diff options
Diffstat (limited to 'sysdeps/posix/pipestream.c')
| -rw-r--r-- | sysdeps/posix/pipestream.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/sysdeps/posix/pipestream.c b/sysdeps/posix/pipestream.c deleted file mode 100644 index 94e09f1b9d..0000000000 --- a/sysdeps/posix/pipestream.c +++ /dev/null @@ -1,221 +0,0 @@ -/* Copyright (C) 1991, 1992, 1993, 1996, 1997 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <errno.h> -#include <stddef.h> -#include <signal.h> -#include <stdio.h> -#include <stdlib.h> -#include <sys/types.h> -#include <sys/wait.h> -#include <unistd.h> -#include <fcntl.h> - -#define SH_PATH "/bin/sh" /* Shell to run. */ -#define SH_NAME "sh" /* Name to give it. */ - -/* Structure describing a popen child. */ -struct child - { - pid_t pid; /* PID of the child. */ - __ptr_t cookie; /* Original cookie from fdopen. */ - __io_functions funcs; /* Original functions from fdopen. */ - }; - -/* io_functions for pipe streams. - These all simply call the corresponding - original function with the original cookie. */ - -#define FUNC(type, name, proto, args) \ - static type __CONCAT(child_,name) proto \ - { \ - struct child *c = (struct child *) cookie; \ - { \ - __ptr_t cookie = c->cookie; \ - return (*c->funcs.__CONCAT(__,name)) args; \ - } \ - } - -FUNC (int, read, (void *cookie, char *buf, size_t n), (cookie, buf, n)) -FUNC (int, write, (void *cookie, const char *buf, size_t n), (cookie, buf, n)) -FUNC (int, seek, (void *cookie, fpos_t *pos, int whence), - (cookie, pos, whence)) -FUNC (int, close, (void *cookie), (cookie)) -FUNC (int, fileno, (void *cookie), (cookie)) - -static const __io_functions child_funcs - = { child_read, child_write, child_seek, child_close, child_fileno }; - -/* Open a new stream that is a one-way pipe to a - child process running the given shell command. */ -FILE * -popen (command, mode) - const char *command; - const char *mode; -{ - pid_t pid; - int pipedes[2]; - FILE *stream; - struct child *child; - - if (command == NULL || mode == NULL || (*mode != 'r' && *mode != 'w')) - { - __set_errno (EINVAL); - return NULL; - } - - /* Create the pipe. */ - if (pipe (pipedes) < 0) - return NULL; - - /* Fork off the child. */ - pid = __vfork (); - if (pid == (pid_t) -1) - { - /* The fork failed. */ - (void) close (pipedes[0]); - (void) close (pipedes[1]); - return NULL; - } - else if (pid == (pid_t) 0) - { - /* We are the child side. Make the write side of - the pipe be stdin or the read side be stdout. */ - - const char *new_argv[4]; - - if ((*mode == 'w' ? dup2(pipedes[STDIN_FILENO], STDIN_FILENO) : - dup2 (pipedes[STDOUT_FILENO], STDOUT_FILENO)) < 0) - _exit (127); - - /* Close the pipe descriptors. */ - (void) close (pipedes[STDIN_FILENO]); - (void) close (pipedes[STDOUT_FILENO]); - - /* Exec the shell. */ - new_argv[0] = SH_NAME; - new_argv[1] = "-c"; - new_argv[2] = command; - new_argv[3] = NULL; - (void) execve (SH_PATH, (char *const *) new_argv, environ); - /* Die if it failed. */ - _exit (127); - } - - /* We are the parent side. */ - - /* Close the irrelevant side of the pipe and open the relevant side as a - new stream. Mark our side of the pipe to close on exec, so new children - won't see it. */ - if (*mode == 'r') - { - (void) close (pipedes[STDOUT_FILENO]); - (void) fcntl (pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC); - stream = fdopen (pipedes[STDIN_FILENO], mode); - } - else - { - (void) close (pipedes[STDIN_FILENO]); - (void) fcntl (pipedes[STDOUT_FILENO], F_SETFD, FD_CLOEXEC); - stream = fdopen (pipedes[STDOUT_FILENO], mode); - } - - if (stream == NULL) - goto error; - - child = (struct child *) malloc (sizeof (struct child)); - if (child == NULL) - goto error; - - { - /* Make sure STREAM has its functions set before - we try to squirrel them away in CHILD. */ - extern void __stdio_check_funcs __P ((FILE *)); - __stdio_check_funcs (stream); - } - - child->pid = pid; - child->cookie = stream->__cookie; - child->funcs = stream->__io_funcs; - stream->__cookie = (void *) child; - stream->__io_funcs = child_funcs; - stream->__ispipe = 1; - return stream; - - error: - { - /* The stream couldn't be opened or the child structure couldn't be - allocated. Kill the child and close the other side of the pipe. */ - int save = errno; - (void) kill (pid, SIGKILL); - if (stream == NULL) - (void) close (pipedes[*mode == 'r' ? STDOUT_FILENO : STDIN_FILENO]); - else - (void) fclose (stream); -#ifndef NO_WAITPID - (void) waitpid (pid, (int *) NULL, 0); -#else - { - pid_t dead; - do - dead = wait ((int *) NULL); - while (dead > 0 && dead != pid); - } -#endif - __set_errno (save); - return NULL; - } -} - -/* Close a stream opened by popen and return its status. - Returns -1 if the stream was not opened by popen. */ -int -pclose (stream) - register FILE *stream; -{ - struct child *c; - pid_t pid, dead; - int status; - - if (!__validfp (stream) || !stream->__ispipe) - { - __set_errno (EINVAL); - return -1; - } - - c = (struct child *) stream->__cookie; - pid = c->pid; - stream->__cookie = c->cookie; - stream->__io_funcs = c->funcs; - free ((void *) c); - stream->__ispipe = 0; - if (fclose (stream)) - return -1; - -#ifndef NO_WAITPID - dead = waitpid (pid, &status, 0); -#else - do - dead = wait (&status); - while (dead > 0 && dead != pid); -#endif - if (dead != pid) - status = -1; - - return status; -} |