From e3cfc8ce61f788739c66445d903f8beacb40c93d Mon Sep 17 00:00:00 2001 From: rgrimes Date: Thu, 26 May 1994 06:18:55 +0000 Subject: BSD 4.4 Lite bin Sources --- bin/csh/csh.c | 1352 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1352 insertions(+) create mode 100644 bin/csh/csh.c (limited to 'bin/csh/csh.c') diff --git a/bin/csh/csh.c b/bin/csh/csh.c new file mode 100644 index 0000000..8f70d32 --- /dev/null +++ b/bin/csh/csh.c @@ -0,0 +1,1352 @@ +/*- + * Copyright (c) 1980, 1991, 1993 + * 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. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1980, 1991, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)csh.c 8.2 (Berkeley) 10/12/93"; +#endif /* not lint */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#if __STDC__ +# include +#else +# include +#endif + +#include "csh.h" +#include "proc.h" +#include "extern.h" +#include "pathnames.h" + +extern bool MapsAreInited; +extern bool NLSMapsAreInited; + +/* + * C Shell + * + * Bill Joy, UC Berkeley, California, USA + * October 1978, May 1980 + * + * Jim Kulp, IIASA, Laxenburg, Austria + * April 1980 + * + * Christos Zoulas, Cornell University + * June, 1991 + */ + +Char *dumphist[] = {STRhistory, STRmh, 0, 0}; +Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0}; + +int nofile = 0; +bool reenter = 0; +bool nverbose = 0; +bool nexececho = 0; +bool quitit = 0; +bool fast = 0; +bool batch = 0; +bool mflag = 0; +bool prompt = 1; +bool enterhist = 0; +bool tellwhat = 0; + +extern char **environ; + +static int readf __P((void *, char *, int)); +static fpos_t seekf __P((void *, fpos_t, int)); +static int writef __P((void *, const char *, int)); +static int closef __P((void *)); +static int srccat __P((Char *, Char *)); +static int srcfile __P((char *, bool, bool)); +static void phup __P((int)); +static void srcunit __P((int, bool, bool)); +static void mailchk __P((void)); +static Char **defaultpath __P((void)); + +int +main(argc, argv) + int argc; + char **argv; +{ + register Char *cp; + register char *tcp; + register int f; + register char **tempv; + struct sigvec osv; + + cshin = stdin; + cshout = stdout; + csherr = stderr; + + settimes(); /* Immed. estab. timing base */ + + /* + * Initialize non constant strings + */ +#ifdef _PATH_BSHELL + STR_BSHELL = SAVE(_PATH_BSHELL); +#endif +#ifdef _PATH_CSHELL + STR_SHELLPATH = SAVE(_PATH_CSHELL); +#endif + STR_environ = blk2short(environ); + environ = short2blk(STR_environ); /* So that we can free it */ + STR_WORD_CHARS = SAVE(WORD_CHARS); + + HIST = '!'; + HISTSUB = '^'; + word_chars = STR_WORD_CHARS; + + tempv = argv; + if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ + quitit = 1; + uid = getuid(); + gid = getgid(); + euid = geteuid(); + egid = getegid(); + /* + * 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'); + + 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); + + AsciiOnly = 1; +#ifdef NLS + (void) setlocale(LC_ALL, ""); + { + 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 */ + + /* + * 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(); + /* + * XXX: This is to keep programs that use stdio happy. + * what we really want is freunopen() .... + * Closing cshin cshout and csherr (which are really stdin stdout + * and stderr at this point and then reopening them in the same order + * gives us again stdin == cshin stdout == cshout and stderr == csherr. + * If that was not the case builtins like printf that use stdio + * would break. But in any case we could fix that with memcpy and + * a bit of pointer manipulation... + * Fortunately this is not needed under the current implementation + * of stdio. + */ + (void) fclose(cshin); + (void) fclose(cshout); + (void) fclose(csherr); + if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef))) + exit(1); + if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef))) + exit(1); + if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef))) + exit(1); + (void) setvbuf(cshin, NULL, _IOLBF, 0); + (void) setvbuf(cshout, NULL, _IOLBF, 0); + (void) setvbuf(csherr, NULL, _IOLBF, 0); + + /* + * Initialize the shell variables. ARGV and PROMPT are initialized later. + * STATUS is also munged in several places. CHILD is munged when + * forking/waiting + */ + set(STRstatus, Strsave(STR0)); + + if ((tcp = getenv("HOME")) != NULL) + cp = SAVE(tcp); + else + cp = NULL; + + if (cp == NULL) + fast = 1; /* No home -> can't read scripts */ + else + set(STRhome, cp); + dinit(cp); /* dinit thinks that HOME == cwd in a login + * shell */ + /* + * Grab other useful things from the environment. Should we grab + * everything?? + */ + if ((tcp = getenv("LOGNAME")) != NULL || + (tcp = getenv("USER")) != NULL) + set(STRuser, SAVE(tcp)); + if ((tcp = getenv("TERM")) != NULL) + set(STRterm, SAVE(tcp)); + + /* + * Re-initialize path if set in environment + */ + if ((tcp = getenv("PATH")) == NULL) + set1(STRpath, defaultpath(), &shvhed); + else + importpath(SAVE(tcp)); + + set(STRshell, Strsave(STR_SHELLPATH)); + + doldol = putn((int) getpid()); /* For $$ */ + shtemp = Strspl(STRtmpsh, doldol); /* For << */ + + /* + * 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. + */ + /* parents interruptibility */ + (void) sigvec(SIGINT, NULL, &osv); + parintr = (void (*) ()) osv.sv_handler; + (void) sigvec(SIGTERM, NULL, &osv); + parterm = (void (*) ()) osv.sv_handler; + + if (loginsh) { + (void) signal(SIGHUP, phup); /* exit processing on HUP */ + (void) signal(SIGXCPU, phup); /* ...and on XCPU */ + (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ + } + + /* + * 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; + + case 'c': /* -c Command input from arg */ + if (argc == 1) + xexit(0); + argc--, tempv++; + arginp = SAVE(tempv[0]); + prompt = 0; + nofile = 1; + break; + + 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; + + } 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)); + } + 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 = FSHERR; + break; + default: + stderror(ERR_SYSTEM, tempv[0], strerror(errno)); + break; + } + (void) ioctl(SHIN, FIOCLEX, NULL); + prompt = 0; + /* argc not used any more */ tempv++; + } + + intty = isatty(SHIN); + intty |= intact; + if (intty || (intact && isatty(SHOUT))) { + if (!batch && (uid != euid || gid != egid)) { + errno = EACCES; + child = 1; /* So this doesn't return */ + stderror(ERR_SYSTEM, "csh", strerror(errno)); + } + } + /* + * 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); + + /* + * Set up the prompt. + */ + if (prompt) { + set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); + /* that's a meta-questionmark */ + set(STRprompt2, Strsave(STRmquestion)); + } + + /* + * If we are an interactive shell, then start fiddling with the signals; + * this is a tricky game. + */ + shpgrp = getpgrp(); + opgrp = tpgrp = -1; + if (setintr) { + **argv = '-'; + if (!quitit) /* Wary! */ + (void) signal(SIGQUIT, SIG_IGN); + (void) signal(SIGINT, pintr); + (void) sigblock(sigmask(SIGINT)); + (void) signal(SIGTERM, SIG_IGN); + if (quitit == 0 && arginp == 0) { + (void) signal(SIGTSTP, SIG_IGN); + (void) signal(SIGTTIN, SIG_IGN); + (void) signal(SIGTTOU, SIG_IGN); + /* + * Wait till in foreground, in case someone stupidly runs csh & + * dont want to try to grab away the tty. + */ + if (isatty(FSHERR)) + f = FSHERR; + else if (isatty(FSHOUT)) + f = FSHOUT; + else if (isatty(OLDSTD)) + f = OLDSTD; + else + f = -1; + retry: + if ((tpgrp = tcgetpgrp(f)) != -1) { + if (tpgrp != shpgrp) { + sig_t old = signal(SIGTTIN, SIG_DFL); + (void) kill(0, SIGTTIN); + (void) signal(SIGTTIN, old); + goto retry; + } + opgrp = shpgrp; + shpgrp = getpid(); + tpgrp = shpgrp; + /* + * Setpgid will fail if we are a session leader and + * mypid == mypgrp (POSIX 4.3.3) + */ + if (opgrp != shpgrp) + if (setpgid(0, shpgrp) == -1) + goto notty; + /* + * We do that after we set our process group, to make sure + * that the process group belongs to a process in the same + * session as the tty (our process and our group) (POSIX 7.2.4) + */ + if (tcsetpgrp(f, shpgrp) == -1) + goto notty; + (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); + } + if (tpgrp == -1) { +notty: + (void) fprintf(csherr, "Warning: no access to tty (%s).\n", + strerror(errno)); + (void) fprintf(csherr, "Thus no job control in this shell.\n"); + } + } + } + if ((setintr == 0) && (parintr == SIG_DFL)) + setintr = 1; + (void) signal(SIGCHLD, pchild); /* while signals not ready */ + + /* + * 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 value(STRhome) here because set fast if don't */ + { + int osetintr = setintr; + sig_t oparintr = parintr; + sigset_t omask = sigblock(sigmask(SIGINT)); + + setintr = 0; + parintr = SIG_IGN; /* Disable onintr */ +#ifdef _PATH_DOTCSHRC + (void) srcfile(_PATH_DOTCSHRC, 0, 0); +#endif + if (!fast && !arginp && !onelflg) + dohash(NULL, NULL); +#ifdef _PATH_DOTLOGIN + if (loginsh) + (void) srcfile(_PATH_DOTLOGIN, 0, 0); +#endif + (void) sigsetmask(omask); + setintr = osetintr; + parintr = oparintr; + } + (void) srccat(value(STRhome), STRsldotcshrc); + + if (!fast && !arginp && !onelflg && !havhash) + dohash(NULL, NULL); + /* + * Source history before .login so that it is available in .login + */ + if ((cp = value(STRhistfile)) != STRNULL) + loadhist[2] = cp; + dosource(loadhist, NULL); + if (loginsh) + (void) srccat(value(STRhome), STRsldotlogin); + } + + /* + * Now are ready for the -v and -x flags + */ + if (nverbose) + setNS(STRverbose); + if (nexececho) + setNS(STRecho); + + /* + * 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) { + (void) fprintf(cshout, "logout\n"); + (void) close(SHIN); + child = 1; + goodbye(); + } + else { + (void) fprintf(cshout, "exit\n"); + } + } + rechist(); + exitstat(); + return (0); +} + +void +untty() +{ + if (tpgrp > 0) { + (void) setpgid(0, opgrp); + (void) tcsetpgrp(FSHTTY, opgrp); + } +} + +void +importpath(cp) + Char *cp; +{ + register int i = 0; + register Char *dp; + register Char **pv; + int c; + + for (dp = cp; *dp; dp++) + if (*dp == ':') + 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) == ':' || c == 0) { + *dp = 0; + if ((*cp != '/' || *cp == '\0') && (euid == 0 || uid == 0)) + (void) fprintf(csherr, + "Warning: imported path contains relative components\n"); + pv[i++] = Strsave(*cp ? cp : STRdot); + if (c) { + cp = dp + 1; + *dp = ':'; + } + else + break; + } + dp++; + } + pv[i] = 0; + set1(STRpath, pv, &shvhed); +} + +/* + * Source to the file which is the catenation of the argument names. + */ +static int +srccat(cp, dp) + Char *cp, *dp; +{ + register Char *ep = Strspl(cp, dp); + char *ptr = short2str(ep); + + xfree((ptr_t) ep); + return srcfile(ptr, mflag ? 0 : 1, 0); +} + +/* + * Source to a file putting the file descriptor in a safe place (> 2). + */ +static int +srcfile(f, onlyown, flag) + char *f; + bool onlyown, flag; +{ + register int unit; + + if ((unit = open(f, O_RDONLY)) == -1) + return 0; + unit = dmove(unit, -1); + + (void) ioctl(unit, FIOCLEX, NULL); + srcunit(unit, onlyown, flag); + return 1; +} + +/* + * 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. + */ +int insource; +static void +srcunit(unit, onlyown, hflg) + register int unit; + bool onlyown, hflg; +{ + /* We have to push down a lot of state here */ + /* All this could go into a structure */ + int oSHIN = -1, oldintty = intty, oinsource = insource; + struct whyle *oldwhyl = whyles; + Char *ogointr = gointr, *oarginp = arginp; + Char *oevalp = evalp, **oevalvec = evalvec; + int oonelflg = onelflg; + bool oenterhist = enterhist; + char OHIST = HIST; + bool otell = cantell; + + struct Bin saveB; + volatile sigset_t omask; + jmp_buf oldexit; + + /* The (few) real local variables */ + int my_reenter; + + if (unit < 0) + return; + if (didfds) + donefds(); + if (onlyown) { + struct stat stb; + + if (fstat(unit, &stb) < 0) { + (void) close(unit); + return; + } + } + + /* + * There is a critical section here while we are pushing down the input + * stream since we have stuff in different structures. If we weren't + * careful an interrupt could corrupt SHIN's Bin structure and kill the + * shell. + * + * We could avoid the critical region by grouping all the stuff in a single + * structure and pointing at it to move it all at once. This is less + * efficient globally on many variable references however. + */ + insource = 1; + getexit(oldexit); + omask = 0; + + if (setintr) + omask = sigblock(sigmask(SIGINT)); + /* Setup the new values of the state stuff saved above */ + bcopy((char *) &B, (char *) &(saveB), sizeof(B)); + fbuf = NULL; + fseekp = feobp = fblocks = 0; + oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; + intty = isatty(SHIN), whyles = 0, gointr = 0; + evalvec = 0; + evalp = 0; + enterhist = hflg; + if (enterhist) + HIST = '\0'; + + /* + * Now if we are allowing commands to be interrupted, we let ourselves be + * interrupted. + */ + if (setintr) + (void) sigsetmask(omask); + settell(); + + if ((my_reenter = setexit()) == 0) + process(0); /* 0 -> blow away on errors */ + + if (setintr) + (void) sigsetmask(omask); + if (oSHIN >= 0) { + register int i; + + /* We made it to the new state... free up its storage */ + /* This code could get run twice but xfree doesn't care */ + for (i = 0; i < fblocks; i++) + xfree((ptr_t) fbuf[i]); + xfree((ptr_t) fbuf); + + /* Reset input arena */ + bcopy((char *) &(saveB), (char *) &B, sizeof(B)); + + (void) close(SHIN), SHIN = oSHIN; + arginp = oarginp, onelflg = oonelflg; + evalp = oevalp, evalvec = oevalvec; + intty = oldintty, whyles = oldwhyl, gointr = ogointr; + if (enterhist) + HIST = OHIST; + enterhist = oenterhist; + cantell = otell; + } + + resexit(oldexit); + /* + * If process reset() (effectively an unwind) then we must also unwind. + */ + if (my_reenter) + stderror(ERR_SILENT); + insource = oinsource; +} + +void +rechist() +{ + Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile; + int fp, ftmp, oldidfds; + struct varent *shist; + + if (!fast) { + /* + * If $savehist is just set, we use the value of $history + * else we use the value in $savehist + */ + if ((shist = adrof(STRsavehist)) != NULL) { + if (shist->vec[0][0] != '\0') + (void) Strcpy(hbuf, shist->vec[0]); + else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') + (void) Strcpy(hbuf, shist->vec[0]); + else + return; + } + else + return; + + if ((hfile = value(STRhistfile)) == STRNULL) { + hfile = Strcpy(buf, value(STRhome)); + (void) Strcat(buf, STRsldthist); + } + + if ((fp = creat(short2str(hfile), 0600)) == -1) + return; + + oldidfds = didfds; + didfds = 0; + ftmp = SHOUT; + SHOUT = fp; + dumphist[2] = hbuf; + dohist(dumphist, NULL); + SHOUT = ftmp; + (void) close(fp); + didfds = oldidfds; + } +} + +void +goodbye() +{ + rechist(); + + if (loginsh) { + (void) signal(SIGQUIT, SIG_IGN); + (void) signal(SIGINT, SIG_IGN); + (void) signal(SIGTERM, SIG_IGN); + setintr = 0; /* No interrupts after "logout" */ + if (!(adrof(STRlogout))) + set(STRlogout, STRnormal); +#ifdef _PATH_DOTLOGOUT + (void) srcfile(_PATH_DOTLOGOUT, 0, 0); +#endif + if (adrof(STRhome)) + (void) srccat(value(STRhome), STRsldtlogout); + } + exitstat(); +} + +void +exitstat() +{ + Char *s; +#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; + s = value(STRstatus); + xexit(s ? getn(s) : 0); +} + +/* + * in the event of a HUP we want to save the history + */ +static void +phup(sig) +int sig; +{ + rechist(); + + /* + * 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 && + killpg(np->p_jobid, SIGHUP) != -1) { + /* In case the job was suspended... */ + (void) killpg(np->p_jobid, SIGCONT); + break; + } + while ((np = np->p_friends) != pp); + } + } + _exit(sig); +} + +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. + */ +/* ARGSUSED */ +void +pintr(notused) + int notused; +{ + pintr1(1); +} + +void +pintr1(wantnl) + bool wantnl; +{ + Char **v; + sigset_t omask; + + omask = sigblock((sigset_t) 0); + if (setintr) { + (void) sigsetmask(omask & ~sigmask(SIGINT)); + if (pjobs) { + pjobs = 0; + (void) fprintf(cshout, "\n"); + dojobs(jobargv, NULL); + stderror(ERR_NAME | ERR_INTR); + } + } + (void) sigsetmask(omask & ~sigmask(SIGCHLD)); + (void) fpurge(cshout); + (void) endpwent(); + + /* + * 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) != NULL) + pargv = 0, blkfree(v); + if ((v = gargv) != NULL) + gargv = 0, blkfree(v); + reset(); + } + else if (intty && wantnl) { + (void) fputc('\r', cshout); + (void) fputc('\n', cshout); + } + 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; +{ + jmp_buf osetexit; + struct command *t = savet; + + savet = NULL; + getexit(osetexit); + for (;;) { + pendjob(); + paraml.next = paraml.prev = ¶ml; + paraml.word = STRNULL; + (void) setexit(); + justpr = enterhist; /* execute if not entering history */ + + /* + * Interruptible during interactive reads + */ + if (setintr) + (void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT)); + + /* + * For the sake of reset() + */ + freelex(¶ml); + if (savet) + freesyn(savet), savet = NULL; + + if (haderr) { + if (!catch) { + /* unwind */ + doneinp = 0; + resexit(osetexit); + savet = t; + 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) { + mailchk(); + /* + * 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 (aret == F_SEEK && fseekp == feobp) + printprompt(); + (void) fflush(cshout); + } + 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) || adrof(STRverbose)) { + prlex(csherr, ¶ml); + } + + /* + * The parser may lose space if interrupted. + */ + if (setintr) + (void) sigblock(sigmask(SIGINT)); + + /* + * 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)) + savehist(¶ml); + + /* + * 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(); + + alias(¶ml); + + /* + * Parse the words of the input into a parse tree. + */ + savet = syntax(paraml.next, ¶ml, 0); + if (seterr) + stderror(ERR_OLD); + + execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); + + /* + * Made it! + */ + freelex(¶ml); + freesyn((struct command *) savet), savet = NULL; + } + resexit(osetexit); + savet = t; +} + +void +/*ARGSUSED*/ +dosource(v, t) + Char **v; + struct command *t; + +{ + register Char *f; + bool hflg = 0; + Char buf[BUFSIZ]; + + v++; + if (*v && eq(*v, STRmh)) { + if (*++v == NULL) + stderror(ERR_NAME | ERR_HFLAG); + hflg++; + } + (void) Strcpy(buf, *v); + f = globone(buf, G_ERROR); + (void) strcpy((char *) buf, short2str(f)); + xfree((ptr_t) f); + if (!srcfile((char *) buf, 0, hflg) && !hflg) + stderror(ERR_SYSTEM, (char *) 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." + */ +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++) { + if (stat(short2str(*vp), &stb) < 0) + continue; + new = stb.st_mtime > time0.tv_sec; + 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) + (void) fprintf(cshout, "You have %smail.\n", new ? "new " : ""); + else + (void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", + vis_str(*vp)); + } + 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; + struct passwd *pw; + + /* + * Is it us? + */ + if (*home == '\0') { + if ((h = value(STRhome)) != NULL) { + (void) Strcpy(home, h); + return 0; + } + else + return 1; + } + + if ((pw = getpwnam(short2str(home))) != NULL) { + (void) Strcpy(home, str2short(pw->pw_dir)); + return 0; + } + else + return 1; +} + +/* + * When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17 + * We also check if the shell has already changed the decriptor to point to + * 0, 1, 2 when didfds is set. + */ +#define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0)) + +static int +readf(oreo, buf, siz) + void *oreo; + char *buf; + int siz; +{ + return read(DESC(oreo), buf, siz); +} + + +static int +writef(oreo, buf, siz) + void *oreo; + const char *buf; + int siz; +{ + return write(DESC(oreo), buf, siz); +} + +static fpos_t +seekf(oreo, off, whence) + void *oreo; + fpos_t off; + int whence; +{ + return lseek(DESC(oreo), off, whence); +} + + +static int +closef(oreo) + void *oreo; +{ + return close(DESC(oreo)); +} + + +/* + * Print the visible version of a string. + */ +int +vis_fputc(ch, fp) + int ch; + FILE *fp; +{ + char uenc[5]; /* 4 + NULL */ + + if (ch & QUOTE) + return fputc(ch & TRIM, fp); + /* + * XXX: When we are in AsciiOnly we want all characters >= 0200 to + * be encoded, but currently there is no way in vis to do that. + */ + (void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0); + return fputs(uenc, fp); +} + +/* + * Move the initial descriptors to their eventual + * resting places, closin all other units. + */ +void +initdesc() +{ + + didfds = 0; /* 0, 1, 2 aren't set up */ + (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); + (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); + (void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); + (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); + closem(); +} + + +void +#ifdef PROF +done(i) +#else +xexit(i) +#endif + int i; +{ + untty(); + _exit(i); +} + +static Char ** +defaultpath() +{ + char *ptr; + Char **blk, **blkp; + struct stat stb; + + blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); + +#define DIRAPPEND(a) \ + if (stat(ptr = a, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR) \ + *blkp++ = SAVE(ptr) + + DIRAPPEND(_PATH_BIN); + DIRAPPEND(_PATH_USRBIN); + +#undef DIRAPPEND + + if (euid != 0 && uid != 0) + *blkp++ = Strsave(STRdot); + *blkp = NULL; + return (blk); +} + +void +printprompt() +{ + register Char *cp; + + if (!whyles) { + for (cp = value(STRprompt); *cp; cp++) + if (*cp == HIST) + (void) fprintf(cshout, "%d", eventno + 1); + else { + if (*cp == '\\' && cp[1] == HIST) + cp++; + (void) vis_fputc(*cp | QUOTE, cshout); + } + } + else + /* + * Prompt for forward reading loop body content. + */ + (void) fprintf(cshout, "? "); + (void) fflush(cshout); +} -- cgit v1.1