diff options
Diffstat (limited to 'libc/unistd/popen.c')
| -rw-r--r-- | libc/unistd/popen.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/libc/unistd/popen.c b/libc/unistd/popen.c deleted file mode 100644 index 15f8325..0000000 --- a/libc/unistd/popen.c +++ /dev/null @@ -1,167 +0,0 @@ -/* $OpenBSD: popen.c,v 1.17 2005/08/08 08:05:34 espie Exp $ */ -/* - * Copyright (c) 1988, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software written by Ken Arnold and - * published in UNIX Review, Vol. 6, No. 8. - * - * 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. Neither the name of the University 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 THE REGENTS 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 <sys/param.h> -#include <sys/wait.h> - -#include <signal.h> -#include <errno.h> -#include <unistd.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <paths.h> - -static struct pid { - struct pid *next; - FILE *fp; - pid_t pid; -} *pidlist; - -FILE * -popen(const char *program, const char *type) -{ - struct pid * volatile cur; - FILE *iop; - int pdes[2]; - pid_t pid; - - if ((*type != 'r' && *type != 'w') || type[1] != '\0') { - errno = EINVAL; - return (NULL); - } - - if ((cur = malloc(sizeof(struct pid))) == NULL) - return (NULL); - - if (pipe(pdes) < 0) { - free(cur); - return (NULL); - } - - switch (pid = vfork()) { - case -1: /* Error. */ - (void)close(pdes[0]); - (void)close(pdes[1]); - free(cur); - return (NULL); - /* NOTREACHED */ - case 0: /* Child. */ - { - struct pid *pcur; - /* - * because vfork() instead of fork(), must leak FILE *, - * but luckily we are terminally headed for an execl() - */ - for (pcur = pidlist; pcur; pcur = pcur->next) - close(fileno(pcur->fp)); - - if (*type == 'r') { - int tpdes1 = pdes[1]; - - (void) close(pdes[0]); - /* - * We must NOT modify pdes, due to the - * semantics of vfork. - */ - if (tpdes1 != STDOUT_FILENO) { - (void)dup2(tpdes1, STDOUT_FILENO); - (void)close(tpdes1); - tpdes1 = STDOUT_FILENO; - } - } else { - (void)close(pdes[1]); - if (pdes[0] != STDIN_FILENO) { - (void)dup2(pdes[0], STDIN_FILENO); - (void)close(pdes[0]); - } - } - execl(_PATH_BSHELL, "sh", "-c", program, (char *)NULL); - _exit(127); - /* NOTREACHED */ - } - } - - /* Parent; assume fdopen can't fail. */ - if (*type == 'r') { - iop = fdopen(pdes[0], type); - (void)close(pdes[1]); - } else { - iop = fdopen(pdes[1], type); - (void)close(pdes[0]); - } - - /* Link into list of file descriptors. */ - cur->fp = iop; - cur->pid = pid; - cur->next = pidlist; - pidlist = cur; - - return (iop); -} - -/* - * pclose -- - * Pclose returns -1 if stream is not associated with a `popened' command, - * if already `pclosed', or waitpid returns an error. - */ -int -pclose(FILE *iop) -{ - struct pid *cur, *last; - int pstat; - pid_t pid; - - /* Find the appropriate file pointer. */ - for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next) - if (cur->fp == iop) - break; - - if (cur == NULL) - return (-1); - - (void)fclose(iop); - - do { - pid = waitpid(cur->pid, &pstat, 0); - } while (pid == -1 && errno == EINTR); - - /* Remove the entry from the linked list. */ - if (last == NULL) - pidlist = cur->next; - else - last->next = cur->next; - free(cur); - - return (pid == -1 ? -1 : pstat); -} |