg(np->p_jobid, SIGHUP) != -1) { /* In case the job was suspended... */ #ifdef SIGCONT (void) killpg(np->p_jobid, SIGCONT); #endif break; } } while ((np = np->p_friends) != pp); } } #endif /* POSIXJOBS */ xexit(snum); #ifndef SIGVOID return (snum); #endif } static Char *jobargv[2] = {STRjobs, 0}; /* * Catch an interrupt, e.g. during lexical input. * If we are an interactive shell, we reset the interrupt catch * immediately. In any case we drain the shell output, * and finally go through the normal error mechanism, which * gets a chance to make the shell go away. */ int just_signaled; /* bugfix by Michael Bloom (mg@ttidca.TTI.COM) */ #ifdef SIGVOID /*ARGSUSED*/ #endif sigret_t pintr(snum) int snum; { #ifdef UNRELSIGS if (snum) (void) sigset(snum, pintr); #endif /* UNRELSIGS */ just_signaled = 1; pintr1(1); #ifndef SIGVOID return (snum); #endif } void pintr1(wantnl) bool wantnl; { register Char **v; #ifdef BSDSIGS sigmask_t omask; #endif #ifdef BSDSIGS omask = sigblock((sigmask_t) 0); #endif if (setintr) { #ifdef BSDSIGS (void) sigsetmask(omask & ~sigmask(SIGINT)); #else (void) sigrelse(SIGINT); #endif if (pjobs) { pjobs = 0; xputchar('\n'); dojobs(jobargv, NULL); stderror(ERR_NAME | ERR_INTR); } } /* MH - handle interrupted completions specially */ { extern int InsideCompletion; if (InsideCompletion) stderror(ERR_SILENT); } /* JV - Make sure we shut off inputl */ { extern Char GettingInput; (void) Cookedmode(); GettingInput = 0; } #ifdef BSDSIGS (void) sigsetmask(omask & ~sigmask(SIGCHLD)); #else if (setintr) (void) sighold(SIGINT); (void) sigrelse(SIGCHLD); #endif drainoline(); #if !defined(_VMS_POSIX) && !defined(WINNT) (void) endpwent(); #endif /* !_VMS_POSIX && !WINNT */ /* * If we have an active "onintr" then we search for the label. Note that if * one does "onintr -" then we shan't be interruptible so we needn't worry * about that here. */ if (gointr) { gotolab(gointr); timflg = 0; if ((v = pargv) != 0) pargv = 0, blkfree(v); if ((v = gargv) != 0) gargv = 0, blkfree(v); reset(); } else if (intty && wantnl) { if (editing) { /* * If we are editing a multi-line input command, and move to * the beginning of the line, we don't want to trash it when * we hit ^C */ PastBottom(); ClearLines(); ClearDisp(); } else { /* xputchar('\n'); *//* Some like this, others don't */ (void) putraw('\r'); (void) putraw('\n'); } } stderror(ERR_SILENT); } /* * Process is the main driving routine for the shell. * It runs all command processing, except for those within { ... } * in expressions (which is run by a routine evalav in sh.exp.c which * is a stripped down process), and `...` evaluation which is run * also by a subset of this code in sh.glob.c in the routine backeval. * * The code here is a little strange because part of it is interruptible * and hence freeing of structures appears to occur when none is necessary * if this is ignored. * * Note that if catch is not set then we will unwind on any error. * If an end-of-file occurs, we return. */ static struct command *savet = NULL; void process(catch) bool catch; { extern char Expand; jmp_buf_t osetexit; /* PWP: This might get nuked my longjmp so don't make it a register var */ struct command *t = savet; savet = NULL; getexit(osetexit); for (;;) { pendjob(); /* This was leaking memory badly, particularly when sourcing * files, etc.. For whatever reason we were arriving here with * allocated pointers still active, and the code was simply * overwriting them. I can't say I fully understand the * control flow here, but according to Purify this particular * leak has been plugged, and I haven't noticed any ill * effects.. (sg) */ if (paraml.next && paraml.next != ¶ml) freelex(¶ml); paraml.next = paraml.prev = ¶ml; paraml.word = STRNULL; (void) setexit(); justpr = enterhist; /* execute if not entering history */ /* * Interruptible during interactive reads */ if (setintr) #ifdef BSDSIGS (void) sigsetmask(sigblock((sigmask_t) 0) & ~sigmask(SIGINT)); #else (void) sigrelse(SIGINT); #endif /* * For the sake of reset() */ freelex(¶ml); if (savet) freesyn(savet), savet = NULL; if (haderr) { if (!catch) { /* unwind */ doneinp = 0; savet = t; resexit(osetexit); reset(); } haderr = 0; /* * Every error is eventually caught here or the shell dies. It is * at this point that we clean up any left-over open files, by * closing all but a fixed number of pre-defined files. Thus * routines don't have to worry about leaving files open due to * deeper errors... they will get closed here. */ closem(); continue; } if (doneinp) { doneinp = 0; break; } if (chkstop) chkstop--; if (neednote) pnote(); if (intty && prompt && evalvec == 0) { just_signaled = 0; mailchk(); /* * Watch for logins/logouts. Next is scheduled commands stored * previously using "sched." Then execute periodic commands. * Following that, the prompt precmd is run. */ #ifndef HAVENOUTMP watch_login(0); #endif /* !HAVENOUTMP */ sched_run(0); period_cmd(); precmd(); /* * If we are at the end of the input buffer then we are going to * read fresh stuff. Otherwise, we are rereading input and don't * need or want to prompt. */ if (fseekp == feobp && aret == F_SEEK) printprompt(0, NULL); flush(); setalarm(1); } if (seterr) { xfree((ptr_t) seterr); seterr = NULL; } /* * Echo not only on VERBOSE, but also with history expansion. If there * is a lexical error then we forego history echo. */ if ((lex(¶ml) && !seterr && intty && !tellwhat && !Expand && !whyles) || adrof(STRverbose)) { haderr = 1; prlex(¶ml); haderr = 0; } (void) alarm(0); /* Autologout OFF */ /* * The parser may lose space if interrupted. */ if (setintr) #ifdef BSDSIGS (void) sigblock(sigmask(SIGINT)); #else (void) sighold(SIGINT); #endif /* * Save input text on the history list if reading in old history, or it * is from the terminal at the top level and not in a loop. * * PWP: entry of items in the history list while in a while loop is done * elsewhere... */ if (enterhist || (catch && intty && !whyles && !tellwhat && !arun)) savehist(¶ml, enterhist > 1); if (Expand && seterr) Expand = 0; /* * Print lexical error messages, except when sourcing history lists. */ if (!enterhist && seterr) stderror(ERR_OLD); /* * If had a history command :p modifier then this is as far as we * should go */ if (justpr) reset(); /* * If had a tellwhat from twenex() then do */ if (tellwhat) { (void) tellmewhat(¶ml, NULL); reset(); } alias(¶ml); #ifdef BSDJOBS /* * If we are interactive, try to continue jobs that we have stopped */ if (prompt) continue_jobs(¶ml); #endif /* BSDJOBS */ /* * Check to see if the user typed "rm * .o" or something */ if (prompt) rmstar(¶ml); /* * Parse the words of the input into a parse tree. */ savet = syntax(paraml.next, ¶ml, 0); if (seterr) stderror(ERR_OLD); postcmd(); /* * Execute the parse tree From: Michael Schroeder * was execute(t, tpgrp); */ execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); /* * Made it! */ freelex(¶ml); freesyn(savet), savet = NULL; #ifdef SIG_WINDOW if (catch && intty && !whyles && !tellwhat) (void) window_change(0); /* for window systems */ #endif /* SIG_WINDOW */ set(STR_, Strsave(InputBuf), VAR_READWRITE | VAR_NOGLOB); } savet = t; resexit(osetexit); } /*ARGSUSED*/ void dosource(t, c) register Char **t; struct command *c; { register Char *f; bool hflg = 0; extern int bequiet; char buf[BUFSIZE]; USE(c); t++; if (*t && eq(*t, STRmh)) { if (*++t == NULL) stderror(ERR_NAME | ERR_HFLAG); hflg++; } else if (*t && eq(*t, STRmm)) { if (*++t == NULL) stderror(ERR_NAME | ERR_MFLAG); hflg = 2; } f = globone(*t++, G_ERROR); (void) strcpy(buf, short2str(f)); xfree((ptr_t) f); if ((!srcfile(buf, 0, hflg, t)) && (!hflg) && (!bequiet)) stderror(ERR_SYSTEM, buf, strerror(errno)); } /* * Check for mail. * If we are a login shell, then we don't want to tell * about any mail file unless its been modified * after the time we started. * This prevents us from telling the user things he already * knows, since the login program insists on saying * "You have mail." */ /* * The AMS version. * This version checks if the file is a directory, and if so, * tells you the number of files in it, otherwise do the old thang. * The magic "+1" in the time calculation is to compensate for * an AFS bug where directory mtimes are set to 1 second in * the future. */ static void mailchk() { register struct varent *v; register Char **vp; time_t t; int intvl, cnt; struct stat stb; bool new; v = adrof(STRmail); if (v == 0) return; (void) time(&t); vp = v->vec; cnt = blklen(vp); intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; if (intvl < 1) intvl = 1; if (chktim + intvl > t) return; for (; *vp; vp++) { char *filename = short2str(*vp); char *mboxdir = filename; if (stat(filename, &stb) < 0) continue; #if defined(BSDTIMES) || defined(_SEQUENT_) new = stb.st_mtime > time0.tv_sec; #else new = stb.st_mtime > time0; #endif if (S_ISDIR(stb.st_mode)) { DIR *mailbox; int mailcount = 0; char tempfilename[MAXPATHLEN]; struct stat stc; xsnprintf(tempfilename, MAXPATHLEN, "%s/new", filename); if (stat(tempfilename, &stc) != -1 && S_ISDIR(stc.st_mode)) { /* * "filename/new" exists and is a directory; you are * using Qmail. */ stb = stc; #if defined(BSDTIMES) || defined(_SEQUENT_) new = stb.st_mtime > time0.tv_sec; #else new = stb.st_mtime > time0; #endif mboxdir = tempfilename; } if (stb.st_mtime <= chktim + 1 || (loginsh && !new)) continue; if ((mailbox = opendir(mboxdir)) == NULL) continue; /* skip . and .. */ if (!readdir(mailbox) || !readdir(mailbox)) continue; while (readdir(mailbox)) mailcount++; if (mailcount == 0) continue; if (cnt == 1) xprintf(CGETS(11, 3, "You have %d mail messages.\n"), mailcount); else xprintf(CGETS(11, 4, "You have %d mail messages in %s.\n"), mailcount, filename); } else { if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || (stb.st_atime <= chktim && stb.st_mtime <= chktim) || (loginsh && !new)) continue; if (cnt == 1) xprintf(CGETS(11, 5, "You have %smail.\n"), new ? CGETS(11, 6, "new ") : ""); else xprintf(CGETS(11, 7, "You have %smail in %s.\n"), new ? CGETS(11, 6, "new ") : "", filename); } } chktim = t; } /* * Extract a home directory from the password file * The argument points to a buffer where the name of the * user whose home directory is sought is currently. * We write the home directory of the user back there. */ int gethdir(home) Char *home; { Char *h; /* * Is it us? */ if (*home == '\0') { if ((h = varval(STRhome)) != STRNULL) { (void) Strcpy(home, h); return 0; } else return 1; } /* * Look in the cache */ if ((h = gettilde(home)) == NULL) return 1; else { (void) Strcpy(home, h); return 0; } } /* * Move the initial descriptors to their eventual * resting places, closing all other units. */ void initdesc() { #ifdef NLS_BUGS #ifdef NLS_CATALOGS (void)catclose(catd); #endif /* NLS_CATALOGS */ #endif /* NLS_BUGS */ didfds = 0; /* 0, 1, 2 aren't set up */ (void) close_on_exec(SHIN = dcopy(0, FSHIN), 1); (void) close_on_exec(SHOUT = dcopy(1, FSHOUT), 1); (void) close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1); (void) close_on_exec(OLDSTD = dcopy(SHIN, FOLDSTD), 1); #ifndef CLOSE_ON_EXEC didcch = 0; /* Havent closed for child */ #endif /* CLOSE_ON_EXEC */ isdiagatty = isatty(SHDIAG); isoutatty = isatty(SHOUT); closem(); #ifdef NLS_BUGS #ifdef NLS_CATALOGS nlsinit(); #endif /* NLS_CATALOGS */ #endif /* NLS_BUGS */ } void #ifdef PROF done(i) #else xexit(i) #endif int i; { #ifdef TESLA if (loginsh && do_logout) { /* this is to send hangup signal to the develcon */ /* we toggle DTR. clear dtr - sleep 1 - set dtr */ /* ioctl will return ENOTTY for pty's but we ignore it */ /* exitstat will run after disconnect */ /* we sleep for 2 seconds to let things happen in */ /* .logout and rechist() */ #ifdef TIOCCDTR (void) sleep(2); (void) ioctl(FSHTTY, TIOCCDTR, NULL); (void) sleep(1); (void) ioctl(FSHTTY, TIOCSDTR, NULL); #endif /* TIOCCDTR */ } #endif /* TESLA */ { struct process *pp, *np; /* Kill all processes marked for hup'ing */ for (pp = proclist.p_next; pp; pp = pp->p_next) { np = pp; do if ((np->p_flags & PHUP) && np->p_jobid != shpgrp) { if (killpg(np->p_jobid, SIGHUP) != -1) { /* In case the job was suspended... */ #ifdef SIGCONT (void) killpg(np->p_jobid, SIGCONT); #endif break; } } while ((np = np->p_friends) != pp); } } untty(); #ifdef NLS_CATALOGS /* * We need to call catclose, because SVR4 leaves symlinks behind otherwise * in the catalog directories. We cannot close on a vforked() child, * because messages will stop working on the parent too. */ if (child == 0) (void) catclose(catd); #endif /* NLS_CATALOGS */ #ifdef WINNT nt_cleanup(); #endif /* WINNT */ _exit(i); } #ifndef _PATH_DEFPATH static Char ** defaultpath() { char *ptr; Char **blk, **blkp; struct stat stb; blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); #ifndef NODOT # ifndef DOTLAST *blkp++ = Strsave(STRdot); # endif #endif #define DIRAPPEND(a) \ if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \ *blkp++ = SAVE(ptr) #ifdef _PATH_LOCAL DIRAPPEND(_PATH_LOCAL); #endif #ifdef _PATH_USRUCB DIRAPPEND(_PATH_USRUCB); #endif #ifdef _PATH_USRBSD DIRAPPEND(_PATH_USRBSD); #endif #ifdef _PATH_BIN DIRAPPEND(_PATH_BIN); #endif #ifdef _PATH_USRBIN DIRAPPEND(_PATH_USRBIN); #endif #undef DIRAPPEND #ifndef NODOT # ifdef DOTLAST *blkp++ = Strsave(STRdot); # endif #endif *blkp = NULL; return (blk); } #endif static void record() { if (!fast) { recdirs(NULL, adrof(STRsavedirs) != NULL); rechist(NULL, adrof(STRsavehist) != NULL); } }