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exec.c
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/*
* $Id: exec.c,v 2.93 1996/10/15 20:16:35 hzoli Exp $
*
* exec.c - command execution
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1996 Paul Falstad
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
/*
This special version of exec.c includes changes which are part of Event_Logger,
author Amacri - [email protected]
Please, check Event_Logger license and related terms and conditions.
*/
#include "zsh.h"
#define execerr() if (!forked) { lastval = 1; return; } else _exit(1)
static LinkList args;
static int doneps4;
extern long ForkCounter, Nice;
/* parse string into a list */
/**/
List
parse_string(char *s)
{
List l;
lexsave();
inpush(s, 0, NULL);
strinbeg();
stophist = 2;
l = parse_list();
strinend();
inpop();
lexrestore();
return l;
}
#ifdef HAVE_GETRLIMIT
/**/
int
zsetlimit(int limnum, char *nam)
{
if (limits[limnum].rlim_max != current_limits[limnum].rlim_max ||
limits[limnum].rlim_cur != current_limits[limnum].rlim_cur) {
if (setrlimit(limnum, limits + limnum)) {
if (nam)
zwarnnam(nam, "setrlimit failed: %e", NULL, errno);
return -1;
}
current_limits[limnum] = limits[limnum];
}
return 0;
}
/**/
int
setlimits(char *nam)
{
int limnum;
int ret = 0;
for (limnum = 0; limnum < RLIM_NLIMITS; limnum++)
if (zsetlimit(limnum, nam))
ret++;
return ret;
}
#endif
/* fork and set limits */
/**/
pid_t
zfork(void)
{
pid_t pid;
if (thisjob >= MAXJOB - 1) {
zerr("job table full", NULL, 0);
return -1;
}
pid = fork();
if (pid == -1) {
zerr("fork failed: %e", NULL, errno);
return -1;
}
#ifdef HAVE_GETRLIMIT
if (!pid)
/* set resource limits for the child process */
setlimits(NULL);
#endif
return pid;
}
int list_pipe = 0, simple_pline = 0;
static pid_t list_pipe_pid;
static int nowait, pline_level = 0;
static int list_pipe_child = 0, list_pipe_job;
static char list_pipe_text[JOBTEXTSIZE];
/* execute a current shell command */
/**/
int
execcursh(Cmd cmd)
{
if (!list_pipe)
deletejob(jobtab + thisjob);
execlist(cmd->u.list, 1, cmd->flags & CFLAG_EXEC);
cmd->u.list = NULL;
return lastval;
}
/* execve after handling $_ and #! */
#define POUNDBANGLIMIT 64
/**/
int
zexecve(char *pth, char **argv)
{
int eno;
static char buf[PATH_MAX * 2];
char **eep;
unmetafy(pth, NULL);
for (eep = argv; *eep; eep++)
if (*eep != pth)
unmetafy(*eep, NULL);
for (eep = environ; *eep; eep++)
if (**eep == '_' && (*eep)[1] == '=')
break;
buf[0] = '_';
buf[1] = '=';
if (*pth == '/')
strcpy(buf + 2, pth);
else
sprintf(buf + 2, "%s/%s", pwd, pth);
if (!*eep)
eep[1] = NULL;
*eep = buf;
execve(pth, argv, environ);
/* If the execve returns (which in general shouldn't happen), *
* then check for an errno equal to ENOEXEC. This errno is set *
* if the process file has the appropriate access permission, *
* but has an invalid magic number in its header. */
if ((eno = errno) == ENOEXEC) {
char execvebuf[POUNDBANGLIMIT + 1], *ptr, *ptr2, *argv0;
int fd, ct, t0;
if ((fd = open(pth, O_RDONLY)) >= 0) {
argv0 = *argv;
*argv = pth;
ct = read(fd, execvebuf, POUNDBANGLIMIT);
close(fd);
if (ct > 0) {
if (execvebuf[0] == '#') {
if (execvebuf[1] == '!') {
for (t0 = 0; t0 != ct; t0++)
if (execvebuf[t0] == '\n')
execvebuf[t0] = '\0';
execvebuf[POUNDBANGLIMIT] = '\0';
for (ptr = execvebuf + 2; *ptr && *ptr == ' '; ptr++);
for (ptr2 = ptr; *ptr && *ptr != ' '; ptr++);
if (*ptr) {
*ptr = '\0';
argv[-2] = ptr2;
argv[-1] = ptr + 1;
execve(ptr2, argv - 2, environ);
} else {
argv[-1] = ptr2;
execve(ptr2, argv - 1, environ);
}
} else {
argv[-1] = "sh";
execve("/bin/sh", argv - 1, environ);
}
} else {
for (t0 = 0; t0 != ct; t0++)
if (!execvebuf[t0])
break;
if (t0 == ct) {
argv[-1] = "sh";
execve("/bin/sh", argv - 1, environ);
}
}
} else
eno = errno;
*argv = argv0;
} else
eno = errno;
}
/* restore the original arguments and path but do not bother with *
* null characters as these cannot be passed to external commands *
* anyway. So the result is truncated at the first null char. */
pth = metafy(pth, -1, META_NOALLOC);
for (eep = argv; *eep; eep++)
if (*eep != pth)
(void) metafy(*eep, -1, META_NOALLOC);
return eno;
}
#define MAXCMDLEN (PATH_MAX*4)
/* test whether we really want to believe the error number */
/**/
int
isgooderr(int e, char *dir)
{
/*
* Maybe the directory was unreadable, or maybe it wasn't
* even a directory.
*/
return ((e != EACCES || !access(dir, X_OK)) &&
e != ENOENT && e != ENOTDIR);
}
/* execute an external command */
/**/
void
execute(Cmdnam not_used_yet, int dash)
{
Cmdnam cn;
static LinkList exargs;
char buf[MAXCMDLEN], buf2[MAXCMDLEN];
char *s, *z, *arg0;
char **argv, **pp;
int eno = 0, ee;
/* If the parameter STTY is set in the command's environment, *
* we first run the stty command with the value of this *
* parameter as it arguments. */
if (!exargs && (s = zgetenv("STTY")) && isatty(0)) {
char *t;
exargs = args; /* this prevents infinite recursion */
args = NULL;
t = tricat("stty", " ", s);
execstring(t, 1, 0);
zsfree(t);
args = exargs;
exargs = NULL;
}
arg0 = (char *) peekfirst(args);
cn = (Cmdnam) cmdnamtab->getnode(cmdnamtab, arg0);
/* If ARGV0 is in the commands environment, we use *
* that as argv[0] for this external command */
if ((z = zgetenv("ARGV0"))) {
setdata(firstnode(args), (void *) ztrdup(z));
delenv(z - 6);
} else if (dash) {
/* Else if the pre-command `-' was given, we add `-' *
* to the front of argv[0] for this command. */
sprintf(buf2, "-%s", arg0);
setdata(firstnode(args), (void *) ztrdup(buf2));
}
argv = makecline(args);
child_unblock();
if ((int) strlen(arg0) >= PATH_MAX) {
zerr("command too long: %s", arg0, 0);
_exit(1);
}
for (s = arg0; *s; s++)
if (*s == '/') {
errno = zexecve(arg0, argv);
if (arg0 == s || unset(PATHDIRS) ||
(arg0[0] == '.' && (arg0 + 1 == s ||
(arg0[1] == '.' && arg0 + 2 == s)))) {
zerr("%e: %s", arg0, errno);
_exit(1);
}
break;
}
if (cn) {
char nn[PATH_MAX], *dptr;
if (cn->flags & HASHED)
strcpy(nn, cn->u.cmd);
else {
for (pp = path; pp < cn->u.name; pp++)
if (!**pp || (**pp == '.' && (*pp)[1] == '\0')) {
ee = zexecve(arg0, argv);
if (isgooderr(ee, *pp))
eno = ee;
} else if (**pp != '/') {
z = buf;
strucpy(&z, *pp);
*z++ = '/';
strcpy(z, arg0);
ee = zexecve(buf, argv);
if (isgooderr(ee, *pp))
eno = ee;
}
strcpy(nn, cn->u.name ? *(cn->u.name) : "");
strcat(nn, "/");
strcat(nn, cn->nam);
}
ee = zexecve(nn, argv);
if ((dptr = strrchr(nn, '/')))
*dptr = '\0';
if (isgooderr(ee, *nn ? nn : "/"))
eno = ee;
}
for (pp = path; *pp; pp++)
if (!(*pp)[0] || ((*pp)[0] == '.' && !(*pp)[1])) {
ee = zexecve(arg0, argv);
if (isgooderr(ee, *pp))
eno = ee;
} else {
z = buf;
strucpy(&z, *pp);
*z++ = '/';
strcpy(z, arg0);
ee = zexecve(buf, argv);
if (isgooderr(ee, *pp))
eno = ee;
}
if (eno)
zerr("%e: %s", arg0, eno);
else
zerr("command not found: %s", arg0, 0);
_exit(1);
}
#define try(X) { if (iscom(X)) return ztrdup(X); }
/* get the full pathname of an external command */
/**/
char *
findcmd(char *arg0)
{
char **pp;
char *z, *s, buf[MAXCMDLEN];
Cmdnam cn;
cn = (Cmdnam) cmdnamtab->getnode(cmdnamtab, arg0);
if (!cn && isset(HASHCMDS))
cn = hashcmd(arg0, path);
if ((int) strlen(arg0) > PATH_MAX)
return NULL;
for (s = arg0; *s; s++)
if (*s == '/') {
try(arg0);
if (arg0 == s || unset(PATHDIRS)) {
return NULL;
}
break;
}
if (cn) {
char nn[PATH_MAX];
if (cn->flags & HASHED)
strcpy(nn, cn->u.cmd);
else {
for (pp = path; pp < cn->u.name; pp++)
if (**pp != '/') {
z = buf;
if (**pp) {
strucpy(&z, *pp);
*z++ = '/';
}
strcpy(z, arg0);
try(buf);
}
strcpy(nn, cn->u.name ? *(cn->u.name) : "");
strcat(nn, "/");
strcat(nn, cn->nam);
}
try(nn);
}
for (pp = path; *pp; pp++) {
z = buf;
if (**pp) {
strucpy(&z, *pp);
*z++ = '/';
}
strcpy(z, arg0);
try(buf);
}
return NULL;
}
/**/
int
iscom(char *s)
{
struct stat statbuf;
char *us = unmeta(s);
return (access(us, X_OK) == 0 && stat(us, &statbuf) >= 0 &&
S_ISREG(statbuf.st_mode));
}
/**/
int
isrelative(char *s)
{
if (*s != '/')
return 1;
for (; *s; s++)
if (*s == '.' && s[-1] == '/' &&
(s[1] == '/' || s[1] == '\0' ||
(s[1] == '.' && (s[2] == '/' || s[2] == '\0'))))
return 1;
return 0;
}
/**/
Cmdnam
hashcmd(char *arg0, char **pp)
{
Cmdnam cn;
char *s, buf[PATH_MAX];
char **pq;
for (; *pp; pp++)
if (**pp == '/') {
s = buf;
strucpy(&s, *pp);
*s++ = '/';
if ((s - buf) + strlen(arg0) >= PATH_MAX)
continue;
strcpy(s, arg0);
if (iscom(buf))
break;
}
if (!*pp)
return NULL;
cn = (Cmdnam) zcalloc(sizeof *cn);
cn->flags = 0;
cn->u.name = pp;
cmdnamtab->addnode(cmdnamtab, ztrdup(arg0), cn);
if (isset(HASHDIRS)) {
for (pq = pathchecked; pq <= pp; pq++)
hashdir(pq);
pathchecked = pp + 1;
}
return cn;
}
/* execute a string */
/**/
void
execstring(char *s, int dont_change_job, int exiting)
{
List list;
pushheap();
if ((list = parse_string(s)))
execlist(list, dont_change_job, exiting);
popheap();
}
/* Main routine for executing a list. *
* exiting means that the (sub)shell we are in is a definite goner *
* after the current list is finished, so we may be able to exec the *
* last command directly instead of forking. If dont_change_job is *
* nonzero, then restore the current job number after executing the *
* list. */
/**/
void
execlist(List list, int dont_change_job, int exiting)
{
Sublist slist;
static int donetrap;
int ret, cj;
int old_pline_level, old_list_pipe;
cj = thisjob;
old_pline_level = pline_level;
old_list_pipe = list_pipe;
if (sourcelevel && unset(SHINSTDIN))
pline_level = list_pipe = 0;
/* Loop over all sets of comands separated by newline, *
* semi-colon or ampersand (`sublists'). */
while (list && list != &dummy_list && !breaks && !retflag) {
/* Reset donetrap: this ensures that a trap is only *
* called once for each sublist that fails. */
donetrap = 0;
simplifyright(list);
slist = list->left;
/* Loop through code followed by &&, ||, or end of sublist. */
while (slist) {
switch (slist->type) {
case END:
/* End of sublist; just execute, ignoring status. */
execpline(slist, list->type, !list->right && exiting);
goto sublist_done;
break;
case ANDNEXT:
/* If the return code is non-zero, we skip pipelines until *
* we find a sublist followed by ORNEXT. */
if ((ret = execpline(slist, Z_SYNC, 0))) {
while ((slist = slist->right))
if (slist->type == ORNEXT)
break;
if (!slist) {
/* We've skipped to the end of the list, not executing *
* the final pipeline, so don't perform error handling *
* for this sublist. */
donetrap = 1;
goto sublist_done;
}
}
break;
case ORNEXT:
/* If the return code is zero, we skip pipelines until *
* we find a sublist followed by ANDNEXT. */
if (!(ret = execpline(slist, Z_SYNC, 0))) {
while ((slist = slist->right))
if (slist->type == ANDNEXT)
break;
if (!slist) {
/* We've skipped to the end of the list, not executing *
* the final pipeline, so don't perform error handling *
* for this sublist. */
donetrap = 1;
goto sublist_done;
}
}
break;
}
slist = slist->right;
}
sublist_done:
if (sigtrapped[SIGDEBUG])
dotrap(SIGDEBUG);
/* Check whether we are suppressing traps/errexit *
* (typically in init scripts) and if we haven't *
* already performed them for this sublist. */
if (!noerrexit && !donetrap) {
if (sigtrapped[SIGZERR] && lastval) {
dotrap(SIGZERR);
donetrap = 1;
}
if (lastval && isset(ERREXIT)) {
if (sigtrapped[SIGEXIT])
dotrap(SIGEXIT);
if (mypid != getpid())
_exit(lastval);
else
exit(lastval);
}
}
list = list->right;
}
pline_level = old_pline_level;
list_pipe = old_list_pipe;
if (dont_change_job)
thisjob = cj;
}
/* Execute a pipeline. *
* last1 is a flag that this command is the last command in a shell *
* that is about to exit, so we can exec instead of forking. It gets *
* passed all the way down to execcmd() which actually makes the *
* decision. A 0 is always passed if the command is not the last in *
* the pipeline. This function assumes that the sublist is not NULL. *
* If last1 is zero but the command is at the end of a pipeline, we *
* pass 2 down to execcmd(). *
*/
/**/
int
execpline(Sublist l, int how, int last1)
{
int ipipe[2], opipe[2];
int pj, newjob;
static int lastwj;
if (!l->left)
return lastval = (l->flags & PFLAG_NOT) != 0;
pj = thisjob;
ipipe[0] = ipipe[1] = opipe[0] = opipe[1] = 0;
child_block();
/* get free entry in job table and initialize it */
if ((thisjob = newjob = initjob()) == -1)
return 1;
if (how & Z_TIMED)
jobtab[thisjob].stat |= STAT_TIMED;
if (l->flags & PFLAG_COPROC) {
how = Z_ASYNC;
if (coprocin >= 0) {
zclose(coprocin);
zclose(coprocout);
}
mpipe(ipipe);
mpipe(opipe);
coprocin = ipipe[0];
coprocout = opipe[1];
fdtable[coprocin] = fdtable[coprocout] = 0;
}
if (!pline_level++) {
list_pipe_job = newjob;
nowait = 0;
}
list_pipe_pid = lastwj = 0;
if (pline_level == 1)
simple_pline = (l->left->type == END);
execpline2(l->left, how, opipe[0], ipipe[1], last1);
pline_level--;
if (how & Z_ASYNC) {
lastwj = newjob;
jobtab[thisjob].stat |= STAT_NOSTTY;
if (l->flags & PFLAG_COPROC)
zclose(ipipe[1]);
if (how & Z_DISOWN) {
deletejob(jobtab + thisjob);
thisjob = -1;
}
else
spawnjob();
child_unblock();
return 0;
} else {
if (newjob != lastwj) {
Job jn = jobtab + newjob;
if (newjob == list_pipe_job && list_pipe_child)
_exit(0);
lastwj = thisjob = newjob;
if (list_pipe)
jn->stat |= STAT_NOPRINT;
if (nowait) {
if(!pline_level) {
struct process *pn, *qn;
curjob = newjob;
addproc(list_pipe_pid, list_pipe_text);
for (pn = jobtab[jn->other].procs; pn; pn = pn->next)
if (WIFSTOPPED(pn->status))
break;
if (pn) {
for (qn = jn->procs; qn->next; qn = qn->next);
qn->status = pn->status;
}
jn->stat &= ~(STAT_DONE | STAT_NOPRINT);
jn->stat |= STAT_STOPPED | STAT_CHANGED;
printjob(jn, !!isset(LONGLISTJOBS), 1);
}
else
deletejob(jn);
}
for (; !nowait;) {
if (list_pipe_child) {
jn->stat |= STAT_NOPRINT;
makerunning(jn);
}
if (!(jn->stat & STAT_LOCKED))
waitjobs();
if (list_pipe_child &&
jn->stat & STAT_DONE &&
lastval2 & 0200)
killpg(mypgrp, lastval2 & ~0200);
if ((list_pipe || last1) && !list_pipe_child &&
jn->stat & STAT_STOPPED) {
pid_t pid;
int synch[2];
pipe(synch);
if ((pid = fork()) == -1) {
close(synch[0]);
close(synch[1]);
putc('\n', stderr);
fprintf(stderr, "zsh: job can't be suspended\n");
fflush(stderr);
makerunning(jn);
killjb(jn, SIGCONT);
thisjob = newjob;
}
else if (pid) {
char dummy;
ForkCounter++;
list_pipe_pid = pid;
nowait = errflag = 1;
breaks = loops;
close(synch[1]);
read(synch[0], &dummy, 1);
close(synch[0]);
jobtab[list_pipe_job].other = newjob;
jobtab[list_pipe_job].stat |= STAT_SUPERJOB;
jn->stat |= STAT_SUBJOB | STAT_NOPRINT;
jn->other = pid;
killpg(jobtab[list_pipe_job].gleader, SIGSTOP);
break;
}
else {
close(synch[0]);
entersubsh(Z_ASYNC, 0, 0);
setpgrp(0L, mypgrp = jobtab[list_pipe_job].gleader);
close(synch[1]);
kill(getpid(), SIGSTOP);
list_pipe = 0;
list_pipe_child = 1;
break;
}
}
else if (subsh && jn->stat & STAT_STOPPED)
thisjob = newjob;
else
break;
}
child_unblock();
if (list_pipe && (lastval & 0200) && pj >= 0 &&
(!(jn->stat & STAT_INUSE) || (jn->stat & STAT_DONE))) {
jn = jobtab + pj;
jn->stat |= STAT_NOPRINT;
killjb(jobtab + pj, lastval & ~0200);
}
if (list_pipe_child || (list_pipe && (jn->stat & STAT_DONE)))
deletejob(jn);
thisjob = pj;
}
if (l->flags & PFLAG_NOT)
lastval = !lastval;
}
if (!pline_level)
simple_pline = 0;
return lastval;
}
int subsh_close = -1;
/* execute pipeline. This function assumes the `pline' is not NULL. */
/**/
void
execpline2(Pline pline, int how, int input, int output, int last1)
{
pid_t pid;
int pipes[2];
int oldlineno;
if (breaks || retflag)
return;
oldlineno = lineno;
lineno = pline->left->lineno;
if (pline_level == 1)
strcpy(list_pipe_text, getjobtext((void *) pline->left));
if (pline->type == END) {
execcmd(pline->left, input, output, how, last1 ? 1 : 2);
pline->left = NULL;
} else {
int old_list_pipe = list_pipe;
mpipe(pipes);
/* if we are doing "foo | bar" where foo is a current *
* shell command, do foo in a subshell and do the *
* rest of the pipeline in the current shell. */
if (pline->left->type >= CURSH && (how & Z_SYNC)) {
int synch[2];
pipe(synch);
if ((pid = fork()) == -1) {
close(synch[0]);
close(synch[1]);
zerr("fork failed: %e", NULL, errno);
} else if (pid) {
char dummy, *text;
ForkCounter++;
text = getjobtext((void *) pline->left);
addproc(pid, text);
close(synch[1]);
read(synch[0], &dummy, 1);
close(synch[0]);
} else {
zclose(pipes[0]);
close(synch[0]);
entersubsh(how, 2, 0);
close(synch[1]);
execcmd(pline->left, input, pipes[1], how, 0);
_exit(lastval);
}
} else {
/* otherwise just do the pipeline normally. */
subsh_close = pipes[0];
execcmd(pline->left, input, pipes[1], how, 0);
}
pline->left = NULL;
zclose(pipes[1]);
if (pline->right) {
/* if another execpline() is invoked because the command is *
* a list it must know that we're already in a pipeline */
list_pipe = 1;
execpline2(pline->right, how, pipes[0], output, last1);
list_pipe = old_list_pipe;
zclose(pipes[0]);
subsh_close = -1;
}
}
lineno = oldlineno;
}
/* make the argv array */
/**/
char **
makecline(LinkList list)
{
LinkNode node;
char **argv, **ptr;
/* A bigger argv is necessary for executing scripts */
ptr =
argv = 2 + (char **) ncalloc((countlinknodes(list) + 4) * sizeof(char *));
if ((isset(XTRACE)) && isset(TRACE)) {
if (!doneps4)
#ifdef ORIGPROMPT
fprintf(stderr, "%s", (prompt4) ? prompt4 : "");
#else
if (prompt4)
{
struct tm *tm;
char bp[80];
time_t timet = time(NULL);
tm = localtime(&timet);
ztrftime(bp, 79, prompt4, tm);
fprintf(stderr, "%s%ld, %ld, %ld, %s+ ", bp, lineno, (long)lastval, ForkCounter, isset(SHINSTDIN) ? "zsh" : scriptname ? scriptname : argzero);
}
#endif
for (node = firstnode(list); node; incnode(node)) {
*ptr++ = (char *)getdata(node);
zputs(getdata(node), stderr);
if (nextnode(node))
fputc(' ', stderr);
}
fputc('\n', stderr);
fflush(stderr);
} else {
for (node = firstnode(list); node; incnode(node))
*ptr++ = (char *)getdata(node);
}
*ptr = NULL;
return (argv);
}
/**/
void
untokenize(char *s)
{
for (; *s; s++)
if (itok(*s))
if (*s == Nularg)
chuck(s--);
else
*s = ztokens[*s - Pound];
}
/* Open a file for writing redicection */
/**/
int
clobber_open(struct redir *f)
{
struct stat buf;
int fd;
int O_Creat=0;
if (isset(CREATE))
O_Creat=O_CREAT;
if (isset(CLOBBER) || IS_CLOBBER_REDIR(f->type))
return open(unmeta(f->name), O_WRONLY | O_Creat | O_TRUNC, 0666);
if (stat(unmeta(f->name), &buf) || S_ISREG(buf.st_mode))
return open(unmeta(f->name), O_WRONLY | O_Creat | O_EXCL, 0666);
if ((fd = open(unmeta(f->name), O_WRONLY)) < 0)
return fd;
if (!fstat(fd, &buf) && !S_ISREG(buf.st_mode))
return fd;
/* someone replaced the file between stat and open */
close(fd);
errno = EEXIST;
return -1;
}
/* size of buffer for tee and cat processes */
#define TCBUFSIZE 4092
/* close an multio (success) */
/**/
void
closemn(struct multio **mfds, int fd)
{
struct multio *mn = mfds[fd];
char buf[TCBUFSIZE];
int len, i;
if (fd < 0 || !mfds[fd] || mfds[fd]->ct < 2)
return;
if (zfork()) {
ForkCounter++;
for (i = 0; i < mn->ct; i++)
zclose(mn->fds[i]);
zclose(mn->pipe);
mn->ct = 1;
mn->fds[0] = fd;
return;
}
/* pid == 0 */
closeallelse(mn);
if (mn->rflag) {
/* tee process */
while ((len = read(mn->pipe, buf, TCBUFSIZE)) > 0)
for (i = 0; i < mn->ct; i++)
write(mn->fds[i], buf, len);
} else {
/* cat process */
for (i = 0; i < mn->ct; i++)
while ((len = read(mn->fds[i], buf, TCBUFSIZE)) > 0)
write(mn->pipe, buf, len);
}
_exit(0);
}
/* close all the mnodes (failure) */
/**/
void
closemnodes(struct multio **mfds)
{
int i, j;
for (i = 0; i < 10; i++)
if (mfds[i]) {
for (j = 0; j < mfds[i]->ct; j++)
zclose(mfds[i]->fds[j]);