sh.sem.c revision 167465
1167465Smp/* $Header: /p/tcsh/cvsroot/tcsh/sh.sem.c,v 3.78 2006/10/14 17:23:39 christos Exp $ */ 259243Sobrien/* 359243Sobrien * sh.sem.c: I/O redirections and job forking. A touchy issue! 459243Sobrien * Most stuff with builtins is incorrect 559243Sobrien */ 659243Sobrien/*- 759243Sobrien * Copyright (c) 1980, 1991 The Regents of the University of California. 859243Sobrien * All rights reserved. 959243Sobrien * 1059243Sobrien * Redistribution and use in source and binary forms, with or without 1159243Sobrien * modification, are permitted provided that the following conditions 1259243Sobrien * are met: 1359243Sobrien * 1. Redistributions of source code must retain the above copyright 1459243Sobrien * notice, this list of conditions and the following disclaimer. 1559243Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1659243Sobrien * notice, this list of conditions and the following disclaimer in the 1759243Sobrien * documentation and/or other materials provided with the distribution. 18100616Smp * 3. Neither the name of the University nor the names of its contributors 1959243Sobrien * may be used to endorse or promote products derived from this software 2059243Sobrien * without specific prior written permission. 2159243Sobrien * 2259243Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2359243Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2459243Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2559243Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2659243Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2759243Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2859243Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2959243Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3059243Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3159243Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3259243Sobrien * SUCH DAMAGE. 3359243Sobrien */ 3459243Sobrien#include "sh.h" 3559243Sobrien 36167465SmpRCSID("$tcsh: sh.sem.c,v 3.78 2006/10/14 17:23:39 christos Exp $") 3759243Sobrien 3859243Sobrien#include "tc.h" 3959243Sobrien#include "tw.h" 4069408Sache#ifdef WINNT_NATIVE 4159243Sobrien#include "nt.const.h" 4269408Sache#endif /*WINNT_NATIVE*/ 4359243Sobrien 4459243Sobrien#ifdef CLOSE_ON_EXEC 4559243Sobrien# ifndef SUNOS4 4659243Sobrien# ifndef CLEX_DUPS 4759243Sobrien# define CLEX_DUPS 4859243Sobrien# endif /* CLEX_DUPS */ 4959243Sobrien# endif /* !SUNOS4 */ 5059243Sobrien#endif /* CLOSE_ON_EXEC */ 5159243Sobrien 5259243Sobrien#if defined(__sparc__) || defined(sparc) 53145479Smp# if !defined(MACH) && SYSVREL == 0 && !defined(Lynx) && !defined(BSD4_4) && !defined(linux) && !defined(__GNU__) && !defined(__GLIBC__) 5459243Sobrien# include <vfork.h> 55145479Smp# endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !glibc */ 5659243Sobrien#endif /* __sparc__ || sparc */ 5759243Sobrien 5859243Sobrien#ifdef VFORK 59167465Smpstatic void vffree (int); 6059243Sobrien#endif 61167465Smpstatic Char *splicepipe (struct command *, Char *); 62167465Smpstatic void doio (struct command *, int *, int *); 63167465Smpstatic void chkclob (const char *); 6459243Sobrien 6559243Sobrien/* 6659243Sobrien * C shell 6759243Sobrien */ 6859243Sobrien 6959243Sobrien/* 7059243Sobrien * For SVR4, there are problems with pipelines having the first process as 7159243Sobrien * the group leader. The problem occurs when the first process exits before 7259243Sobrien * the others have a chance to setpgid(). This is because in SVR4 you can't 7359243Sobrien * have a zombie as a group leader. The solution I have used is to reverse 7459243Sobrien * the order in which pipelines are started, making the last process the 7559243Sobrien * group leader. (Note I am not using 'pipeline' in the generic sense -- I 7659243Sobrien * mean processes connected by '|'.) I don't know yet if this causes other 7759243Sobrien * problems. 7859243Sobrien * 7959243Sobrien * All the changes for this are in execute(), and are enclosed in 8059243Sobrien * '#ifdef BACKPIPE' 8159243Sobrien * 8259243Sobrien * David Dawes (dawes@physics.su.oz.au) Oct 1991 8359243Sobrien */ 8459243Sobrien 8559243Sobrien/*VARARGS 1*/ 8659243Sobrienvoid 87167465Smpexecute(struct command *t, volatile int wanttty, int *pipein, int *pipeout, 88167465Smp int do_glob) 8959243Sobrien{ 90145479Smp int forked = 0; 91167465Smp const struct biltins * volatile bifunc; 92167465Smp pid_t pid = 0; 9359243Sobrien int pv[2]; 94167465Smp sigset_t set; 95167465Smp static sigset_t csigset; 9659243Sobrien#ifdef VFORK 9759243Sobrien static int onosigchld = 0; 9859243Sobrien#endif /* VFORK */ 9959243Sobrien static int nosigchld = 0; 10059243Sobrien 10159243Sobrien (void) &wanttty; 10259243Sobrien (void) &forked; 10359243Sobrien (void) &bifunc; 10459243Sobrien 10559243Sobrien if (t == 0) 10659243Sobrien return; 10759243Sobrien 10869408Sache#ifdef WINNT_NATIVE 10959243Sobrien { 11059243Sobrien if ((varval(STRNTslowexec) == STRNULL) && 11159243Sobrien !t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds && 11259243Sobrien (intty || intact) && (t->t_dtyp == NODE_COMMAND) && 11359243Sobrien !isbfunc(t)) { 11459243Sobrien if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE) 11559243Sobrien (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1); 11659243Sobrien Dfix(t); 11759243Sobrien if (nt_try_fast_exec(t) == 0) 11859243Sobrien return; 11959243Sobrien } 12059243Sobrien } 12169408Sache#endif /* WINNT_NATIVE */ 12259243Sobrien 12359243Sobrien /* 12459243Sobrien * Ed hutchins@sgi.com & Dominic dbg@sgi.com 12559243Sobrien * Sat Feb 25 03:13:11 PST 1995 12659243Sobrien * try implicit cd if we have a 1 word command 12759243Sobrien */ 12859243Sobrien if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] && 12959243Sobrien t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) { 130167465Smp Char *sCName; 13159243Sobrien struct stat stbuf; 13259243Sobrien char *pathname; 13359243Sobrien 134167465Smp sCName = dollar(t->t_dcom[0]); 135167465Smp if (sCName != NULL && sCName[0] == '~') { 136167465Smp struct Strbuf buf = Strbuf_INIT; 137167465Smp const Char *name_end; 13859243Sobrien 139167465Smp for (name_end = sCName + 1; *name_end != '\0' && *name_end != '/'; 140167465Smp name_end++) 141167465Smp continue; 142167465Smp if (name_end != sCName + 1) { 143167465Smp Char *name, *home; 144167465Smp 145167465Smp name = Strnsave(sCName + 1, name_end - (sCName + 1)); 146167465Smp home = gethdir(name); 147167465Smp if (home != NULL) { 148167465Smp Strbuf_append(&buf, home); 149167465Smp xfree(home); 150167465Smp } else 151167465Smp Strbuf_append(&buf, name); 152167465Smp xfree(name); 153167465Smp } else 154167465Smp Strbuf_append(&buf, varval(STRhome)); 155167465Smp Strbuf_append(&buf, name_end); 156167465Smp xfree(sCName); 157167465Smp sCName = Strbuf_finish(&buf); 15859243Sobrien } 159167465Smp 16059243Sobrien pathname = short2str(sCName); 161167465Smp xfree(sCName); 16259243Sobrien /* if this is a dir, tack a "cd" on as the first arg */ 163167465Smp if (pathname != NULL && 164167465Smp ((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode)) 16569408Sache#ifdef WINNT_NATIVE 166167465Smp || (pathname[0] && pathname[1] == ':' && pathname[2] == '\0') 16769408Sache#endif /* WINNT_NATIVE */ 168167465Smp )) { 16959243Sobrien Char *vCD[2]; 17059243Sobrien Char **ot_dcom = t->t_dcom; 17159243Sobrien 17259243Sobrien vCD[0] = Strsave(STRcd); 17359243Sobrien vCD[1] = NULL; 17459243Sobrien t->t_dcom = blkspl(vCD, ot_dcom); 175167465Smp xfree(ot_dcom); 17659243Sobrien if (implicit_cd > 1) { 17759243Sobrien blkpr(t->t_dcom); 17859243Sobrien xputchar( '\n' ); 17959243Sobrien } 18059243Sobrien } 18159243Sobrien } 18259243Sobrien 18359243Sobrien /* 18459243Sobrien * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de> 18559243Sobrien * Don't check for wantty > 0... 18659243Sobrien */ 18759243Sobrien if (t->t_dflg & F_AMPERSAND) 18859243Sobrien wanttty = 0; 18959243Sobrien switch (t->t_dtyp) { 19059243Sobrien 19159243Sobrien case NODE_COMMAND: 19259243Sobrien if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE) 193167465Smp memmove(t->t_dcom[0], t->t_dcom[0] + 1, 194167465Smp (Strlen(t->t_dcom[0] + 1) + 1) * sizeof (*t->t_dcom[0])); 19559243Sobrien if ((t->t_dflg & F_REPEAT) == 0) 19659243Sobrien Dfix(t); /* $ " ' \ */ 19759243Sobrien if (t->t_dcom[0] == 0) { 19859243Sobrien return; 19959243Sobrien } 20059243Sobrien /*FALLTHROUGH*/ 20159243Sobrien 20259243Sobrien case NODE_PAREN: 20359243Sobrien#ifdef BACKPIPE 20459243Sobrien if (t->t_dflg & F_PIPEIN) 20559243Sobrien mypipe(pipein); 20659243Sobrien#else /* !BACKPIPE */ 20759243Sobrien if (t->t_dflg & F_PIPEOUT) 20859243Sobrien mypipe(pipeout); 20959243Sobrien#endif /* BACKPIPE */ 21059243Sobrien /* 21159243Sobrien * Must do << early so parent will know where input pointer should be. 21259243Sobrien * If noexec then this is all we do. 21359243Sobrien */ 21459243Sobrien if (t->t_dflg & F_READ) { 215167465Smp xclose(0); 21659243Sobrien heredoc(t->t_dlef); 21759243Sobrien if (noexec) 218167465Smp xclose(0); 21959243Sobrien } 22059243Sobrien 221167465Smp setcopy(STRstatus, STR0, VAR_READWRITE); 22259243Sobrien 22359243Sobrien /* 22459243Sobrien * This mess is the necessary kludge to handle the prefix builtins: 22559243Sobrien * nice, nohup, time. These commands can also be used by themselves, 22659243Sobrien * and this is not handled here. This will also work when loops are 22759243Sobrien * parsed. 22859243Sobrien */ 22959243Sobrien while (t->t_dtyp == NODE_COMMAND) 23059243Sobrien if (eq(t->t_dcom[0], STRnice)) { 23159243Sobrien if (t->t_dcom[1]) { 23259243Sobrien if (strchr("+-", t->t_dcom[1][0])) { 23359243Sobrien if (t->t_dcom[2]) { 23459243Sobrien setname("nice"); 23559243Sobrien t->t_nice = 23659243Sobrien getn(t->t_dcom[1]); 23759243Sobrien lshift(t->t_dcom, 2); 23859243Sobrien t->t_dflg |= F_NICE; 23959243Sobrien } 24059243Sobrien else 24159243Sobrien break; 24259243Sobrien } 24359243Sobrien else { 24459243Sobrien t->t_nice = 4; 24559243Sobrien lshift(t->t_dcom, 1); 24659243Sobrien t->t_dflg |= F_NICE; 24759243Sobrien } 24859243Sobrien } 24959243Sobrien else 25059243Sobrien break; 25159243Sobrien } 25259243Sobrien else if (eq(t->t_dcom[0], STRnohup)) { 25359243Sobrien if (t->t_dcom[1]) { 25459243Sobrien t->t_dflg |= F_NOHUP; 25559243Sobrien lshift(t->t_dcom, 1); 25659243Sobrien } 25759243Sobrien else 25859243Sobrien break; 25959243Sobrien } 26059243Sobrien else if (eq(t->t_dcom[0], STRhup)) { 26159243Sobrien if (t->t_dcom[1]) { 26259243Sobrien t->t_dflg |= F_HUP; 26359243Sobrien lshift(t->t_dcom, 1); 26459243Sobrien } 26559243Sobrien else 26659243Sobrien break; 26759243Sobrien } 26859243Sobrien else if (eq(t->t_dcom[0], STRtime)) { 26959243Sobrien if (t->t_dcom[1]) { 27059243Sobrien t->t_dflg |= F_TIME; 27159243Sobrien lshift(t->t_dcom, 1); 27259243Sobrien } 27359243Sobrien else 27459243Sobrien break; 27559243Sobrien } 27659243Sobrien#ifdef F_VER 27759243Sobrien else if (eq(t->t_dcom[0], STRver)) 27859243Sobrien if (t->t_dcom[1] && t->t_dcom[2]) { 27959243Sobrien setname("ver"); 28059243Sobrien t->t_systype = getv(t->t_dcom[1]); 28159243Sobrien lshift(t->t_dcom, 2); 28259243Sobrien t->t_dflg |= F_VER; 28359243Sobrien } 28459243Sobrien else 28559243Sobrien break; 28659243Sobrien#endif /* F_VER */ 28759243Sobrien else 28859243Sobrien break; 28959243Sobrien 29059243Sobrien /* is it a command */ 29159243Sobrien if (t->t_dtyp == NODE_COMMAND) { 29259243Sobrien /* 29359243Sobrien * Check if we have a builtin function and remember which one. 29459243Sobrien */ 29559243Sobrien bifunc = isbfunc(t); 296167465Smp if (noexec) { 29759243Sobrien /* 29859243Sobrien * Continue for builtins that are part of the scripting language 29959243Sobrien */ 300167465Smp if (bifunc == NULL) 301167465Smp break; 30259243Sobrien if (bifunc->bfunct != (bfunc_t)dobreak && 30359243Sobrien bifunc->bfunct != (bfunc_t)docontin && 30459243Sobrien bifunc->bfunct != (bfunc_t)doelse && 30559243Sobrien bifunc->bfunct != (bfunc_t)doend && 30659243Sobrien bifunc->bfunct != (bfunc_t)doforeach&& 30759243Sobrien bifunc->bfunct != (bfunc_t)dogoto && 30859243Sobrien bifunc->bfunct != (bfunc_t)doif && 30959243Sobrien bifunc->bfunct != (bfunc_t)dorepeat && 31059243Sobrien bifunc->bfunct != (bfunc_t)doswbrk && 31159243Sobrien bifunc->bfunct != (bfunc_t)doswitch && 31259243Sobrien bifunc->bfunct != (bfunc_t)dowhile && 31359243Sobrien bifunc->bfunct != (bfunc_t)dozip) 31459243Sobrien break; 31559243Sobrien } 31659243Sobrien } 31759243Sobrien else { /* not a command */ 31859243Sobrien bifunc = NULL; 31959243Sobrien if (noexec) 32059243Sobrien break; 32159243Sobrien } 32259243Sobrien 32383098Smp /* 32483098Smp * GrP Executing a command - run jobcmd hook 32583098Smp * Don't run for builtins 32683098Smp * Don't run if we're not in a tty 32783098Smp * Don't run if we're not really executing 32883098Smp */ 32983098Smp if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty) { 33083098Smp Char *cmd = unparse(t); 331167465Smp 332167465Smp cleanup_push(cmd, xfree); 33383098Smp job_cmd(cmd); 334167465Smp cleanup_until(cmd); 33583098Smp } 33683098Smp 33759243Sobrien /* 33859243Sobrien * We fork only if we are timed, or are not the end of a parenthesized 33959243Sobrien * list and not a simple builtin function. Simple meaning one that is 34059243Sobrien * not pipedout, niced, nohupped, or &'d. It would be nice(?) to not 34159243Sobrien * fork in some of these cases. 34259243Sobrien */ 34359243Sobrien /* 34459243Sobrien * Prevent forking cd, pushd, popd, chdir cause this will cause the 34559243Sobrien * shell not to change dir! 34659243Sobrien */ 34759243Sobrien#ifdef BACKPIPE 34859243Sobrien /* 34959243Sobrien * Can't have NOFORK for the tail of a pipe - because it is not the 35059243Sobrien * last command spawned (even if it is at the end of a parenthesised 35159243Sobrien * list). 35259243Sobrien */ 35359243Sobrien if (t->t_dflg & F_PIPEIN) 35459243Sobrien t->t_dflg &= ~(F_NOFORK); 35559243Sobrien#endif /* BACKPIPE */ 35659243Sobrien if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd || 35759243Sobrien bifunc->bfunct == (bfunc_t)dopushd || 35859243Sobrien bifunc->bfunct == (bfunc_t)dopopd)) 35959243Sobrien t->t_dflg &= ~(F_NICE); 36059243Sobrien if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 && 36159243Sobrien (!bifunc || t->t_dflg & 36259243Sobrien (F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) || 36359243Sobrien /* 36459243Sobrien * We have to fork for eval too. 36559243Sobrien */ 36659243Sobrien (bifunc && (t->t_dflg & F_PIPEIN) != 0 && 36769408Sache bifunc->bfunct == (bfunc_t)doeval)) { 36859243Sobrien#ifdef VFORK 36959243Sobrien if (t->t_dtyp == NODE_PAREN || 37059243Sobrien t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc) 37159243Sobrien#endif /* VFORK */ 37259243Sobrien { 37359243Sobrien forked++; 37459243Sobrien /* 37559243Sobrien * We need to block SIGCHLD here, so that if the process does 37659243Sobrien * not die before we can set the process group 37759243Sobrien */ 37859243Sobrien if (wanttty >= 0 && !nosigchld) { 379167465Smp sigemptyset(&set); 380167465Smp sigaddset(&set, SIGCHLD); 381167465Smp (void)sigprocmask(SIG_BLOCK, &set, &csigset); 38259243Sobrien 38359243Sobrien nosigchld = 1; 38459243Sobrien } 38559243Sobrien 38659243Sobrien pid = pfork(t, wanttty); 38759243Sobrien if (pid == 0 && nosigchld) { 388167465Smp sigprocmask(SIG_SETMASK, &csigset, NULL); 38959243Sobrien nosigchld = 0; 39059243Sobrien } 39159243Sobrien else if (pid != 0 && (t->t_dflg & F_AMPERSAND)) 39259243Sobrien backpid = pid; 39359243Sobrien } 39459243Sobrien 39559243Sobrien#ifdef VFORK 39659243Sobrien else { 39759243Sobrien int ochild, osetintr, ohaderr, odidfds; 39859243Sobrien int oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp; 39959243Sobrien int oisoutatty, oisdiagatty; 400167465Smp sigset_t oset, ocsigset; 40159243Sobrien# ifndef CLOSE_ON_EXEC 40259243Sobrien int odidcch; 40359243Sobrien# endif /* !CLOSE_ON_EXEC */ 40459243Sobrien 40559243Sobrien /* 40659243Sobrien * Prepare for the vfork by saving everything that the child 40759243Sobrien * corrupts before it exec's. Note that in some signal 40859243Sobrien * implementations which keep the signal info in user space 40959243Sobrien * (e.g. Sun's) it will also be necessary to save and restore 41059243Sobrien * the current sigvec's for the signals the child touches 41159243Sobrien * before it exec's. 41259243Sobrien */ 41359243Sobrien 41459243Sobrien /* 41559243Sobrien * Sooooo true... If this is a Sun, save the sigvec's. (Skip 41659243Sobrien * Gilbrech - 11/22/87) 41759243Sobrien */ 41859243Sobrien# ifdef SAVESIGVEC 419167465Smp struct sigaction savesv[NSIGSAVED]; 420167465Smp sigset_t savesm; 42159243Sobrien 42259243Sobrien# endif /* SAVESIGVEC */ 42359243Sobrien if (wanttty >= 0 && !nosigchld && !noexec) { 424167465Smp sigemptyset(&set); 425167465Smp sigaddset(&set, SIGCHLD); 426167465Smp (void)sigprocmask(SIG_BLOCK, &set, &csigset); 42759243Sobrien nosigchld = 1; 42859243Sobrien } 429167465Smp sigemptyset(&set); 430167465Smp sigaddset(&set, SIGCHLD); 431167465Smp sigaddset(&set, SIGINT); 432167465Smp (void)sigprocmask(SIG_BLOCK, &set, &oset); 43359243Sobrien ochild = child; 43459243Sobrien osetintr = setintr; 43559243Sobrien ohaderr = haderr; 43659243Sobrien odidfds = didfds; 43759243Sobrien# ifndef CLOSE_ON_EXEC 43859243Sobrien odidcch = didcch; 43959243Sobrien# endif /* !CLOSE_ON_EXEC */ 44059243Sobrien oSHIN = SHIN; 44159243Sobrien oSHOUT = SHOUT; 44259243Sobrien oSHDIAG = SHDIAG; 44359243Sobrien oOLDSTD = OLDSTD; 44459243Sobrien otpgrp = tpgrp; 44559243Sobrien oisoutatty = isoutatty; 44659243Sobrien oisdiagatty = isdiagatty; 447167465Smp ocsigset = csigset; 44859243Sobrien onosigchld = nosigchld; 44959243Sobrien Vsav = Vdp = 0; 45059243Sobrien Vexpath = 0; 45159243Sobrien Vt = 0; 45259243Sobrien# ifdef SAVESIGVEC 453167465Smp savesigvec(savesv, savesm); 45459243Sobrien# endif /* SAVESIGVEC */ 45559243Sobrien if (use_fork) 45659243Sobrien pid = fork(); 45759243Sobrien else 45859243Sobrien pid = vfork(); 45959243Sobrien 46059243Sobrien if (pid < 0) { 461167465Smp# ifdef SAVESIGVEC 46259243Sobrien restoresigvec(savesv, savesm); 463167465Smp# endif /* SAVESIGVEC */ 464167465Smp sigprocmask(SIG_SETMASK, &oset, NULL); 46559243Sobrien stderror(ERR_NOPROC); 46659243Sobrien } 46759243Sobrien forked++; 46859243Sobrien if (pid) { /* parent */ 46959243Sobrien# ifdef SAVESIGVEC 47059243Sobrien restoresigvec(savesv, savesm); 47159243Sobrien# endif /* SAVESIGVEC */ 47259243Sobrien child = ochild; 47359243Sobrien setintr = osetintr; 47459243Sobrien haderr = ohaderr; 47559243Sobrien didfds = odidfds; 47659243Sobrien SHIN = oSHIN; 47759243Sobrien# ifndef CLOSE_ON_EXEC 47859243Sobrien didcch = odidcch; 47959243Sobrien# endif /* !CLOSE_ON_EXEC */ 48059243Sobrien SHOUT = oSHOUT; 48159243Sobrien SHDIAG = oSHDIAG; 48259243Sobrien OLDSTD = oOLDSTD; 48359243Sobrien tpgrp = otpgrp; 48459243Sobrien isoutatty = oisoutatty; 48559243Sobrien isdiagatty = oisdiagatty; 486167465Smp csigset = ocsigset; 48759243Sobrien nosigchld = onosigchld; 48859243Sobrien 489167465Smp xfree(Vsav); 49059243Sobrien Vsav = 0; 491167465Smp xfree(Vdp); 49259243Sobrien Vdp = 0; 493167465Smp xfree(Vexpath); 49459243Sobrien Vexpath = 0; 495167465Smp blk_cleanup(Vt); 49659243Sobrien Vt = 0; 49759243Sobrien /* this is from pfork() */ 49859243Sobrien palloc(pid, t); 499167465Smp sigprocmask(SIG_SETMASK, &oset, NULL); 50059243Sobrien } 50159243Sobrien else { /* child */ 50259243Sobrien /* this is from pfork() */ 503167465Smp pid_t pgrp; 504145479Smp int ignint = 0; 50559243Sobrien if (nosigchld) { 506167465Smp sigprocmask(SIG_SETMASK, &csigset, NULL); 50759243Sobrien nosigchld = 0; 50859243Sobrien } 50959243Sobrien 51059243Sobrien if (setintr) 51159243Sobrien ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) 51259243Sobrien || (gointr && eq(gointr, STRminus)); 51359243Sobrien pgrp = pcurrjob ? pcurrjob->p_jobid : getpid(); 51459243Sobrien child++; 51559243Sobrien if (setintr) { 51659243Sobrien setintr = 0; 51759243Sobrien/* 51859243Sobrien * casts made right for SunOS 4.0 by Douglas C. Schmidt 51959243Sobrien * <schmidt%sunshine.ics.uci.edu@ROME.ICS.UCI.EDU> 52059243Sobrien * (thanks! -- PWP) 52159243Sobrien * 52259243Sobrien * ignint ifs cleaned by Johan Widen <mcvax!osiris.sics.se!jw@uunet.UU.NET> 52359243Sobrien * (thanks again) 52459243Sobrien */ 52559243Sobrien if (ignint) { 52659243Sobrien (void) signal(SIGINT, SIG_IGN); 52759243Sobrien (void) signal(SIGQUIT, SIG_IGN); 52859243Sobrien } 52959243Sobrien else { 530167465Smp (void) signal(SIGINT, vffree); 53159243Sobrien (void) signal(SIGQUIT, SIG_DFL); 53259243Sobrien } 53359243Sobrien# ifdef BSDJOBS 53459243Sobrien if (wanttty >= 0) { 53559243Sobrien (void) signal(SIGTSTP, SIG_DFL); 53659243Sobrien (void) signal(SIGTTIN, SIG_DFL); 53759243Sobrien (void) signal(SIGTTOU, SIG_DFL); 53859243Sobrien } 53959243Sobrien# endif /* BSDJOBS */ 54059243Sobrien 541167465Smp sigaction(SIGTERM, &parterm, NULL); 54259243Sobrien } 54359243Sobrien else if (tpgrp == -1 && 54459243Sobrien (t->t_dflg & F_NOINTERRUPT)) { 54559243Sobrien (void) signal(SIGINT, SIG_IGN); 54659243Sobrien (void) signal(SIGQUIT, SIG_IGN); 54759243Sobrien } 54859243Sobrien 54959243Sobrien pgetty(wanttty, pgrp); 55059243Sobrien 55159243Sobrien if (t->t_dflg & F_NOHUP) 55259243Sobrien (void) signal(SIGHUP, SIG_IGN); 55359243Sobrien if (t->t_dflg & F_HUP) 55459243Sobrien (void) signal(SIGHUP, SIG_DFL); 55559243Sobrien if (t->t_dflg & F_NICE) { 55659243Sobrien int nval = SIGN_EXTEND_CHAR(t->t_nice); 557145479Smp# ifdef HAVE_SETPRIORITY 55883098Smp if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno) 55983098Smp stderror(ERR_SYSTEM, "setpriority", 56083098Smp strerror(errno)); 561145479Smp# else /* !HAVE_SETPRIORITY */ 56259243Sobrien (void) nice(nval); 563145479Smp# endif /* HAVE_SETPRIORITY */ 56459243Sobrien } 56559243Sobrien# ifdef F_VER 56659243Sobrien if (t->t_dflg & F_VER) { 56759243Sobrien tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53); 56859243Sobrien dohash(NULL, NULL); 56959243Sobrien } 57059243Sobrien# endif /* F_VER */ 57159243Sobrien } 57259243Sobrien 57359243Sobrien } 57459243Sobrien#endif /* VFORK */ 57569408Sache } 57659243Sobrien if (pid != 0) { 57759243Sobrien /* 57859243Sobrien * It would be better if we could wait for the whole job when we 57959243Sobrien * knew the last process had been started. Pwait, in fact, does 58059243Sobrien * wait for the whole job anyway, but this test doesn't really 58159243Sobrien * express our intentions. 58259243Sobrien */ 58359243Sobrien#ifdef BACKPIPE 58459243Sobrien if (didfds == 0 && t->t_dflg & F_PIPEOUT) { 585167465Smp xclose(pipeout[0]); 586167465Smp xclose(pipeout[1]); 58759243Sobrien } 58859243Sobrien if ((t->t_dflg & F_PIPEIN) != 0) 58959243Sobrien break; 59059243Sobrien#else /* !BACKPIPE */ 59159243Sobrien if (didfds == 0 && t->t_dflg & F_PIPEIN) { 592167465Smp xclose(pipein[0]); 593167465Smp xclose(pipein[1]); 59459243Sobrien } 59559243Sobrien if ((t->t_dflg & F_PIPEOUT) != 0) 59659243Sobrien break; 59759243Sobrien#endif /* BACKPIPE */ 59859243Sobrien 59959243Sobrien if (nosigchld) { 600167465Smp sigprocmask(SIG_SETMASK, &csigset, NULL); 60159243Sobrien nosigchld = 0; 60259243Sobrien } 60359243Sobrien if ((t->t_dflg & F_AMPERSAND) == 0) 60459243Sobrien pwait(); 60559243Sobrien break; 60659243Sobrien } 60759243Sobrien 60859243Sobrien doio(t, pipein, pipeout); 60959243Sobrien#ifdef BACKPIPE 61059243Sobrien if (t->t_dflg & F_PIPEIN) { 611167465Smp xclose(pipein[0]); 612167465Smp xclose(pipein[1]); 61359243Sobrien } 61459243Sobrien#else /* !BACKPIPE */ 61559243Sobrien if (t->t_dflg & F_PIPEOUT) { 616167465Smp xclose(pipeout[0]); 617167465Smp xclose(pipeout[1]); 61859243Sobrien } 61959243Sobrien#endif /* BACKPIPE */ 62059243Sobrien /* 62159243Sobrien * Perform a builtin function. If we are not forked, arrange for 62259243Sobrien * possible stopping 62359243Sobrien */ 62459243Sobrien if (bifunc) { 62559243Sobrien func(t, bifunc); 62659243Sobrien if (forked) 62759243Sobrien exitstat(); 628145479Smp else { 629145479Smp if (adrof(STRprintexitvalue)) { 630145479Smp int rv = getn(varval(STRstatus)); 631145479Smp if (rv != 0) 632145479Smp xprintf(CGETS(17, 2, "Exit %d\n"), rv); 633145479Smp } 634145479Smp } 63559243Sobrien break; 63659243Sobrien } 63759243Sobrien if (t->t_dtyp != NODE_PAREN) { 638100616Smp doexec(t, do_glob); 63959243Sobrien /* NOTREACHED */ 64059243Sobrien } 64159243Sobrien /* 64259243Sobrien * For () commands must put new 0,1,2 in FSH* and recurse 64359243Sobrien */ 644145479Smp (void)close_on_exec(OLDSTD = dcopy(0, FOLDSTD), 1); 645145479Smp (void)close_on_exec(SHOUT = dcopy(1, FSHOUT), 1); 64659243Sobrien isoutatty = isatty(SHOUT); 647145479Smp (void)close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1); 64859243Sobrien isdiagatty = isatty(SHDIAG); 649167465Smp xclose(SHIN); 65059243Sobrien SHIN = -1; 65159243Sobrien#ifndef CLOSE_ON_EXEC 65259243Sobrien didcch = 0; 653145479Smp#else 654145479Smp (void) close_on_exec(FSHOUT, 1); 655145479Smp (void) close_on_exec(FSHDIAG, 1); 656145479Smp (void) close_on_exec(FOLDSTD, 1); 65759243Sobrien#endif /* !CLOSE_ON_EXEC */ 65859243Sobrien didfds = 0; 65959243Sobrien wanttty = -1; 66059243Sobrien t->t_dspr->t_dflg |= t->t_dflg & F_NOINTERRUPT; 661100616Smp execute(t->t_dspr, wanttty, NULL, NULL, do_glob); 66259243Sobrien exitstat(); 66359243Sobrien 66459243Sobrien case NODE_PIPE: 66559243Sobrien#ifdef BACKPIPE 66659243Sobrien t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg & 66759243Sobrien (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT)); 668100616Smp execute(t->t_dcdr, wanttty, pv, pipeout, do_glob); 66959243Sobrien t->t_dcar->t_dflg |= F_PIPEOUT | 67059243Sobrien (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT)); 671100616Smp execute(t->t_dcar, wanttty, pipein, pv, do_glob); 67259243Sobrien#else /* !BACKPIPE */ 67359243Sobrien t->t_dcar->t_dflg |= F_PIPEOUT | 67459243Sobrien (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT)); 675100616Smp execute(t->t_dcar, wanttty, pipein, pv, do_glob); 67659243Sobrien t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg & 67759243Sobrien (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT)); 678100616Smp execute(t->t_dcdr, wanttty, pv, pipeout, do_glob); 67959243Sobrien#endif /* BACKPIPE */ 68059243Sobrien break; 68159243Sobrien 68259243Sobrien case NODE_LIST: 68359243Sobrien if (t->t_dcar) { 68459243Sobrien t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT; 685100616Smp execute(t->t_dcar, wanttty, NULL, NULL, do_glob); 68659243Sobrien /* 68759243Sobrien * In strange case of A&B make a new job after A 68859243Sobrien */ 68959243Sobrien if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr && 69059243Sobrien (t->t_dcdr->t_dflg & F_AMPERSAND) == 0) 69159243Sobrien pendjob(); 69259243Sobrien } 69359243Sobrien if (t->t_dcdr) { 69459243Sobrien t->t_dcdr->t_dflg |= t->t_dflg & 69559243Sobrien (F_NOFORK | F_NOINTERRUPT); 696100616Smp execute(t->t_dcdr, wanttty, NULL, NULL, do_glob); 69759243Sobrien } 69859243Sobrien break; 69959243Sobrien 70059243Sobrien case NODE_OR: 70159243Sobrien case NODE_AND: 70259243Sobrien if (t->t_dcar) { 70359243Sobrien t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT; 704100616Smp execute(t->t_dcar, wanttty, NULL, NULL, do_glob); 70559243Sobrien if ((getn(varval(STRstatus)) == 0) != 70659243Sobrien (t->t_dtyp == NODE_AND)) { 70759243Sobrien return; 70859243Sobrien } 70959243Sobrien } 71059243Sobrien if (t->t_dcdr) { 71159243Sobrien t->t_dcdr->t_dflg |= t->t_dflg & 71259243Sobrien (F_NOFORK | F_NOINTERRUPT); 713100616Smp execute(t->t_dcdr, wanttty, NULL, NULL, do_glob); 71459243Sobrien } 71559243Sobrien break; 71659243Sobrien 71759243Sobrien default: 71859243Sobrien break; 71959243Sobrien } 72059243Sobrien /* 72159243Sobrien * Fall through for all breaks from switch 72259243Sobrien * 72359243Sobrien * If there will be no more executions of this command, flush all file 72459243Sobrien * descriptors. Places that turn on the F_REPEAT bit are responsible for 72559243Sobrien * doing donefds after the last re-execution 72659243Sobrien */ 72759243Sobrien if (didfds && !(t->t_dflg & F_REPEAT)) 72859243Sobrien donefds(); 72959243Sobrien} 73059243Sobrien 73159243Sobrien#ifdef VFORK 732167465Smpstatic void 73359243Sobrien/*ARGSUSED*/ 734167465Smpvffree(int snum) 73559243Sobrien{ 73659243Sobrien USE(snum); 73759243Sobrien 73859243Sobrien _exit(1); 73959243Sobrien} 74059243Sobrien#endif /* VFORK */ 74159243Sobrien 74259243Sobrien/* 74359243Sobrien * Expand and glob the words after an i/o redirection. 74459243Sobrien * If more than one word is generated, then update the command vector. 74559243Sobrien * 74659243Sobrien * This is done differently in all the shells: 74759243Sobrien * 1. in the bourne shell and ksh globbing is not performed 74859243Sobrien * 2. Bash/csh say ambiguous 74959243Sobrien * 3. zsh does i/o to/from all the files 75059243Sobrien * 4. itcsh concatenates the words. 75159243Sobrien * 75259243Sobrien * I don't know what is best to do. I think that Ambiguous is better 75359243Sobrien * than restructuring the command vector, because the user can get 75459243Sobrien * unexpected results. In any case, the command vector restructuring 75559243Sobrien * code is present and the user can choose it by setting noambiguous 75659243Sobrien */ 75759243Sobrienstatic Char * 758167465Smpsplicepipe(struct command *t, Char *cp) 75959243Sobrien{ 76059243Sobrien Char *blk[2]; 76159243Sobrien 76259243Sobrien if (adrof(STRnoambiguous)) { 76359243Sobrien Char **pv; 764167465Smp int gflag; 76559243Sobrien 76659243Sobrien blk[0] = Dfix1(cp); /* expand $ */ 76759243Sobrien blk[1] = NULL; 76859243Sobrien 769167465Smp gflag = tglob(blk); 77059243Sobrien if (gflag) { 771167465Smp pv = globall(blk, gflag); 77259243Sobrien if (pv == NULL) { 77359243Sobrien setname(short2str(blk[0])); 774167465Smp xfree(blk[0]); 77559243Sobrien stderror(ERR_NAME | ERR_NOMATCH); 77659243Sobrien } 77759243Sobrien if (pv[1] != NULL) { /* we need to fix the command vector */ 77859243Sobrien Char **av = blkspl(t->t_dcom, &pv[1]); 779167465Smp xfree(t->t_dcom); 78059243Sobrien t->t_dcom = av; 78159243Sobrien } 782167465Smp xfree(blk[0]); 78359243Sobrien blk[0] = pv[0]; 784167465Smp xfree(pv); 78559243Sobrien } 78659243Sobrien } 78759243Sobrien else { 788167465Smp Char *buf; 78959243Sobrien 790167465Smp buf = Dfix1(cp); 791167465Smp cleanup_push(buf, xfree); 79259243Sobrien blk[0] = globone(buf, G_ERROR); 793167465Smp cleanup_until(buf); 79459243Sobrien } 79559243Sobrien return(blk[0]); 79659243Sobrien} 79759243Sobrien 79859243Sobrien/* 79959243Sobrien * Perform io redirection. 80059243Sobrien * We may or maynot be forked here. 80159243Sobrien */ 80259243Sobrienstatic void 803167465Smpdoio(struct command *t, int *pipein, int *pipeout) 80459243Sobrien{ 805145479Smp int fd; 806145479Smp Char *cp; 807145479Smp unsigned long flags = t->t_dflg; 80859243Sobrien 80959243Sobrien if (didfds || (flags & F_REPEAT)) 81059243Sobrien return; 81159243Sobrien if ((flags & F_READ) == 0) {/* F_READ already done */ 81259243Sobrien if (t->t_dlef) { 813167465Smp char *tmp; 81459243Sobrien 81559243Sobrien /* 81659243Sobrien * so < /dev/std{in,out,err} work 81759243Sobrien */ 81859243Sobrien (void) dcopy(SHIN, 0); 81959243Sobrien (void) dcopy(SHOUT, 1); 82059243Sobrien (void) dcopy(SHDIAG, 2); 82159243Sobrien cp = splicepipe(t, t->t_dlef); 822167465Smp tmp = strsave(short2str(cp)); 823167465Smp xfree(cp); 824167465Smp cleanup_push(tmp, xfree); 825167465Smp if ((fd = xopen(tmp, O_RDONLY|O_LARGEFILE)) < 0) 82659243Sobrien stderror(ERR_SYSTEM, tmp, strerror(errno)); 827167465Smp cleanup_until(tmp); 82859243Sobrien /* allow input files larger than 2Gb */ 829131962Smp#ifndef WINNT_NATIVE 830145479Smp (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE); 831131962Smp#endif /*!WINNT_NATIVE*/ 83259243Sobrien (void) dmove(fd, 0); 83359243Sobrien } 83459243Sobrien else if (flags & F_PIPEIN) { 835167465Smp xclose(0); 83659243Sobrien (void) dup(pipein[0]); 837167465Smp xclose(pipein[0]); 838167465Smp xclose(pipein[1]); 83959243Sobrien } 84059243Sobrien else if ((flags & F_NOINTERRUPT) && tpgrp == -1) { 841167465Smp xclose(0); 842167465Smp (void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE); 84359243Sobrien } 84459243Sobrien else { 845167465Smp xclose(0); 84659243Sobrien (void) dup(OLDSTD); 84759243Sobrien#if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS) 84859243Sobrien /* 84959243Sobrien * PWP: Unlike Bezerkeley 4.3, FIONCLEX for Pyramid is preserved 85059243Sobrien * across dup()s, so we have to UNSET it here or else we get a 85159243Sobrien * command with NO stdin, stdout, or stderr at all (a bad thing 85259243Sobrien * indeed) 85359243Sobrien */ 85459243Sobrien (void) close_on_exec(0, 0); 85559243Sobrien#endif /* CLOSE_ON_EXEC && CLEX_DUPS */ 85659243Sobrien } 85759243Sobrien } 85859243Sobrien if (t->t_drit) { 859167465Smp char *tmp; 86059243Sobrien 86159243Sobrien cp = splicepipe(t, t->t_drit); 862167465Smp tmp = strsave(short2str(cp)); 863167465Smp xfree(cp); 864167465Smp cleanup_push(tmp, xfree); 86559243Sobrien /* 86659243Sobrien * so > /dev/std{out,err} work 86759243Sobrien */ 86859243Sobrien (void) dcopy(SHOUT, 1); 86959243Sobrien (void) dcopy(SHDIAG, 2); 87059243Sobrien if ((flags & F_APPEND) != 0) { 87159243Sobrien#ifdef O_APPEND 872167465Smp fd = xopen(tmp, O_WRONLY|O_APPEND|O_LARGEFILE); 87359243Sobrien#else /* !O_APPEND */ 874167465Smp fd = xopen(tmp, O_WRONLY|O_LARGEFILE); 87559243Sobrien (void) lseek(fd, (off_t) 0, L_XTND); 87659243Sobrien#endif /* O_APPEND */ 87759243Sobrien } 87859243Sobrien else 87959243Sobrien fd = 0; 88059243Sobrien if ((flags & F_APPEND) == 0 || fd == -1) { 88159243Sobrien if (!(flags & F_OVERWRITE) && adrof(STRnoclobber)) { 88259243Sobrien if (flags & F_APPEND) 88359243Sobrien stderror(ERR_SYSTEM, tmp, strerror(errno)); 88459243Sobrien chkclob(tmp); 88559243Sobrien } 886167465Smp if ((fd = xcreat(tmp, 0666)) < 0) 88759243Sobrien stderror(ERR_SYSTEM, tmp, strerror(errno)); 88859243Sobrien /* allow input files larger than 2Gb */ 889131962Smp#ifndef WINNT_NATIVE 890145479Smp (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE); 891131962Smp#endif /*!WINNT_NATIVE*/ 89259243Sobrien } 893167465Smp cleanup_until(tmp); 89459243Sobrien (void) dmove(fd, 1); 89559243Sobrien is1atty = isatty(1); 89659243Sobrien } 89759243Sobrien else if (flags & F_PIPEOUT) { 898167465Smp xclose(1); 89959243Sobrien (void) dup(pipeout[1]); 90059243Sobrien is1atty = 0; 90159243Sobrien } 90259243Sobrien else { 903167465Smp xclose(1); 90459243Sobrien (void) dup(SHOUT); 90559243Sobrien is1atty = isoutatty; 90659243Sobrien# if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS) 90759243Sobrien (void) close_on_exec(1, 0); 90859243Sobrien# endif /* CLOSE_ON_EXEC && CLEX_DUPS */ 90959243Sobrien } 91059243Sobrien 911167465Smp xclose(2); 91259243Sobrien if (flags & F_STDERR) { 91359243Sobrien (void) dup(1); 91459243Sobrien is2atty = is1atty; 91559243Sobrien } 91659243Sobrien else { 91759243Sobrien (void) dup(SHDIAG); 91859243Sobrien is2atty = isdiagatty; 91959243Sobrien# if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS) 92059243Sobrien (void) close_on_exec(2, 0); 92159243Sobrien# endif /* CLOSE_ON_EXEC && CLEX_DUPS */ 92259243Sobrien } 92359243Sobrien didfds = 1; 92459243Sobrien} 92559243Sobrien 92659243Sobrienvoid 927167465Smpmypipe(int *pv) 92859243Sobrien{ 92959243Sobrien 93059243Sobrien if (pipe(pv) < 0) 93159243Sobrien goto oops; 932145479Smp (void)close_on_exec(pv[0] = dmove(pv[0], -1), 1); 933145479Smp (void)close_on_exec(pv[1] = dmove(pv[1], -1), 1); 93459243Sobrien if (pv[0] >= 0 && pv[1] >= 0) 93559243Sobrien return; 936167465Smp if (pv[0] >= 0) 937167465Smp xclose(pv[0]); 938167465Smp if (pv[1] >= 0) 939167465Smp xclose(pv[1]); 94059243Sobrienoops: 94159243Sobrien stderror(ERR_PIPE); 94259243Sobrien} 94359243Sobrien 94459243Sobrienstatic void 945167465Smpchkclob(const char *cp) 94659243Sobrien{ 94759243Sobrien struct stat stb; 94859243Sobrien 94959243Sobrien if (stat(cp, &stb) < 0) 95059243Sobrien return; 95159243Sobrien if (S_ISCHR(stb.st_mode)) 95259243Sobrien return; 95359243Sobrien stderror(ERR_EXISTS, cp); 95459243Sobrien} 955