eval.c revision 201343
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/eval.c 201343 2009-12-31 16:13:33Z jilles $"); 401556Srgrimes 41100437Stjr#include <paths.h> 4217987Speter#include <signal.h> 43102576Skeramida#include <stdlib.h> 4417987Speter#include <unistd.h> 45153091Sstefanf#include <sys/resource.h> 4645266Scracauer#include <sys/wait.h> /* For WIFSIGNALED(status) */ 4753891Scracauer#include <errno.h> 4817987Speter 491556Srgrimes/* 501556Srgrimes * Evaluate a command. 511556Srgrimes */ 521556Srgrimes 531556Srgrimes#include "shell.h" 541556Srgrimes#include "nodes.h" 551556Srgrimes#include "syntax.h" 561556Srgrimes#include "expand.h" 571556Srgrimes#include "parser.h" 581556Srgrimes#include "jobs.h" 591556Srgrimes#include "eval.h" 601556Srgrimes#include "builtins.h" 611556Srgrimes#include "options.h" 621556Srgrimes#include "exec.h" 631556Srgrimes#include "redir.h" 641556Srgrimes#include "input.h" 651556Srgrimes#include "output.h" 661556Srgrimes#include "trap.h" 671556Srgrimes#include "var.h" 681556Srgrimes#include "memalloc.h" 691556Srgrimes#include "error.h" 7017987Speter#include "show.h" 711556Srgrimes#include "mystring.h" 7217987Speter#ifndef NO_HISTORY 731556Srgrimes#include "myhistedit.h" 7417987Speter#endif 751556Srgrimes 761556Srgrimes 77201053Sjillesint evalskip; /* set if we are skipping commands */ 781556SrgrimesSTATIC int skipcount; /* number of levels to skip */ 791556SrgrimesMKINIT int loopnest; /* current loop nesting level */ 801556Srgrimesint funcnest; /* depth of function calls */ 81193169SstefanfSTATIC int builtin_flags; /* evalcommand flags for builtins */ 821556Srgrimes 831556Srgrimes 841556Srgrimeschar *commandname; 851556Srgrimesstruct strlist *cmdenviron; 861556Srgrimesint exitstatus; /* exit status of last command */ 8717987Speterint oexitstatus; /* saved exit status */ 881556Srgrimes 891556Srgrimes 90149933SstefanfSTATIC void evalloop(union node *, int); 91149933SstefanfSTATIC void evalfor(union node *, int); 9290111SimpSTATIC void evalcase(union node *, int); 9390111SimpSTATIC void evalsubshell(union node *, int); 9490111SimpSTATIC void expredir(union node *); 9590111SimpSTATIC void evalpipe(union node *); 9690111SimpSTATIC void evalcommand(union node *, int, struct backcmd *); 9790111SimpSTATIC void prehash(union node *); 981556Srgrimes 991556Srgrimes 1001556Srgrimes/* 1011556Srgrimes * Called to reset things after an exception. 1021556Srgrimes */ 1031556Srgrimes 1041556Srgrimes#ifdef mkinit 1051556SrgrimesINCLUDE "eval.h" 1061556Srgrimes 1071556SrgrimesRESET { 1081556Srgrimes evalskip = 0; 1091556Srgrimes loopnest = 0; 1101556Srgrimes funcnest = 0; 1111556Srgrimes} 1121556Srgrimes 1131556SrgrimesSHELLPROC { 1141556Srgrimes exitstatus = 0; 1151556Srgrimes} 1161556Srgrimes#endif 1171556Srgrimes 1181556Srgrimes 1191556Srgrimes 1201556Srgrimes/* 12146684Skris * The eval command. 1221556Srgrimes */ 1231556Srgrimes 12417987Speterint 12590111Simpevalcmd(int argc, char **argv) 1261556Srgrimes{ 1271556Srgrimes char *p; 1281556Srgrimes char *concat; 1291556Srgrimes char **ap; 1301556Srgrimes 1311556Srgrimes if (argc > 1) { 1321556Srgrimes p = argv[1]; 1331556Srgrimes if (argc > 2) { 1341556Srgrimes STARTSTACKSTR(concat); 1351556Srgrimes ap = argv + 2; 1361556Srgrimes for (;;) { 1371556Srgrimes while (*p) 1381556Srgrimes STPUTC(*p++, concat); 1391556Srgrimes if ((p = *ap++) == NULL) 1401556Srgrimes break; 1411556Srgrimes STPUTC(' ', concat); 1421556Srgrimes } 1431556Srgrimes STPUTC('\0', concat); 1441556Srgrimes p = grabstackstr(concat); 1451556Srgrimes } 146193169Sstefanf evalstring(p, builtin_flags & EV_TESTED); 1471556Srgrimes } 1481556Srgrimes return exitstatus; 1491556Srgrimes} 1501556Srgrimes 1511556Srgrimes 1521556Srgrimes/* 1531556Srgrimes * Execute a command or commands contained in a string. 1541556Srgrimes */ 1551556Srgrimes 1561556Srgrimesvoid 157193169Sstefanfevalstring(char *s, int flags) 15890111Simp{ 1591556Srgrimes union node *n; 1601556Srgrimes struct stackmark smark; 161194128Sjilles int flags_exit; 1621556Srgrimes 163194128Sjilles flags_exit = flags & EV_EXIT; 164194128Sjilles flags &= ~EV_EXIT; 1651556Srgrimes setstackmark(&smark); 1661556Srgrimes setinputstring(s, 1); 1671556Srgrimes while ((n = parsecmd(0)) != NEOF) { 168194128Sjilles if (n != NULL) { 169194128Sjilles if (flags_exit && preadateof()) 170194128Sjilles evaltree(n, flags | EV_EXIT); 171194128Sjilles else 172194128Sjilles evaltree(n, flags); 173194128Sjilles } 1741556Srgrimes popstackmark(&smark); 1751556Srgrimes } 1761556Srgrimes popfile(); 1771556Srgrimes popstackmark(&smark); 178194128Sjilles if (flags_exit) 179194128Sjilles exitshell(exitstatus); 1801556Srgrimes} 1811556Srgrimes 1821556Srgrimes 1831556Srgrimes/* 1841556Srgrimes * Evaluate a parse tree. The value is left in the global variable 1851556Srgrimes * exitstatus. 1861556Srgrimes */ 1871556Srgrimes 1881556Srgrimesvoid 18990111Simpevaltree(union node *n, int flags) 19017987Speter{ 191149927Sstefanf int do_etest; 192149927Sstefanf 193149927Sstefanf do_etest = 0; 1941556Srgrimes if (n == NULL) { 1951556Srgrimes TRACE(("evaltree(NULL) called\n")); 1961556Srgrimes exitstatus = 0; 1971556Srgrimes goto out; 1981556Srgrimes } 19917987Speter#ifndef NO_HISTORY 2001556Srgrimes displayhist = 1; /* show history substitutions done with fc */ 20117987Speter#endif 202149802Sstefanf TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); 2031556Srgrimes switch (n->type) { 2041556Srgrimes case NSEMI: 205149932Sstefanf evaltree(n->nbinary.ch1, flags & ~EV_EXIT); 2061556Srgrimes if (evalskip) 2071556Srgrimes goto out; 2081556Srgrimes evaltree(n->nbinary.ch2, flags); 2091556Srgrimes break; 2101556Srgrimes case NAND: 2111556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 21218754Ssteve if (evalskip || exitstatus != 0) { 2131556Srgrimes goto out; 21418754Ssteve } 2151556Srgrimes evaltree(n->nbinary.ch2, flags); 2161556Srgrimes break; 2171556Srgrimes case NOR: 2181556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 2191556Srgrimes if (evalskip || exitstatus == 0) 2201556Srgrimes goto out; 2211556Srgrimes evaltree(n->nbinary.ch2, flags); 2221556Srgrimes break; 2231556Srgrimes case NREDIR: 2241556Srgrimes expredir(n->nredir.redirect); 2251556Srgrimes redirect(n->nredir.redirect, REDIR_PUSH); 2261556Srgrimes evaltree(n->nredir.n, flags); 2271556Srgrimes popredir(); 2281556Srgrimes break; 2291556Srgrimes case NSUBSHELL: 2301556Srgrimes evalsubshell(n, flags); 231149927Sstefanf do_etest = !(flags & EV_TESTED); 2321556Srgrimes break; 2331556Srgrimes case NBACKGND: 2341556Srgrimes evalsubshell(n, flags); 2351556Srgrimes break; 2361556Srgrimes case NIF: { 2371556Srgrimes evaltree(n->nif.test, EV_TESTED); 2381556Srgrimes if (evalskip) 2391556Srgrimes goto out; 24020425Ssteve if (exitstatus == 0) 2411556Srgrimes evaltree(n->nif.ifpart, flags); 24217987Speter else if (n->nif.elsepart) 2431556Srgrimes evaltree(n->nif.elsepart, flags); 24420425Ssteve else 24520425Ssteve exitstatus = 0; 2461556Srgrimes break; 2471556Srgrimes } 2481556Srgrimes case NWHILE: 2491556Srgrimes case NUNTIL: 250149933Sstefanf evalloop(n, flags & ~EV_EXIT); 2511556Srgrimes break; 2521556Srgrimes case NFOR: 253149933Sstefanf evalfor(n, flags & ~EV_EXIT); 2541556Srgrimes break; 2551556Srgrimes case NCASE: 2561556Srgrimes evalcase(n, flags); 2571556Srgrimes break; 2581556Srgrimes case NDEFUN: 2591556Srgrimes defun(n->narg.text, n->narg.next); 2601556Srgrimes exitstatus = 0; 2611556Srgrimes break; 2621556Srgrimes case NNOT: 2631556Srgrimes evaltree(n->nnot.com, EV_TESTED); 2641556Srgrimes exitstatus = !exitstatus; 2651556Srgrimes break; 2661556Srgrimes 2671556Srgrimes case NPIPE: 2681556Srgrimes evalpipe(n); 269149927Sstefanf do_etest = !(flags & EV_TESTED); 2701556Srgrimes break; 2711556Srgrimes case NCMD: 2721556Srgrimes evalcommand(n, flags, (struct backcmd *)NULL); 273149927Sstefanf do_etest = !(flags & EV_TESTED); 2741556Srgrimes break; 2751556Srgrimes default: 2761556Srgrimes out1fmt("Node type = %d\n", n->type); 2771556Srgrimes flushout(&output); 2781556Srgrimes break; 2791556Srgrimes } 2801556Srgrimesout: 2811556Srgrimes if (pendingsigs) 2821556Srgrimes dotrap(); 283149927Sstefanf if ((flags & EV_EXIT) || (eflag && exitstatus != 0 && do_etest)) 2841556Srgrimes exitshell(exitstatus); 2851556Srgrimes} 2861556Srgrimes 2871556Srgrimes 2881556SrgrimesSTATIC void 289149933Sstefanfevalloop(union node *n, int flags) 29017987Speter{ 2911556Srgrimes int status; 2921556Srgrimes 2931556Srgrimes loopnest++; 2941556Srgrimes status = 0; 2951556Srgrimes for (;;) { 2961556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 2971556Srgrimes if (evalskip) { 2981556Srgrimesskipping: if (evalskip == SKIPCONT && --skipcount <= 0) { 2991556Srgrimes evalskip = 0; 3001556Srgrimes continue; 3011556Srgrimes } 3021556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3031556Srgrimes evalskip = 0; 3041556Srgrimes break; 3051556Srgrimes } 3061556Srgrimes if (n->type == NWHILE) { 3071556Srgrimes if (exitstatus != 0) 3081556Srgrimes break; 3091556Srgrimes } else { 3101556Srgrimes if (exitstatus == 0) 3111556Srgrimes break; 3121556Srgrimes } 313149933Sstefanf evaltree(n->nbinary.ch2, flags); 3141556Srgrimes status = exitstatus; 3151556Srgrimes if (evalskip) 3161556Srgrimes goto skipping; 3171556Srgrimes } 3181556Srgrimes loopnest--; 3191556Srgrimes exitstatus = status; 3201556Srgrimes} 3211556Srgrimes 3221556Srgrimes 3231556Srgrimes 3241556SrgrimesSTATIC void 325149933Sstefanfevalfor(union node *n, int flags) 32617987Speter{ 3271556Srgrimes struct arglist arglist; 3281556Srgrimes union node *argp; 3291556Srgrimes struct strlist *sp; 3301556Srgrimes struct stackmark smark; 3311556Srgrimes 3321556Srgrimes setstackmark(&smark); 3331556Srgrimes arglist.lastp = &arglist.list; 3341556Srgrimes for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { 33517987Speter oexitstatus = exitstatus; 3361556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 3371556Srgrimes if (evalskip) 3381556Srgrimes goto out; 3391556Srgrimes } 3401556Srgrimes *arglist.lastp = NULL; 3411556Srgrimes 3421556Srgrimes exitstatus = 0; 3431556Srgrimes loopnest++; 3441556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 3451556Srgrimes setvar(n->nfor.var, sp->text, 0); 346149933Sstefanf evaltree(n->nfor.body, flags); 3471556Srgrimes if (evalskip) { 3481556Srgrimes if (evalskip == SKIPCONT && --skipcount <= 0) { 3491556Srgrimes evalskip = 0; 3501556Srgrimes continue; 3511556Srgrimes } 3521556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3531556Srgrimes evalskip = 0; 3541556Srgrimes break; 3551556Srgrimes } 3561556Srgrimes } 3571556Srgrimes loopnest--; 3581556Srgrimesout: 3591556Srgrimes popstackmark(&smark); 3601556Srgrimes} 3611556Srgrimes 3621556Srgrimes 3631556Srgrimes 3641556SrgrimesSTATIC void 36590111Simpevalcase(union node *n, int flags) 36617987Speter{ 3671556Srgrimes union node *cp; 3681556Srgrimes union node *patp; 3691556Srgrimes struct arglist arglist; 3701556Srgrimes struct stackmark smark; 3711556Srgrimes 3721556Srgrimes setstackmark(&smark); 3731556Srgrimes arglist.lastp = &arglist.list; 37417987Speter oexitstatus = exitstatus; 375172440Sstefanf exitstatus = 0; 3761556Srgrimes expandarg(n->ncase.expr, &arglist, EXP_TILDE); 3771556Srgrimes for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) { 3781556Srgrimes for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { 3791556Srgrimes if (casematch(patp, arglist.list->text)) { 3801556Srgrimes if (evalskip == 0) { 3811556Srgrimes evaltree(cp->nclist.body, flags); 3821556Srgrimes } 3831556Srgrimes goto out; 3841556Srgrimes } 3851556Srgrimes } 3861556Srgrimes } 3871556Srgrimesout: 3881556Srgrimes popstackmark(&smark); 3891556Srgrimes} 3901556Srgrimes 3911556Srgrimes 3921556Srgrimes 3931556Srgrimes/* 3941556Srgrimes * Kick off a subshell to evaluate a tree. 3951556Srgrimes */ 3961556Srgrimes 3971556SrgrimesSTATIC void 39890111Simpevalsubshell(union node *n, int flags) 39917987Speter{ 4001556Srgrimes struct job *jp; 4011556Srgrimes int backgnd = (n->type == NBACKGND); 4021556Srgrimes 4031556Srgrimes expredir(n->nredir.redirect); 404194774Sjilles if ((!backgnd && flags & EV_EXIT && !have_traps()) || 405194774Sjilles forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 4061556Srgrimes if (backgnd) 4071556Srgrimes flags &=~ EV_TESTED; 4081556Srgrimes redirect(n->nredir.redirect, 0); 4091556Srgrimes evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 410201053Sjilles } else if (! backgnd) { 4111556Srgrimes INTOFF; 41245916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4131556Srgrimes INTON; 4141556Srgrimes } 4151556Srgrimes} 4161556Srgrimes 4171556Srgrimes 4181556Srgrimes 4191556Srgrimes/* 4201556Srgrimes * Compute the names of the files in a redirection list. 4211556Srgrimes */ 4221556Srgrimes 4231556SrgrimesSTATIC void 42490111Simpexpredir(union node *n) 42517987Speter{ 42625222Ssteve union node *redir; 4271556Srgrimes 4281556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 42917987Speter struct arglist fn; 43017987Speter fn.lastp = &fn.list; 43117987Speter oexitstatus = exitstatus; 43217987Speter switch (redir->type) { 43317987Speter case NFROM: 43417987Speter case NTO: 43566612Sbrian case NFROMTO: 43617987Speter case NAPPEND: 43796922Stjr case NCLOBBER: 4381556Srgrimes expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 4391556Srgrimes redir->nfile.expfname = fn.list->text; 44017987Speter break; 44117987Speter case NFROMFD: 44217987Speter case NTOFD: 44317987Speter if (redir->ndup.vname) { 444181017Sstefanf expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 44517987Speter fixredir(redir, fn.list->text, 1); 44617987Speter } 44717987Speter break; 4481556Srgrimes } 4491556Srgrimes } 4501556Srgrimes} 4511556Srgrimes 4521556Srgrimes 4531556Srgrimes 4541556Srgrimes/* 4551556Srgrimes * Evaluate a pipeline. All the processes in the pipeline are children 4561556Srgrimes * of the process creating the pipeline. (This differs from some versions 4571556Srgrimes * of the shell, which make the last process in a pipeline the parent 4581556Srgrimes * of all the rest.) 4591556Srgrimes */ 4601556Srgrimes 4611556SrgrimesSTATIC void 46290111Simpevalpipe(union node *n) 46317987Speter{ 4641556Srgrimes struct job *jp; 4651556Srgrimes struct nodelist *lp; 4661556Srgrimes int pipelen; 4671556Srgrimes int prevfd; 4681556Srgrimes int pip[2]; 4691556Srgrimes 470149802Sstefanf TRACE(("evalpipe(%p) called\n", (void *)n)); 4711556Srgrimes pipelen = 0; 4721556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 4731556Srgrimes pipelen++; 4741556Srgrimes INTOFF; 4751556Srgrimes jp = makejob(n, pipelen); 4761556Srgrimes prevfd = -1; 4771556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 4781556Srgrimes prehash(lp->n); 4791556Srgrimes pip[1] = -1; 4801556Srgrimes if (lp->next) { 4811556Srgrimes if (pipe(pip) < 0) { 4821556Srgrimes close(prevfd); 48353891Scracauer error("Pipe call failed: %s", strerror(errno)); 4841556Srgrimes } 4851556Srgrimes } 4861556Srgrimes if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 4871556Srgrimes INTON; 4881556Srgrimes if (prevfd > 0) { 489124780Sdes dup2(prevfd, 0); 4901556Srgrimes close(prevfd); 4911556Srgrimes } 4921556Srgrimes if (pip[1] >= 0) { 49353282Scracauer if (!(prevfd >= 0 && pip[0] == 0)) 49452900Scracauer close(pip[0]); 4951556Srgrimes if (pip[1] != 1) { 496124780Sdes dup2(pip[1], 1); 4971556Srgrimes close(pip[1]); 4981556Srgrimes } 4991556Srgrimes } 5001556Srgrimes evaltree(lp->n, EV_EXIT); 5011556Srgrimes } 5021556Srgrimes if (prevfd >= 0) 5031556Srgrimes close(prevfd); 5041556Srgrimes prevfd = pip[0]; 5051556Srgrimes close(pip[1]); 5061556Srgrimes } 5071556Srgrimes INTON; 5081556Srgrimes if (n->npipe.backgnd == 0) { 5091556Srgrimes INTOFF; 51045916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 5111556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 5121556Srgrimes INTON; 5131556Srgrimes } 5141556Srgrimes} 5151556Srgrimes 5161556Srgrimes 5171556Srgrimes 5181556Srgrimes/* 5191556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 5201556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 5211556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 5221556Srgrimes * Should be called with interrupts off. 5231556Srgrimes */ 5241556Srgrimes 5251556Srgrimesvoid 52690111Simpevalbackcmd(union node *n, struct backcmd *result) 52717987Speter{ 5281556Srgrimes int pip[2]; 5291556Srgrimes struct job *jp; 5301556Srgrimes struct stackmark smark; /* unnecessary */ 5311556Srgrimes 5321556Srgrimes setstackmark(&smark); 5331556Srgrimes result->fd = -1; 5341556Srgrimes result->buf = NULL; 5351556Srgrimes result->nleft = 0; 5361556Srgrimes result->jp = NULL; 53717987Speter if (n == NULL) { 53817987Speter exitstatus = 0; 5391556Srgrimes goto out; 54017987Speter } 5411556Srgrimes if (n->type == NCMD) { 54217987Speter exitstatus = oexitstatus; 5431556Srgrimes evalcommand(n, EV_BACKCMD, result); 5441556Srgrimes } else { 54517987Speter exitstatus = 0; 5461556Srgrimes if (pipe(pip) < 0) 54753891Scracauer error("Pipe call failed: %s", strerror(errno)); 5481556Srgrimes jp = makejob(n, 1); 5491556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 5501556Srgrimes FORCEINTON; 5511556Srgrimes close(pip[0]); 5521556Srgrimes if (pip[1] != 1) { 553124780Sdes dup2(pip[1], 1); 5541556Srgrimes close(pip[1]); 5551556Srgrimes } 5561556Srgrimes evaltree(n, EV_EXIT); 5571556Srgrimes } 5581556Srgrimes close(pip[1]); 5591556Srgrimes result->fd = pip[0]; 5601556Srgrimes result->jp = jp; 5611556Srgrimes } 5621556Srgrimesout: 5631556Srgrimes popstackmark(&smark); 564109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 5651556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 5661556Srgrimes} 5671556Srgrimes 5681556Srgrimes 5691556Srgrimes 5701556Srgrimes/* 5711556Srgrimes * Execute a simple command. 5721556Srgrimes */ 5731556Srgrimes 5741556SrgrimesSTATIC void 57590111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 57617987Speter{ 5771556Srgrimes struct stackmark smark; 5781556Srgrimes union node *argp; 5791556Srgrimes struct arglist arglist; 5801556Srgrimes struct arglist varlist; 5811556Srgrimes char **argv; 5821556Srgrimes int argc; 5831556Srgrimes char **envp; 5841556Srgrimes int varflag; 5851556Srgrimes struct strlist *sp; 5861556Srgrimes int mode; 5871556Srgrimes int pip[2]; 5881556Srgrimes struct cmdentry cmdentry; 5891556Srgrimes struct job *jp; 5901556Srgrimes struct jmploc jmploc; 591194765Sjilles struct jmploc *savehandler; 592194765Sjilles char *savecmdname; 593194765Sjilles struct shparam saveparam; 594194765Sjilles struct localvar *savelocalvars; 595199647Sjilles struct parsefile *savetopfile; 5961556Srgrimes volatile int e; 5971556Srgrimes char *lastarg; 59845916Scracauer int realstatus; 59954884Scracauer int do_clearcmdentry; 6001556Srgrimes 6011556Srgrimes /* First expand the arguments. */ 602149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 6031556Srgrimes setstackmark(&smark); 6041556Srgrimes arglist.lastp = &arglist.list; 6051556Srgrimes varlist.lastp = &varlist.list; 6061556Srgrimes varflag = 1; 60754884Scracauer do_clearcmdentry = 0; 60817987Speter oexitstatus = exitstatus; 60917987Speter exitstatus = 0; 6101556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 61117987Speter char *p = argp->narg.text; 6121556Srgrimes if (varflag && is_name(*p)) { 6131556Srgrimes do { 6141556Srgrimes p++; 6151556Srgrimes } while (is_in_name(*p)); 6161556Srgrimes if (*p == '=') { 6171556Srgrimes expandarg(argp, &varlist, EXP_VARTILDE); 6181556Srgrimes continue; 6191556Srgrimes } 6201556Srgrimes } 6211556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 6221556Srgrimes varflag = 0; 6231556Srgrimes } 6241556Srgrimes *arglist.lastp = NULL; 6251556Srgrimes *varlist.lastp = NULL; 6261556Srgrimes expredir(cmd->ncmd.redirect); 6271556Srgrimes argc = 0; 6281556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 6291556Srgrimes argc++; 6301556Srgrimes argv = stalloc(sizeof (char *) * (argc + 1)); 6311556Srgrimes 6321556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 6331556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 6341556Srgrimes *argv++ = sp->text; 6351556Srgrimes } 6361556Srgrimes *argv = NULL; 6371556Srgrimes lastarg = NULL; 6381556Srgrimes if (iflag && funcnest == 0 && argc > 0) 6391556Srgrimes lastarg = argv[-1]; 6401556Srgrimes argv -= argc; 6411556Srgrimes 6421556Srgrimes /* Print the command if xflag is set. */ 6431556Srgrimes if (xflag) { 644159632Sstefanf char sep = 0; 645194786Sjilles const char *p; 646159632Sstefanf out2str(ps4val()); 6471556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 648159632Sstefanf if (sep != 0) 649159632Sstefanf outc(' ', &errout); 650194786Sjilles p = sp->text; 651194786Sjilles while (*p != '=' && *p != '\0') 652194786Sjilles out2c(*p++); 653194786Sjilles if (*p != '\0') { 654194786Sjilles out2c(*p++); 655194786Sjilles out2qstr(p); 656194786Sjilles } 657159632Sstefanf sep = ' '; 6581556Srgrimes } 6591556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 660159632Sstefanf if (sep != 0) 661159632Sstefanf outc(' ', &errout); 662194786Sjilles /* Disambiguate command looking like assignment. */ 663194786Sjilles if (sp == arglist.list && 664194786Sjilles strchr(sp->text, '=') != NULL && 665194786Sjilles strchr(sp->text, '\'') == NULL) { 666194786Sjilles out2c('\''); 667194786Sjilles out2str(sp->text); 668194786Sjilles out2c('\''); 669194786Sjilles } else 670194786Sjilles out2qstr(sp->text); 671159632Sstefanf sep = ' '; 6721556Srgrimes } 6731556Srgrimes outc('\n', &errout); 6741556Srgrimes flushout(&errout); 6751556Srgrimes } 6761556Srgrimes 6771556Srgrimes /* Now locate the command. */ 6781556Srgrimes if (argc == 0) { 679157601Sstefanf /* Variable assignment(s) without command */ 6801556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 6811556Srgrimes cmdentry.u.index = BLTINCMD; 682157601Sstefanf cmdentry.special = 1; 6831556Srgrimes } else { 68417987Speter static const char PATH[] = "PATH="; 68517987Speter char *path = pathval(); 68617987Speter 68717987Speter /* 68817987Speter * Modify the command lookup path, if a PATH= assignment 68917987Speter * is present 69017987Speter */ 69117987Speter for (sp = varlist.list ; sp ; sp = sp->next) 69254884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 69317987Speter path = sp->text + sizeof(PATH) - 1; 694155301Sschweikh /* 69554884Scracauer * On `PATH=... command`, we need to make 69654884Scracauer * sure that the command isn't using the 69754884Scracauer * non-updated hash table of the outer PATH 698155301Sschweikh * setting and we need to make sure that 69954884Scracauer * the hash table isn't filled with items 70054884Scracauer * from the temporary setting. 70154884Scracauer * 702155301Sschweikh * It would be better to forbit using and 70354884Scracauer * updating the table while this command 70454884Scracauer * runs, by the command finding mechanism 70554884Scracauer * is heavily integrated with hash handling, 70654884Scracauer * so we just delete the hash before and after 70754884Scracauer * the command runs. Partly deleting like 70854884Scracauer * changepatch() does doesn't seem worth the 70954884Scracauer * bookinging effort, since most such runs add 710123996Smaxim * directories in front of the new PATH. 71154884Scracauer */ 71254884Scracauer clearcmdentry(0); 71354884Scracauer do_clearcmdentry = 1; 71454884Scracauer } 71517987Speter 716197820Sjilles find_command(argv[0], &cmdentry, 0, path); 7171556Srgrimes /* implement the bltin builtin here */ 7181556Srgrimes if (cmdentry.cmdtype == CMDBUILTIN && cmdentry.u.index == BLTINCMD) { 7191556Srgrimes for (;;) { 7201556Srgrimes argv++; 7211556Srgrimes if (--argc == 0) 7221556Srgrimes break; 723157601Sstefanf if ((cmdentry.u.index = find_builtin(*argv, 724157601Sstefanf &cmdentry.special)) < 0) { 7251556Srgrimes outfmt(&errout, "%s: not found\n", *argv); 72620425Ssteve exitstatus = 127; 7271556Srgrimes flushout(&errout); 7281556Srgrimes return; 7291556Srgrimes } 7301556Srgrimes if (cmdentry.u.index != BLTINCMD) 7311556Srgrimes break; 7321556Srgrimes } 7331556Srgrimes } 7341556Srgrimes } 7351556Srgrimes 7361556Srgrimes /* Fork off a child process if necessary. */ 7371556Srgrimes if (cmd->ncmd.backgnd 738197820Sjilles || ((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 739194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 74017987Speter || ((flags & EV_BACKCMD) != 0 7411556Srgrimes && (cmdentry.cmdtype != CMDBUILTIN 74248896Ssheldonh || cmdentry.u.index == CDCMD 7431556Srgrimes || cmdentry.u.index == DOTCMD 744100437Stjr || cmdentry.u.index == EVALCMD)) 745100437Stjr || (cmdentry.cmdtype == CMDBUILTIN && 746100437Stjr cmdentry.u.index == COMMANDCMD)) { 7471556Srgrimes jp = makejob(cmd, 1); 7481556Srgrimes mode = cmd->ncmd.backgnd; 7491556Srgrimes if (flags & EV_BACKCMD) { 7501556Srgrimes mode = FORK_NOJOB; 7511556Srgrimes if (pipe(pip) < 0) 75253891Scracauer error("Pipe call failed: %s", strerror(errno)); 7531556Srgrimes } 7541556Srgrimes if (forkshell(jp, cmd, mode) != 0) 7551556Srgrimes goto parent; /* at end of routine */ 7561556Srgrimes if (flags & EV_BACKCMD) { 7571556Srgrimes FORCEINTON; 7581556Srgrimes close(pip[0]); 7591556Srgrimes if (pip[1] != 1) { 760124780Sdes dup2(pip[1], 1); 7611556Srgrimes close(pip[1]); 7621556Srgrimes } 7631556Srgrimes } 7641556Srgrimes flags |= EV_EXIT; 7651556Srgrimes } 7661556Srgrimes 7671556Srgrimes /* This is the child process if a fork occurred. */ 7681556Srgrimes /* Execute the command. */ 7691556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 77020425Ssteve#ifdef DEBUG 7711556Srgrimes trputs("Shell function: "); trargs(argv); 77220425Ssteve#endif 7731556Srgrimes redirect(cmd->ncmd.redirect, REDIR_PUSH); 7741556Srgrimes saveparam = shellparam; 7751556Srgrimes shellparam.malloc = 0; 77620425Ssteve shellparam.reset = 1; 7771556Srgrimes shellparam.nparam = argc - 1; 7781556Srgrimes shellparam.p = argv + 1; 7791556Srgrimes shellparam.optnext = NULL; 7801556Srgrimes INTOFF; 7811556Srgrimes savelocalvars = localvars; 7821556Srgrimes localvars = NULL; 783196483Sjilles reffunc(cmdentry.u.func); 784194765Sjilles savehandler = handler; 7851556Srgrimes if (setjmp(jmploc.loc)) { 7861556Srgrimes if (exception == EXSHELLPROC) 787194765Sjilles freeparam(&saveparam); 7881556Srgrimes else { 7891556Srgrimes freeparam(&shellparam); 7901556Srgrimes shellparam = saveparam; 7911556Srgrimes } 792196483Sjilles unreffunc(cmdentry.u.func); 7931556Srgrimes poplocalvars(); 7941556Srgrimes localvars = savelocalvars; 795201283Sjilles funcnest--; 7961556Srgrimes handler = savehandler; 7971556Srgrimes longjmp(handler->loc, 1); 7981556Srgrimes } 7991556Srgrimes handler = &jmploc; 800201283Sjilles funcnest++; 801199660Sjilles INTON; 8021556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 8031556Srgrimes mklocal(sp->text); 804185231Sstefanf exitstatus = oexitstatus; 80535675Scracauer if (flags & EV_TESTED) 806196634Sjilles evaltree(getfuncnode(cmdentry.u.func), EV_TESTED); 80735675Scracauer else 808196634Sjilles evaltree(getfuncnode(cmdentry.u.func), 0); 8091556Srgrimes INTOFF; 810196483Sjilles unreffunc(cmdentry.u.func); 8111556Srgrimes poplocalvars(); 8121556Srgrimes localvars = savelocalvars; 8131556Srgrimes freeparam(&shellparam); 8141556Srgrimes shellparam = saveparam; 8151556Srgrimes handler = savehandler; 816201283Sjilles funcnest--; 8171556Srgrimes popredir(); 8181556Srgrimes INTON; 8191556Srgrimes if (evalskip == SKIPFUNC) { 8201556Srgrimes evalskip = 0; 8211556Srgrimes skipcount = 0; 8221556Srgrimes } 8231556Srgrimes if (flags & EV_EXIT) 8241556Srgrimes exitshell(exitstatus); 8251556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 82620425Ssteve#ifdef DEBUG 8271556Srgrimes trputs("builtin command: "); trargs(argv); 82820425Ssteve#endif 8291556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 8301556Srgrimes if (flags == EV_BACKCMD) { 8311556Srgrimes memout.nleft = 0; 8321556Srgrimes memout.nextc = memout.buf; 8331556Srgrimes memout.bufsize = 64; 8341556Srgrimes mode |= REDIR_BACKQ; 8351556Srgrimes } 8361556Srgrimes savecmdname = commandname; 837199647Sjilles savetopfile = getcurrentfile(); 8381556Srgrimes cmdenviron = varlist.list; 8391556Srgrimes e = -1; 840194765Sjilles savehandler = handler; 8411556Srgrimes if (setjmp(jmploc.loc)) { 8421556Srgrimes e = exception; 8431556Srgrimes exitstatus = (e == EXINT)? SIGINT+128 : 2; 8441556Srgrimes goto cmddone; 8451556Srgrimes } 8461556Srgrimes handler = &jmploc; 847157601Sstefanf redirect(cmd->ncmd.redirect, mode); 848157601Sstefanf if (cmdentry.special) 849157601Sstefanf listsetvar(cmdenviron); 8501556Srgrimes commandname = argv[0]; 8511556Srgrimes argptr = argv + 1; 852201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 853193169Sstefanf builtin_flags = flags; 8541556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 8551556Srgrimes flushall(); 8561556Srgrimescmddone: 85760592Scracauer cmdenviron = NULL; 8581556Srgrimes out1 = &output; 8591556Srgrimes out2 = &errout; 8601556Srgrimes freestdout(); 8611556Srgrimes if (e != EXSHELLPROC) { 8621556Srgrimes commandname = savecmdname; 8631556Srgrimes if (flags & EV_EXIT) { 8641556Srgrimes exitshell(exitstatus); 8651556Srgrimes } 8661556Srgrimes } 8671556Srgrimes handler = savehandler; 8681556Srgrimes if (e != -1) { 86920425Ssteve if ((e != EXERROR && e != EXEXEC) 870157601Sstefanf || cmdentry.special) 8711556Srgrimes exraise(e); 872199647Sjilles popfilesupto(savetopfile); 8731556Srgrimes FORCEINTON; 8741556Srgrimes } 8751556Srgrimes if (cmdentry.u.index != EXECCMD) 8761556Srgrimes popredir(); 8771556Srgrimes if (flags == EV_BACKCMD) { 8781556Srgrimes backcmd->buf = memout.buf; 8791556Srgrimes backcmd->nleft = memout.nextc - memout.buf; 8801556Srgrimes memout.buf = NULL; 8811556Srgrimes } 8821556Srgrimes } else { 88320425Ssteve#ifdef DEBUG 8841556Srgrimes trputs("normal command: "); trargs(argv); 88520425Ssteve#endif 8861556Srgrimes redirect(cmd->ncmd.redirect, 0); 8871556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 8881556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 8891556Srgrimes envp = environment(); 89017987Speter shellexec(argv, envp, pathval(), cmdentry.u.index); 8911556Srgrimes /*NOTREACHED*/ 8921556Srgrimes } 8931556Srgrimes goto out; 8941556Srgrimes 8951556Srgrimesparent: /* parent process gets here (if we forked) */ 8961556Srgrimes if (mode == 0) { /* argument to fork */ 8971556Srgrimes INTOFF; 89845916Scracauer exitstatus = waitforjob(jp, &realstatus); 8991556Srgrimes INTON; 90045916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 90145266Scracauer evalskip = SKIPBREAK; 90245266Scracauer skipcount = loopnest; 90345266Scracauer } 9041556Srgrimes } else if (mode == 2) { 9051556Srgrimes backcmd->fd = pip[0]; 9061556Srgrimes close(pip[1]); 9071556Srgrimes backcmd->jp = jp; 9081556Srgrimes } 9091556Srgrimes 9101556Srgrimesout: 9111556Srgrimes if (lastarg) 9121556Srgrimes setvar("_", lastarg, 0); 91354884Scracauer if (do_clearcmdentry) 91454884Scracauer clearcmdentry(0); 9151556Srgrimes popstackmark(&smark); 9161556Srgrimes} 9171556Srgrimes 9181556Srgrimes 9191556Srgrimes 9201556Srgrimes/* 9211556Srgrimes * Search for a command. This is called before we fork so that the 9221556Srgrimes * location of the command will be available in the parent as well as 9231556Srgrimes * the child. The check for "goodname" is an overly conservative 9241556Srgrimes * check that the name will not be subject to expansion. 9251556Srgrimes */ 9261556Srgrimes 9271556SrgrimesSTATIC void 92890111Simpprehash(union node *n) 92917987Speter{ 9301556Srgrimes struct cmdentry entry; 9311556Srgrimes 932159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 93317987Speter if (goodname(n->ncmd.args->narg.text)) 93417987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 93517987Speter pathval()); 9361556Srgrimes} 9371556Srgrimes 9381556Srgrimes 9391556Srgrimes 9401556Srgrimes/* 9411556Srgrimes * Builtin commands. Builtin commands whose functions are closely 9421556Srgrimes * tied to evaluation are implemented here. 9431556Srgrimes */ 9441556Srgrimes 9451556Srgrimes/* 946157601Sstefanf * No command given, or a bltin command with no arguments. 9471556Srgrimes */ 9481556Srgrimes 94917987Speterint 95090111Simpbltincmd(int argc __unused, char **argv __unused) 95117987Speter{ 95220425Ssteve /* 95317987Speter * Preserve exitstatus of a previous possible redirection 95420425Ssteve * as POSIX mandates 95517987Speter */ 9561556Srgrimes return exitstatus; 9571556Srgrimes} 9581556Srgrimes 9591556Srgrimes 9601556Srgrimes/* 9611556Srgrimes * Handle break and continue commands. Break, continue, and return are 9621556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 9631556Srgrimes * above all check this flag, and if it is set they start skipping 9641556Srgrimes * commands rather than executing them. The variable skipcount is 9651556Srgrimes * the number of loops to break/continue, or the number of function 9661556Srgrimes * levels to return. (The latter is always 1.) It should probably 9671556Srgrimes * be an error to break out of more loops than exist, but it isn't 9681556Srgrimes * in the standard shell so we don't make it one here. 9691556Srgrimes */ 9701556Srgrimes 97117987Speterint 97290111Simpbreakcmd(int argc, char **argv) 97317987Speter{ 97420425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 9751556Srgrimes 9761556Srgrimes if (n > loopnest) 9771556Srgrimes n = loopnest; 9781556Srgrimes if (n > 0) { 9791556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 9801556Srgrimes skipcount = n; 9811556Srgrimes } 9821556Srgrimes return 0; 9831556Srgrimes} 9841556Srgrimes 985100437Stjr/* 986100437Stjr * The `command' command. 987100437Stjr */ 988100437Stjrint 989100437Stjrcommandcmd(int argc, char **argv) 990100437Stjr{ 991100437Stjr static char stdpath[] = _PATH_STDPATH; 992100437Stjr struct jmploc loc, *old; 993100437Stjr struct strlist *sp; 994100437Stjr char *path; 995100437Stjr int ch; 996151810Sstefanf int cmd = -1; 9971556Srgrimes 998100437Stjr for (sp = cmdenviron; sp ; sp = sp->next) 999100437Stjr setvareq(sp->text, VEXPORT|VSTACK); 1000100437Stjr path = pathval(); 1001100437Stjr 1002100437Stjr optind = optreset = 1; 1003100663Stjr opterr = 0; 1004151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 1005100437Stjr switch (ch) { 1006100437Stjr case 'p': 1007100437Stjr path = stdpath; 1008100437Stjr break; 1009151810Sstefanf case 'v': 1010151810Sstefanf cmd = TYPECMD_SMALLV; 1011151810Sstefanf break; 1012151810Sstefanf case 'V': 1013151810Sstefanf cmd = TYPECMD_BIGV; 1014151810Sstefanf break; 1015100437Stjr case '?': 1016100437Stjr default: 1017100437Stjr error("unknown option: -%c", optopt); 1018100437Stjr } 1019100437Stjr } 1020100437Stjr argc -= optind; 1021100437Stjr argv += optind; 1022100437Stjr 1023151810Sstefanf if (cmd != -1) { 1024151810Sstefanf if (argc != 1) 1025151810Sstefanf error("wrong number of arguments"); 1026201343Sjilles return typecmd_impl(2, argv - 1, cmd, path); 1027151810Sstefanf } 1028100437Stjr if (argc != 0) { 1029100437Stjr old = handler; 1030100437Stjr handler = &loc; 1031100437Stjr if (setjmp(handler->loc) == 0) 1032100437Stjr shellexec(argv, environment(), path, 0); 1033100437Stjr handler = old; 1034100437Stjr if (exception == EXEXEC) 1035100437Stjr exit(exerrno); 1036100437Stjr exraise(exception); 1037100437Stjr } 1038100437Stjr 1039100437Stjr /* 1040100437Stjr * Do nothing successfully if no command was specified; 1041100437Stjr * ksh also does this. 1042100437Stjr */ 1043100437Stjr exit(0); 1044100437Stjr} 1045100437Stjr 1046100437Stjr 10471556Srgrimes/* 10481556Srgrimes * The return command. 10491556Srgrimes */ 10501556Srgrimes 105117987Speterint 105290111Simpreturncmd(int argc, char **argv) 105317987Speter{ 105420425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 10551556Srgrimes 10561556Srgrimes if (funcnest) { 10571556Srgrimes evalskip = SKIPFUNC; 10581556Srgrimes skipcount = 1; 105920425Ssteve } else { 106020425Ssteve /* skip the rest of the file */ 106120425Ssteve evalskip = SKIPFILE; 106220425Ssteve skipcount = 1; 10631556Srgrimes } 10641556Srgrimes return ret; 10651556Srgrimes} 10661556Srgrimes 10671556Srgrimes 106817987Speterint 106990111Simpfalsecmd(int argc __unused, char **argv __unused) 107017987Speter{ 107117987Speter return 1; 107217987Speter} 107317987Speter 107417987Speter 107517987Speterint 107690111Simptruecmd(int argc __unused, char **argv __unused) 107717987Speter{ 10781556Srgrimes return 0; 10791556Srgrimes} 10801556Srgrimes 10811556Srgrimes 108217987Speterint 108390111Simpexeccmd(int argc, char **argv) 108417987Speter{ 10851556Srgrimes if (argc > 1) { 108617987Speter struct strlist *sp; 108717987Speter 10881556Srgrimes iflag = 0; /* exit on error */ 10891556Srgrimes mflag = 0; 10901556Srgrimes optschanged(); 109117987Speter for (sp = cmdenviron; sp ; sp = sp->next) 109217987Speter setvareq(sp->text, VEXPORT|VSTACK); 10931556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 10941556Srgrimes 10951556Srgrimes } 10961556Srgrimes return 0; 10971556Srgrimes} 1098153091Sstefanf 1099153091Sstefanf 1100153091Sstefanfint 1101153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1102153091Sstefanf{ 1103153091Sstefanf struct rusage ru; 1104153091Sstefanf long shumins, shsmins, chumins, chsmins; 1105153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1106153091Sstefanf 1107153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1108153091Sstefanf return 1; 1109153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1110153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1111153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1112153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1113153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1114153091Sstefanf return 1; 1115153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1116153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1117153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1118153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1119153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1120153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1121153091Sstefanf return 0; 1122153091Sstefanf} 1123