diff options
Diffstat (limited to 'lib/libc/gen/popen.c')
| -rw-r--r-- | lib/libc/gen/popen.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/lib/libc/gen/popen.c b/lib/libc/gen/popen.c deleted file mode 100644 index 8cb7950..0000000 --- a/lib/libc/gen/popen.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * 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. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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. - */ - -#if defined(LIBC_SCCS) && !defined(lint) -static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 5/3/95"; -#endif /* LIBC_SCCS and not lint */ - -#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(command, type) - const char *command, *type; -{ - struct pid *cur; - FILE *iop; - int pdes[2], pid, twoway; - - /* - * Lite2 introduced two-way popen() pipes using socketpair(). - * FreeBSD's pipe() is bidirectional, so we use that. - */ - if (strchr(type, '+')) { - twoway = 1; - type = "r+"; - } else { - twoway = 0; - if ((*type != 'r' && *type != 'w') || type[1]) - return (NULL); - } - if (pipe(pdes) < 0) - return (NULL); - - if ((cur = malloc(sizeof(struct pid))) == NULL) { - (void)close(pdes[0]); - (void)close(pdes[1]); - return (NULL); - } - - switch (pid = vfork()) { - case -1: /* Error. */ - (void)close(pdes[0]); - (void)close(pdes[1]); - free(cur); - return (NULL); - /* NOTREACHED */ - case 0: /* Child. */ - if (*type == 'r') { - /* - * The dup2() to STDIN_FILENO is repeated to avoid - * writing to pdes[1], which might corrupt the - * parent's copy. This isn't good enough in - * general, since the _exit() is no return, so - * the compiler is free to corrupt all the local - * variables. - */ - (void) close(pdes[0]); - if (pdes[1] != STDOUT_FILENO) { - (void)dup2(pdes[1], STDOUT_FILENO); - (void)close(pdes[1]); - if (twoway) - (void)dup2(STDOUT_FILENO, STDIN_FILENO); - } else if (twoway && (pdes[1] != STDIN_FILENO)) - (void)dup2(pdes[1], STDIN_FILENO); - } else { - if (pdes[0] != STDIN_FILENO) { - (void)dup2(pdes[0], STDIN_FILENO); - (void)close(pdes[0]); - } - (void)close(pdes[1]); - } - execl(_PATH_BSHELL, "sh", "-c", command, 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(iop) - FILE *iop; -{ - register struct pid *cur, *last; - int omask; - 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); -} |
