eval.c revision 194128
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 194128 2009-06-13 21:17:45Z 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 771556SrgrimesMKINIT int 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); 4041556Srgrimes jp = makejob(n, 1); 4051556Srgrimes if (forkshell(jp, 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 */ 4101556Srgrimes } 4111556Srgrimes if (! backgnd) { 4121556Srgrimes INTOFF; 41345916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4141556Srgrimes INTON; 4151556Srgrimes } 4161556Srgrimes} 4171556Srgrimes 4181556Srgrimes 4191556Srgrimes 4201556Srgrimes/* 4211556Srgrimes * Compute the names of the files in a redirection list. 4221556Srgrimes */ 4231556Srgrimes 4241556SrgrimesSTATIC void 42590111Simpexpredir(union node *n) 42617987Speter{ 42725222Ssteve union node *redir; 4281556Srgrimes 4291556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 43017987Speter struct arglist fn; 43117987Speter fn.lastp = &fn.list; 43217987Speter oexitstatus = exitstatus; 43317987Speter switch (redir->type) { 43417987Speter case NFROM: 43517987Speter case NTO: 43666612Sbrian case NFROMTO: 43717987Speter case NAPPEND: 43896922Stjr case NCLOBBER: 4391556Srgrimes expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 4401556Srgrimes redir->nfile.expfname = fn.list->text; 44117987Speter break; 44217987Speter case NFROMFD: 44317987Speter case NTOFD: 44417987Speter if (redir->ndup.vname) { 445181017Sstefanf expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 44617987Speter fixredir(redir, fn.list->text, 1); 44717987Speter } 44817987Speter break; 4491556Srgrimes } 4501556Srgrimes } 4511556Srgrimes} 4521556Srgrimes 4531556Srgrimes 4541556Srgrimes 4551556Srgrimes/* 4561556Srgrimes * Evaluate a pipeline. All the processes in the pipeline are children 4571556Srgrimes * of the process creating the pipeline. (This differs from some versions 4581556Srgrimes * of the shell, which make the last process in a pipeline the parent 4591556Srgrimes * of all the rest.) 4601556Srgrimes */ 4611556Srgrimes 4621556SrgrimesSTATIC void 46390111Simpevalpipe(union node *n) 46417987Speter{ 4651556Srgrimes struct job *jp; 4661556Srgrimes struct nodelist *lp; 4671556Srgrimes int pipelen; 4681556Srgrimes int prevfd; 4691556Srgrimes int pip[2]; 4701556Srgrimes 471149802Sstefanf TRACE(("evalpipe(%p) called\n", (void *)n)); 4721556Srgrimes pipelen = 0; 4731556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 4741556Srgrimes pipelen++; 4751556Srgrimes INTOFF; 4761556Srgrimes jp = makejob(n, pipelen); 4771556Srgrimes prevfd = -1; 4781556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 4791556Srgrimes prehash(lp->n); 4801556Srgrimes pip[1] = -1; 4811556Srgrimes if (lp->next) { 4821556Srgrimes if (pipe(pip) < 0) { 4831556Srgrimes close(prevfd); 48453891Scracauer error("Pipe call failed: %s", strerror(errno)); 4851556Srgrimes } 4861556Srgrimes } 4871556Srgrimes if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 4881556Srgrimes INTON; 4891556Srgrimes if (prevfd > 0) { 490124780Sdes dup2(prevfd, 0); 4911556Srgrimes close(prevfd); 4921556Srgrimes } 4931556Srgrimes if (pip[1] >= 0) { 49453282Scracauer if (!(prevfd >= 0 && pip[0] == 0)) 49552900Scracauer close(pip[0]); 4961556Srgrimes if (pip[1] != 1) { 497124780Sdes dup2(pip[1], 1); 4981556Srgrimes close(pip[1]); 4991556Srgrimes } 5001556Srgrimes } 5011556Srgrimes evaltree(lp->n, EV_EXIT); 5021556Srgrimes } 5031556Srgrimes if (prevfd >= 0) 5041556Srgrimes close(prevfd); 5051556Srgrimes prevfd = pip[0]; 5061556Srgrimes close(pip[1]); 5071556Srgrimes } 5081556Srgrimes INTON; 5091556Srgrimes if (n->npipe.backgnd == 0) { 5101556Srgrimes INTOFF; 51145916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 5121556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 5131556Srgrimes INTON; 5141556Srgrimes } 5151556Srgrimes} 5161556Srgrimes 5171556Srgrimes 5181556Srgrimes 5191556Srgrimes/* 5201556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 5211556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 5221556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 5231556Srgrimes * Should be called with interrupts off. 5241556Srgrimes */ 5251556Srgrimes 5261556Srgrimesvoid 52790111Simpevalbackcmd(union node *n, struct backcmd *result) 52817987Speter{ 5291556Srgrimes int pip[2]; 5301556Srgrimes struct job *jp; 5311556Srgrimes struct stackmark smark; /* unnecessary */ 5321556Srgrimes 5331556Srgrimes setstackmark(&smark); 5341556Srgrimes result->fd = -1; 5351556Srgrimes result->buf = NULL; 5361556Srgrimes result->nleft = 0; 5371556Srgrimes result->jp = NULL; 53817987Speter if (n == NULL) { 53917987Speter exitstatus = 0; 5401556Srgrimes goto out; 54117987Speter } 5421556Srgrimes if (n->type == NCMD) { 54317987Speter exitstatus = oexitstatus; 5441556Srgrimes evalcommand(n, EV_BACKCMD, result); 5451556Srgrimes } else { 54617987Speter exitstatus = 0; 5471556Srgrimes if (pipe(pip) < 0) 54853891Scracauer error("Pipe call failed: %s", strerror(errno)); 5491556Srgrimes jp = makejob(n, 1); 5501556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 5511556Srgrimes FORCEINTON; 5521556Srgrimes close(pip[0]); 5531556Srgrimes if (pip[1] != 1) { 554124780Sdes dup2(pip[1], 1); 5551556Srgrimes close(pip[1]); 5561556Srgrimes } 5571556Srgrimes evaltree(n, EV_EXIT); 5581556Srgrimes } 5591556Srgrimes close(pip[1]); 5601556Srgrimes result->fd = pip[0]; 5611556Srgrimes result->jp = jp; 5621556Srgrimes } 5631556Srgrimesout: 5641556Srgrimes popstackmark(&smark); 565109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 5661556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 5671556Srgrimes} 5681556Srgrimes 5691556Srgrimes 5701556Srgrimes 5711556Srgrimes/* 5721556Srgrimes * Execute a simple command. 5731556Srgrimes */ 5741556Srgrimes 5751556SrgrimesSTATIC void 57690111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 57717987Speter{ 5781556Srgrimes struct stackmark smark; 5791556Srgrimes union node *argp; 5801556Srgrimes struct arglist arglist; 5811556Srgrimes struct arglist varlist; 5821556Srgrimes char **argv; 5831556Srgrimes int argc; 5841556Srgrimes char **envp; 5851556Srgrimes int varflag; 5861556Srgrimes struct strlist *sp; 5871556Srgrimes int mode; 5881556Srgrimes int pip[2]; 5891556Srgrimes struct cmdentry cmdentry; 5901556Srgrimes struct job *jp; 5911556Srgrimes struct jmploc jmploc; 5921556Srgrimes struct jmploc *volatile savehandler; 5931556Srgrimes char *volatile savecmdname; 5941556Srgrimes volatile struct shparam saveparam; 5951556Srgrimes struct localvar *volatile savelocalvars; 5961556Srgrimes volatile int e; 5971556Srgrimes char *lastarg; 59845916Scracauer int realstatus; 59954884Scracauer int do_clearcmdentry; 600193222Srse#ifdef __GNUC__ 60117987Speter /* Avoid longjmp clobbering */ 60217987Speter (void) &argv; 60317987Speter (void) &argc; 60417987Speter (void) &lastarg; 60517987Speter (void) &flags; 60654884Scracauer (void) &do_clearcmdentry; 60717987Speter#endif 6081556Srgrimes 6091556Srgrimes /* First expand the arguments. */ 610149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 6111556Srgrimes setstackmark(&smark); 6121556Srgrimes arglist.lastp = &arglist.list; 6131556Srgrimes varlist.lastp = &varlist.list; 6141556Srgrimes varflag = 1; 61554884Scracauer do_clearcmdentry = 0; 61617987Speter oexitstatus = exitstatus; 61717987Speter exitstatus = 0; 6181556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 61917987Speter char *p = argp->narg.text; 6201556Srgrimes if (varflag && is_name(*p)) { 6211556Srgrimes do { 6221556Srgrimes p++; 6231556Srgrimes } while (is_in_name(*p)); 6241556Srgrimes if (*p == '=') { 6251556Srgrimes expandarg(argp, &varlist, EXP_VARTILDE); 6261556Srgrimes continue; 6271556Srgrimes } 6281556Srgrimes } 6291556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 6301556Srgrimes varflag = 0; 6311556Srgrimes } 6321556Srgrimes *arglist.lastp = NULL; 6331556Srgrimes *varlist.lastp = NULL; 6341556Srgrimes expredir(cmd->ncmd.redirect); 6351556Srgrimes argc = 0; 6361556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 6371556Srgrimes argc++; 6381556Srgrimes argv = stalloc(sizeof (char *) * (argc + 1)); 6391556Srgrimes 6401556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 6411556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 6421556Srgrimes *argv++ = sp->text; 6431556Srgrimes } 6441556Srgrimes *argv = NULL; 6451556Srgrimes lastarg = NULL; 6461556Srgrimes if (iflag && funcnest == 0 && argc > 0) 6471556Srgrimes lastarg = argv[-1]; 6481556Srgrimes argv -= argc; 6491556Srgrimes 6501556Srgrimes /* Print the command if xflag is set. */ 6511556Srgrimes if (xflag) { 652159632Sstefanf char sep = 0; 653159632Sstefanf out2str(ps4val()); 6541556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 655159632Sstefanf if (sep != 0) 656159632Sstefanf outc(' ', &errout); 6571556Srgrimes out2str(sp->text); 658159632Sstefanf sep = ' '; 6591556Srgrimes } 6601556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 661159632Sstefanf if (sep != 0) 662159632Sstefanf outc(' ', &errout); 6631556Srgrimes out2str(sp->text); 664159632Sstefanf sep = ' '; 6651556Srgrimes } 6661556Srgrimes outc('\n', &errout); 6671556Srgrimes flushout(&errout); 6681556Srgrimes } 6691556Srgrimes 6701556Srgrimes /* Now locate the command. */ 6711556Srgrimes if (argc == 0) { 672157601Sstefanf /* Variable assignment(s) without command */ 6731556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 6741556Srgrimes cmdentry.u.index = BLTINCMD; 675157601Sstefanf cmdentry.special = 1; 6761556Srgrimes } else { 67717987Speter static const char PATH[] = "PATH="; 67817987Speter char *path = pathval(); 67917987Speter 68017987Speter /* 68117987Speter * Modify the command lookup path, if a PATH= assignment 68217987Speter * is present 68317987Speter */ 68417987Speter for (sp = varlist.list ; sp ; sp = sp->next) 68554884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 68617987Speter path = sp->text + sizeof(PATH) - 1; 687155301Sschweikh /* 68854884Scracauer * On `PATH=... command`, we need to make 68954884Scracauer * sure that the command isn't using the 69054884Scracauer * non-updated hash table of the outer PATH 691155301Sschweikh * setting and we need to make sure that 69254884Scracauer * the hash table isn't filled with items 69354884Scracauer * from the temporary setting. 69454884Scracauer * 695155301Sschweikh * It would be better to forbit using and 69654884Scracauer * updating the table while this command 69754884Scracauer * runs, by the command finding mechanism 69854884Scracauer * is heavily integrated with hash handling, 69954884Scracauer * so we just delete the hash before and after 70054884Scracauer * the command runs. Partly deleting like 70154884Scracauer * changepatch() does doesn't seem worth the 70254884Scracauer * bookinging effort, since most such runs add 703123996Smaxim * directories in front of the new PATH. 70454884Scracauer */ 70554884Scracauer clearcmdentry(0); 70654884Scracauer do_clearcmdentry = 1; 70754884Scracauer } 70817987Speter 70917987Speter find_command(argv[0], &cmdentry, 1, path); 7101556Srgrimes if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */ 71120425Ssteve exitstatus = 127; 7121556Srgrimes flushout(&errout); 7131556Srgrimes return; 7141556Srgrimes } 7151556Srgrimes /* implement the bltin builtin here */ 7161556Srgrimes if (cmdentry.cmdtype == CMDBUILTIN && cmdentry.u.index == BLTINCMD) { 7171556Srgrimes for (;;) { 7181556Srgrimes argv++; 7191556Srgrimes if (--argc == 0) 7201556Srgrimes break; 721157601Sstefanf if ((cmdentry.u.index = find_builtin(*argv, 722157601Sstefanf &cmdentry.special)) < 0) { 7231556Srgrimes outfmt(&errout, "%s: not found\n", *argv); 72420425Ssteve exitstatus = 127; 7251556Srgrimes flushout(&errout); 7261556Srgrimes return; 7271556Srgrimes } 7281556Srgrimes if (cmdentry.u.index != BLTINCMD) 7291556Srgrimes break; 7301556Srgrimes } 7311556Srgrimes } 7321556Srgrimes } 7331556Srgrimes 7341556Srgrimes /* Fork off a child process if necessary. */ 7351556Srgrimes if (cmd->ncmd.backgnd 73645221Scracauer || (cmdentry.cmdtype == CMDNORMAL 737194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 73817987Speter || ((flags & EV_BACKCMD) != 0 7391556Srgrimes && (cmdentry.cmdtype != CMDBUILTIN 74048896Ssheldonh || cmdentry.u.index == CDCMD 7411556Srgrimes || cmdentry.u.index == DOTCMD 742100437Stjr || cmdentry.u.index == EVALCMD)) 743100437Stjr || (cmdentry.cmdtype == CMDBUILTIN && 744100437Stjr cmdentry.u.index == COMMANDCMD)) { 7451556Srgrimes jp = makejob(cmd, 1); 7461556Srgrimes mode = cmd->ncmd.backgnd; 7471556Srgrimes if (flags & EV_BACKCMD) { 7481556Srgrimes mode = FORK_NOJOB; 7491556Srgrimes if (pipe(pip) < 0) 75053891Scracauer error("Pipe call failed: %s", strerror(errno)); 7511556Srgrimes } 7521556Srgrimes if (forkshell(jp, cmd, mode) != 0) 7531556Srgrimes goto parent; /* at end of routine */ 7541556Srgrimes if (flags & EV_BACKCMD) { 7551556Srgrimes FORCEINTON; 7561556Srgrimes close(pip[0]); 7571556Srgrimes if (pip[1] != 1) { 758124780Sdes dup2(pip[1], 1); 7591556Srgrimes close(pip[1]); 7601556Srgrimes } 7611556Srgrimes } 7621556Srgrimes flags |= EV_EXIT; 7631556Srgrimes } 7641556Srgrimes 7651556Srgrimes /* This is the child process if a fork occurred. */ 7661556Srgrimes /* Execute the command. */ 7671556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 76820425Ssteve#ifdef DEBUG 7691556Srgrimes trputs("Shell function: "); trargs(argv); 77020425Ssteve#endif 7711556Srgrimes redirect(cmd->ncmd.redirect, REDIR_PUSH); 7721556Srgrimes saveparam = shellparam; 7731556Srgrimes shellparam.malloc = 0; 77420425Ssteve shellparam.reset = 1; 7751556Srgrimes shellparam.nparam = argc - 1; 7761556Srgrimes shellparam.p = argv + 1; 7771556Srgrimes shellparam.optnext = NULL; 7781556Srgrimes INTOFF; 7791556Srgrimes savelocalvars = localvars; 7801556Srgrimes localvars = NULL; 7811556Srgrimes INTON; 7821556Srgrimes if (setjmp(jmploc.loc)) { 7831556Srgrimes if (exception == EXSHELLPROC) 7841556Srgrimes freeparam((struct shparam *)&saveparam); 7851556Srgrimes else { 7861556Srgrimes freeparam(&shellparam); 7871556Srgrimes shellparam = saveparam; 7881556Srgrimes } 7891556Srgrimes poplocalvars(); 7901556Srgrimes localvars = savelocalvars; 7911556Srgrimes handler = savehandler; 7921556Srgrimes longjmp(handler->loc, 1); 7931556Srgrimes } 7941556Srgrimes savehandler = handler; 7951556Srgrimes handler = &jmploc; 7961556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 7971556Srgrimes mklocal(sp->text); 7981556Srgrimes funcnest++; 799185231Sstefanf exitstatus = oexitstatus; 80035675Scracauer if (flags & EV_TESTED) 80135675Scracauer evaltree(cmdentry.u.func, EV_TESTED); 80235675Scracauer else 80335675Scracauer evaltree(cmdentry.u.func, 0); 8041556Srgrimes funcnest--; 8051556Srgrimes INTOFF; 8061556Srgrimes poplocalvars(); 8071556Srgrimes localvars = savelocalvars; 8081556Srgrimes freeparam(&shellparam); 8091556Srgrimes shellparam = saveparam; 8101556Srgrimes handler = savehandler; 8111556Srgrimes popredir(); 8121556Srgrimes INTON; 8131556Srgrimes if (evalskip == SKIPFUNC) { 8141556Srgrimes evalskip = 0; 8151556Srgrimes skipcount = 0; 8161556Srgrimes } 8171556Srgrimes if (flags & EV_EXIT) 8181556Srgrimes exitshell(exitstatus); 8191556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 82020425Ssteve#ifdef DEBUG 8211556Srgrimes trputs("builtin command: "); trargs(argv); 82220425Ssteve#endif 8231556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 8241556Srgrimes if (flags == EV_BACKCMD) { 8251556Srgrimes memout.nleft = 0; 8261556Srgrimes memout.nextc = memout.buf; 8271556Srgrimes memout.bufsize = 64; 8281556Srgrimes mode |= REDIR_BACKQ; 8291556Srgrimes } 8301556Srgrimes savecmdname = commandname; 8311556Srgrimes cmdenviron = varlist.list; 8321556Srgrimes e = -1; 8331556Srgrimes if (setjmp(jmploc.loc)) { 8341556Srgrimes e = exception; 8351556Srgrimes exitstatus = (e == EXINT)? SIGINT+128 : 2; 8361556Srgrimes goto cmddone; 8371556Srgrimes } 8381556Srgrimes savehandler = handler; 8391556Srgrimes handler = &jmploc; 840157601Sstefanf redirect(cmd->ncmd.redirect, mode); 841157601Sstefanf if (cmdentry.special) 842157601Sstefanf listsetvar(cmdenviron); 8431556Srgrimes commandname = argv[0]; 8441556Srgrimes argptr = argv + 1; 8451556Srgrimes optptr = NULL; /* initialize nextopt */ 846193169Sstefanf builtin_flags = flags; 8471556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 8481556Srgrimes flushall(); 8491556Srgrimescmddone: 85060592Scracauer cmdenviron = NULL; 8511556Srgrimes out1 = &output; 8521556Srgrimes out2 = &errout; 8531556Srgrimes freestdout(); 8541556Srgrimes if (e != EXSHELLPROC) { 8551556Srgrimes commandname = savecmdname; 8561556Srgrimes if (flags & EV_EXIT) { 8571556Srgrimes exitshell(exitstatus); 8581556Srgrimes } 8591556Srgrimes } 8601556Srgrimes handler = savehandler; 8611556Srgrimes if (e != -1) { 86220425Ssteve if ((e != EXERROR && e != EXEXEC) 863157601Sstefanf || cmdentry.special) 8641556Srgrimes exraise(e); 8651556Srgrimes FORCEINTON; 8661556Srgrimes } 8671556Srgrimes if (cmdentry.u.index != EXECCMD) 8681556Srgrimes popredir(); 8691556Srgrimes if (flags == EV_BACKCMD) { 8701556Srgrimes backcmd->buf = memout.buf; 8711556Srgrimes backcmd->nleft = memout.nextc - memout.buf; 8721556Srgrimes memout.buf = NULL; 8731556Srgrimes } 8741556Srgrimes } else { 87520425Ssteve#ifdef DEBUG 8761556Srgrimes trputs("normal command: "); trargs(argv); 87720425Ssteve#endif 8781556Srgrimes clearredir(); 8791556Srgrimes redirect(cmd->ncmd.redirect, 0); 8801556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 8811556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 8821556Srgrimes envp = environment(); 88317987Speter shellexec(argv, envp, pathval(), cmdentry.u.index); 8841556Srgrimes /*NOTREACHED*/ 8851556Srgrimes } 8861556Srgrimes goto out; 8871556Srgrimes 8881556Srgrimesparent: /* parent process gets here (if we forked) */ 8891556Srgrimes if (mode == 0) { /* argument to fork */ 8901556Srgrimes INTOFF; 89145916Scracauer exitstatus = waitforjob(jp, &realstatus); 8921556Srgrimes INTON; 89345916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 89445266Scracauer evalskip = SKIPBREAK; 89545266Scracauer skipcount = loopnest; 89645266Scracauer } 8971556Srgrimes } else if (mode == 2) { 8981556Srgrimes backcmd->fd = pip[0]; 8991556Srgrimes close(pip[1]); 9001556Srgrimes backcmd->jp = jp; 9011556Srgrimes } 9021556Srgrimes 9031556Srgrimesout: 9041556Srgrimes if (lastarg) 9051556Srgrimes setvar("_", lastarg, 0); 90654884Scracauer if (do_clearcmdentry) 90754884Scracauer clearcmdentry(0); 9081556Srgrimes popstackmark(&smark); 9091556Srgrimes} 9101556Srgrimes 9111556Srgrimes 9121556Srgrimes 9131556Srgrimes/* 9141556Srgrimes * Search for a command. This is called before we fork so that the 9151556Srgrimes * location of the command will be available in the parent as well as 9161556Srgrimes * the child. The check for "goodname" is an overly conservative 9171556Srgrimes * check that the name will not be subject to expansion. 9181556Srgrimes */ 9191556Srgrimes 9201556SrgrimesSTATIC void 92190111Simpprehash(union node *n) 92217987Speter{ 9231556Srgrimes struct cmdentry entry; 9241556Srgrimes 925159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 92617987Speter if (goodname(n->ncmd.args->narg.text)) 92717987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 92817987Speter pathval()); 9291556Srgrimes} 9301556Srgrimes 9311556Srgrimes 9321556Srgrimes 9331556Srgrimes/* 9341556Srgrimes * Builtin commands. Builtin commands whose functions are closely 9351556Srgrimes * tied to evaluation are implemented here. 9361556Srgrimes */ 9371556Srgrimes 9381556Srgrimes/* 939157601Sstefanf * No command given, or a bltin command with no arguments. 9401556Srgrimes */ 9411556Srgrimes 94217987Speterint 94390111Simpbltincmd(int argc __unused, char **argv __unused) 94417987Speter{ 94520425Ssteve /* 94617987Speter * Preserve exitstatus of a previous possible redirection 94720425Ssteve * as POSIX mandates 94817987Speter */ 9491556Srgrimes return exitstatus; 9501556Srgrimes} 9511556Srgrimes 9521556Srgrimes 9531556Srgrimes/* 9541556Srgrimes * Handle break and continue commands. Break, continue, and return are 9551556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 9561556Srgrimes * above all check this flag, and if it is set they start skipping 9571556Srgrimes * commands rather than executing them. The variable skipcount is 9581556Srgrimes * the number of loops to break/continue, or the number of function 9591556Srgrimes * levels to return. (The latter is always 1.) It should probably 9601556Srgrimes * be an error to break out of more loops than exist, but it isn't 9611556Srgrimes * in the standard shell so we don't make it one here. 9621556Srgrimes */ 9631556Srgrimes 96417987Speterint 96590111Simpbreakcmd(int argc, char **argv) 96617987Speter{ 96720425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 9681556Srgrimes 9691556Srgrimes if (n > loopnest) 9701556Srgrimes n = loopnest; 9711556Srgrimes if (n > 0) { 9721556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 9731556Srgrimes skipcount = n; 9741556Srgrimes } 9751556Srgrimes return 0; 9761556Srgrimes} 9771556Srgrimes 978100437Stjr/* 979100437Stjr * The `command' command. 980100437Stjr */ 981100437Stjrint 982100437Stjrcommandcmd(int argc, char **argv) 983100437Stjr{ 984100437Stjr static char stdpath[] = _PATH_STDPATH; 985100437Stjr struct jmploc loc, *old; 986100437Stjr struct strlist *sp; 987100437Stjr char *path; 988100437Stjr int ch; 989151810Sstefanf int cmd = -1; 9901556Srgrimes 991100437Stjr for (sp = cmdenviron; sp ; sp = sp->next) 992100437Stjr setvareq(sp->text, VEXPORT|VSTACK); 993100437Stjr path = pathval(); 994100437Stjr 995100437Stjr optind = optreset = 1; 996100663Stjr opterr = 0; 997151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 998100437Stjr switch (ch) { 999100437Stjr case 'p': 1000100437Stjr path = stdpath; 1001100437Stjr break; 1002151810Sstefanf case 'v': 1003151810Sstefanf cmd = TYPECMD_SMALLV; 1004151810Sstefanf break; 1005151810Sstefanf case 'V': 1006151810Sstefanf cmd = TYPECMD_BIGV; 1007151810Sstefanf break; 1008100437Stjr case '?': 1009100437Stjr default: 1010100437Stjr error("unknown option: -%c", optopt); 1011100437Stjr } 1012100437Stjr } 1013100437Stjr argc -= optind; 1014100437Stjr argv += optind; 1015100437Stjr 1016151810Sstefanf if (cmd != -1) { 1017151810Sstefanf if (argc != 1) 1018151810Sstefanf error("wrong number of arguments"); 1019151810Sstefanf return typecmd_impl(2, argv - 1, cmd); 1020151810Sstefanf } 1021100437Stjr if (argc != 0) { 1022100437Stjr old = handler; 1023100437Stjr handler = &loc; 1024100437Stjr if (setjmp(handler->loc) == 0) 1025100437Stjr shellexec(argv, environment(), path, 0); 1026100437Stjr handler = old; 1027100437Stjr if (exception == EXEXEC) 1028100437Stjr exit(exerrno); 1029100437Stjr exraise(exception); 1030100437Stjr } 1031100437Stjr 1032100437Stjr /* 1033100437Stjr * Do nothing successfully if no command was specified; 1034100437Stjr * ksh also does this. 1035100437Stjr */ 1036100437Stjr exit(0); 1037100437Stjr} 1038100437Stjr 1039100437Stjr 10401556Srgrimes/* 10411556Srgrimes * The return command. 10421556Srgrimes */ 10431556Srgrimes 104417987Speterint 104590111Simpreturncmd(int argc, char **argv) 104617987Speter{ 104720425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 10481556Srgrimes 10491556Srgrimes if (funcnest) { 10501556Srgrimes evalskip = SKIPFUNC; 10511556Srgrimes skipcount = 1; 105220425Ssteve } else { 105320425Ssteve /* skip the rest of the file */ 105420425Ssteve evalskip = SKIPFILE; 105520425Ssteve skipcount = 1; 10561556Srgrimes } 10571556Srgrimes return ret; 10581556Srgrimes} 10591556Srgrimes 10601556Srgrimes 106117987Speterint 106290111Simpfalsecmd(int argc __unused, char **argv __unused) 106317987Speter{ 106417987Speter return 1; 106517987Speter} 106617987Speter 106717987Speter 106817987Speterint 106990111Simptruecmd(int argc __unused, char **argv __unused) 107017987Speter{ 10711556Srgrimes return 0; 10721556Srgrimes} 10731556Srgrimes 10741556Srgrimes 107517987Speterint 107690111Simpexeccmd(int argc, char **argv) 107717987Speter{ 10781556Srgrimes if (argc > 1) { 107917987Speter struct strlist *sp; 108017987Speter 10811556Srgrimes iflag = 0; /* exit on error */ 10821556Srgrimes mflag = 0; 10831556Srgrimes optschanged(); 108417987Speter for (sp = cmdenviron; sp ; sp = sp->next) 108517987Speter setvareq(sp->text, VEXPORT|VSTACK); 10861556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 10871556Srgrimes 10881556Srgrimes } 10891556Srgrimes return 0; 10901556Srgrimes} 1091153091Sstefanf 1092153091Sstefanf 1093153091Sstefanfint 1094153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1095153091Sstefanf{ 1096153091Sstefanf struct rusage ru; 1097153091Sstefanf long shumins, shsmins, chumins, chsmins; 1098153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1099153091Sstefanf 1100153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1101153091Sstefanf return 1; 1102153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1103153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1104153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1105153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1106153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1107153091Sstefanf return 1; 1108153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1109153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1110153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1111153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1112153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1113153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1114153091Sstefanf return 0; 1115153091Sstefanf} 1116