--- libelwix/src/pio.c 2013/12/05 15:04:20 1.1.2.2 +++ libelwix/src/pio.c 2024/10/28 09:58:51 1.10 @@ -1,31 +1,120 @@ +/************************************************************************* +* (C) 2013 AITNET ltd - Sofia/Bulgaria - +* by Michael Pounov +* +* $Author: misho $ +* $Id: pio.c,v 1.10 2024/10/28 09:58:51 misho Exp $ +* +************************************************************************** +The ELWIX and AITNET software is distributed under the following +terms: + +All of the documentation and software included in the ELWIX and AITNET +Releases is copyrighted by ELWIX - Sofia/Bulgaria + +Copyright 2004 - 2024 + by Michael Pounov . All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions +are met: +1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. +2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. +3. All advertising materials mentioning features or use of this software + must display the following acknowledgement: +This product includes software developed by Michael Pounov +ELWIX - Embedded LightWeight unIX and its contributors. +4. Neither the name of AITNET nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +SUCH DAMAGE. +*/ #include "global.h" +#ifdef __linux__ +#define __USE_GNU + +#ifndef O_CLOEXEC +#define O_CLOEXEC 02000000 +#endif +#endif + extern char **environ; pio_pid_t pio_pidlist = SLIST_HEAD_INITIALIZER(pio_pidlist); +#ifdef HAVE_LIBPTHREAD static pthread_mutex_t pidlist_mutex = PTHREAD_MUTEX_INITIALIZER; -#define THREAD_LOCK() if (__isthreaded) pthread_mutex_lock(&pidlist_mutex) -#define THREAD_UNLOCK() if (__isthreaded) pthread_mutex_unlock(&pidlist_mutex) +#define THREAD_LOCK() pthread_mutex_lock(&pidlist_mutex) +#define THREAD_UNLOCK() pthread_mutex_unlock(&pidlist_mutex) +#else +#define THREAD_LOCK() +#define THREAD_UNLOCK() +#endif - /* * e_popen() - ELWIX replacement of standard popen * * @command = command * @type = type * @ppid = return pid of child program + * If value of *ppid is -1 when invoke routine then child will be session leader * return: NULL error or !=NULL open program */ +#ifdef POPEN_STREAM FILE * +#else +int +#endif e_popen(const char *command, const char *type, pid_t *ppid) { + return e_popen2(command, type, ppid, NULL, 0); +} + +/* + * e_popen2() - ELWIX replacement of standard popen with post close of chosen handles + * + * @command = command + * @type = type + * @ppid = return pid of child program + * If value of *ppid is -1 when invoke routine then child will be session leader + * @fds = file descriptor array for close when fork + * @fdslen = fds number of descriptors + * return: NULL error or !=NULL open program + */ +#ifdef POPEN_STREAM +FILE * +#else +int +#endif +e_popen2(const char *command, const char *type, pid_t *ppid, int *fds, size_t fdslen) +{ struct tagPIOPID *cur, *p; - FILE *iop; - int pdes[2], pid, twoway, cloexec; + int pdes[2], pid, twoway, cloexec, i; char *argv[4]; + if (!command || !type) +#ifdef POPEN_STREAM + return NULL; +#else + return -1; +#endif + cloexec = strchr(type, 'e') != NULL; /* * Lite2 introduced two-way popen() pipes using _socketpair(). @@ -34,36 +123,64 @@ e_popen(const char *command, const char *type, pid_t * if (strchr(type, '+')) { twoway = 1; type = "r+"; - } else { + } else { twoway = 0; - if ((*type != 'r' && *type != 'w') || - (type[1] && (type[1] != 'e' || type[2]))) - return (NULL); + if ((*type != 'r' && *type != 'w') || + (type[1] && (type[1] != 'e' || type[2]))) +#ifdef POPEN_STREAM + return NULL; +#else + return -1; +#endif } - if ((cloexec ? pipe2(pdes, O_CLOEXEC) : pipe(pdes)) < 0) - return (NULL); + if (socketpair(AF_UNIX, SOCK_STREAM | (cloexec ? O_CLOEXEC : 0), + 0, pdes) < 0) { + LOGERR; +#ifdef POPEN_STREAM + return NULL; +#else + return -1; +#endif + } if (!(cur = e_malloc(sizeof(struct tagPIOPID)))) { close(pdes[0]); close(pdes[1]); - return (NULL); +#ifdef POPEN_STREAM + return NULL; +#else + return -1; +#endif } argv[0] = "sh"; argv[1] = "-c"; - argv[2] = (char *)command; + argv[2] = (char *) command; argv[3] = NULL; THREAD_LOCK(); - switch (pid = vfork()) { + switch (pid = fork()) { case -1: /* Error. */ + LOGERR; THREAD_UNLOCK(); close(pdes[0]); close(pdes[1]); e_free(cur); - return (NULL); +#ifdef POPEN_STREAM + return NULL; +#else + return -1; +#endif /* NOTREACHED */ case 0: /* Child. */ + if (ppid && *ppid == -1) + setsid(); + + if (fds && fdslen) { + for (i = 0; i < fdslen; i++) + close(fds[i]); + } + if (*type == 'r') { /* * The _dup2() to STDIN_FILENO is repeated to avoid @@ -98,7 +215,11 @@ e_popen(const char *command, const char *type, pid_t * close(pdes[1]); } SLIST_FOREACH(p, &pio_pidlist, next) - close(fileno(p->fp)); +#ifdef POPEN_STREAM + close(fileno(p->f.fp)); +#else + close(p->f.fd); +#endif execve(_PATH_BSHELL, argv, environ); _exit(127); /* NOTREACHED */ @@ -110,21 +231,32 @@ e_popen(const char *command, const char *type, pid_t * /* Parent; assume fdopen can't fail. */ if (*type == 'r') { - iop = fdopen(pdes[0], type); +#ifdef POPEN_STREAM + cur->f.fp = fdopen(pdes[0], type); +#else + cur->f.fd = pdes[0]; +#endif close(pdes[1]); } else { - iop = fdopen(pdes[1], type); +#ifdef POPEN_STREAM + cur->f.fp = fdopen(pdes[1], type); +#else + cur->f.fd = pdes[1]; +#endif close(pdes[0]); } /* Link into list of file descriptors. */ - cur->fp = iop; cur->pid = pid; THREAD_LOCK(); SLIST_INSERT_HEAD(&pio_pidlist, cur, next); THREAD_UNLOCK(); - return (iop); +#ifdef POPEN_STREAM + return cur->f.fp; +#else + return cur->f.fd; +#endif } /* @@ -134,18 +266,29 @@ e_popen(const char *command, const char *type, pid_t * * return: -1 error or !=-1 pid status */ int +#ifdef POPEN_STREAM e_pclose(FILE *iop) +#else +e_pclose(int iop) +#endif { struct tagPIOPID *cur, *last = NULL; - int pstat; + int pstat = 0; pid_t pid; + if (!iop) + return -1; + /* * Find the appropriate file pointer and remove it from the list. */ THREAD_LOCK(); SLIST_FOREACH(cur, &pio_pidlist, next) { - if (cur->fp == iop) +#ifdef POPEN_STREAM + if (cur->f.fp == iop) +#else + if (cur->f.fd == iop) +#endif break; last = cur; } @@ -159,7 +302,11 @@ e_pclose(FILE *iop) SLIST_REMOVE_AFTER(last, next); THREAD_UNLOCK(); +#ifdef POPEN_STREAM fclose(iop); +#else + close(iop); +#endif do { pid = wait4(cur->pid, &pstat, 0, NULL); @@ -168,4 +315,72 @@ e_pclose(FILE *iop) e_free(cur); return (pid == -1 ? -1 : pstat); +} + +/* + * pio_pgetpid() - Get tagPIOPID structure from file handle + * + * @iop = popen handle + * return: NULL error or !=NULL tagPIOPID structure + */ +struct tagPIOPID * +#ifdef POPEN_STREAM +pio_pgetpid(FILE *iop) +#else +pio_pgetpid(int iop) +#endif +{ + struct tagPIOPID *p; + + if (!iop) + return NULL; + + THREAD_LOCK(); + SLIST_FOREACH(p, &pio_pidlist, next) +#ifdef POPEN_STREAM + if (p->f.fp == iop) +#else + if (p->f.fd == iop) +#endif + break; + THREAD_UNLOCK(); + + return p; +} + +/* + * pio_pchkpid() - Check exit status of child programs + * + * @pids = return tagPIOPID structures of exited programs, + * if !=NULL must call array_Destroy() + * return: -1 error or >-1 exited programs + */ +int +pio_pchkpid(array_t ** __restrict pids) +{ + register int ret = 0; + struct tagPIOPID *p; + array_t *pa = NULL; + + if (pids) { + if (!(pa = array_Init(0))) + return -1; + else + *pids = pa; + } + + THREAD_LOCK(); + SLIST_FOREACH(p, &pio_pidlist, next) +#ifdef POPEN_STREAM + if (p->f.fp && waitpid(p->pid, &p->stat, WNOHANG) > 0) { +#else + if (p->f.fd && waitpid(p->pid, &p->stat, WNOHANG) > 0) { +#endif + if (pids) + array_Push(pa, p, 0); + ret++; + } + THREAD_UNLOCK(); + + return ret; }