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glibc/libio/oldiopopen.c
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/* Copyright (C) 1998-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Written by Per Bothner <bothner@cygnus.com>. | |
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, see | |
<http://www.gnu.org/licenses/>. | |
As a special exception, if you link the code in this file with | |
files compiled with a GNU compiler to produce an executable, | |
that does not cause the resulting executable to be covered by | |
the GNU Lesser General Public License. This exception does not | |
however invalidate any other reasons why the executable file | |
might be covered by the GNU Lesser General Public License. | |
This exception applies to code released by its copyright holders | |
in files containing the exception. */ | |
#define _IO_USE_OLD_IO_FILE | |
#ifndef _POSIX_SOURCE | |
# define _POSIX_SOURCE | |
#endif | |
#include "libioP.h" | |
#include <signal.h> | |
#include <unistd.h> | |
#include <stdlib.h> | |
#ifdef _LIBC | |
# include <unistd.h> | |
#endif | |
#include <sys/types.h> | |
#include <sys/wait.h> | |
#ifndef _IO_fork | |
#ifdef _LIBC | |
#define _IO_fork __fork | |
#else | |
#define _IO_fork fork /* defined in libiberty, if needed */ | |
#endif | |
extern _IO_pid_t _IO_fork (void) __THROW; | |
#endif | |
#include <shlib-compat.h> | |
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
#ifndef _IO_pipe | |
#ifdef _LIBC | |
#define _IO_pipe __pipe | |
#else | |
#define _IO_pipe pipe | |
#endif | |
extern int _IO_pipe (int des[2]) __THROW; | |
#endif | |
#ifndef _IO_dup2 | |
#ifdef _LIBC | |
#define _IO_dup2 __dup2 | |
#else | |
#define _IO_dup2 dup2 | |
#endif | |
extern int _IO_dup2 (int fd, int fd2) __THROW; | |
#endif | |
#ifndef _IO_waitpid | |
#ifdef _LIBC | |
#define _IO_waitpid __waitpid | |
#else | |
#define _IO_waitpid waitpid | |
#endif | |
#endif | |
#ifndef _IO_execl | |
#define _IO_execl execl | |
#endif | |
#ifndef _IO__exit | |
#define _IO__exit _exit | |
#endif | |
#ifndef _IO_close | |
#ifdef _LIBC | |
#define _IO_close __close | |
#else | |
#define _IO_close close | |
#endif | |
#endif | |
struct _IO_proc_file | |
{ | |
struct _IO_FILE_complete_plus file; | |
/* Following fields must match those in class procbuf (procbuf.h) */ | |
_IO_pid_t pid; | |
struct _IO_proc_file *next; | |
}; | |
typedef struct _IO_proc_file _IO_proc_file; | |
static struct _IO_proc_file *old_proc_file_chain; | |
#ifdef _IO_MTSAFE_IO | |
static _IO_lock_t proc_file_chain_lock = _IO_lock_initializer; | |
static void | |
unlock (void *not_used) | |
{ | |
_IO_lock_unlock (proc_file_chain_lock); | |
} | |
#endif | |
_IO_FILE * | |
attribute_compat_text_section | |
_IO_old_proc_open (_IO_FILE *fp, const char *command, const char *mode) | |
{ | |
volatile int read_or_write; | |
volatile int parent_end, child_end; | |
int pipe_fds[2]; | |
_IO_pid_t child_pid; | |
if (_IO_file_is_open (fp)) | |
return NULL; | |
if (_IO_pipe (pipe_fds) < 0) | |
return NULL; | |
if (mode[0] == 'r' && mode[1] == '\0') | |
{ | |
parent_end = pipe_fds[0]; | |
child_end = pipe_fds[1]; | |
read_or_write = _IO_NO_WRITES; | |
} | |
else if (mode[0] == 'w' && mode[1] == '\0') | |
{ | |
parent_end = pipe_fds[1]; | |
child_end = pipe_fds[0]; | |
read_or_write = _IO_NO_READS; | |
} | |
else | |
{ | |
_IO_close (pipe_fds[0]); | |
_IO_close (pipe_fds[1]); | |
__set_errno (EINVAL); | |
return NULL; | |
} | |
((_IO_proc_file *) fp)->pid = child_pid = _IO_fork (); | |
if (child_pid == 0) | |
{ | |
int child_std_end = mode[0] == 'r' ? 1 : 0; | |
struct _IO_proc_file *p; | |
_IO_close (parent_end); | |
if (child_end != child_std_end) | |
{ | |
_IO_dup2 (child_end, child_std_end); | |
_IO_close (child_end); | |
} | |
/* POSIX.2: "popen() shall ensure that any streams from previous | |
popen() calls that remain open in the parent process are closed | |
in the new child process." */ | |
for (p = old_proc_file_chain; p; p = p->next) | |
_IO_close (_IO_fileno ((_IO_FILE *) p)); | |
_IO_execl ("/bin/sh", "sh", "-c", command, (char *) 0); | |
_IO__exit (127); | |
} | |
_IO_close (child_end); | |
if (child_pid < 0) | |
{ | |
_IO_close (parent_end); | |
return NULL; | |
} | |
_IO_fileno (fp) = parent_end; | |
/* Link into old_proc_file_chain. */ | |
#ifdef _IO_MTSAFE_IO | |
_IO_cleanup_region_start_noarg (unlock); | |
_IO_lock_lock (proc_file_chain_lock); | |
#endif | |
((_IO_proc_file *) fp)->next = old_proc_file_chain; | |
old_proc_file_chain = (_IO_proc_file *) fp; | |
#ifdef _IO_MTSAFE_IO | |
_IO_lock_unlock (proc_file_chain_lock); | |
_IO_cleanup_region_end (0); | |
#endif | |
_IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES); | |
return fp; | |
} | |
_IO_FILE * | |
attribute_compat_text_section | |
_IO_old_popen (const char *command, const char *mode) | |
{ | |
struct locked_FILE | |
{ | |
struct _IO_proc_file fpx; | |
#ifdef _IO_MTSAFE_IO | |
_IO_lock_t lock; | |
#endif | |
} *new_f; | |
_IO_FILE *fp; | |
new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); | |
if (new_f == NULL) | |
return NULL; | |
#ifdef _IO_MTSAFE_IO | |
new_f->fpx.file.file._file._lock = &new_f->lock; | |
#endif | |
fp = &new_f->fpx.file.file._file; | |
_IO_old_init (fp, 0); | |
_IO_JUMPS_FILE_plus (&new_f->fpx.file) = &_IO_old_proc_jumps; | |
_IO_old_file_init ((struct _IO_FILE_plus *) &new_f->fpx.file); | |
#if !_IO_UNIFIED_JUMPTABLES | |
new_f->fpx.file.vtable = NULL; | |
#endif | |
if (_IO_old_proc_open (fp, command, mode) != NULL) | |
return fp; | |
_IO_un_link ((struct _IO_FILE_plus *) &new_f->fpx.file); | |
free (new_f); | |
return NULL; | |
} | |
int | |
attribute_compat_text_section | |
_IO_old_proc_close (_IO_FILE *fp) | |
{ | |
/* This is not name-space clean. FIXME! */ | |
int wstatus; | |
_IO_proc_file **ptr = &old_proc_file_chain; | |
_IO_pid_t wait_pid; | |
int status = -1; | |
/* Unlink from old_proc_file_chain. */ | |
#ifdef _IO_MTSAFE_IO | |
_IO_cleanup_region_start_noarg (unlock); | |
_IO_lock_lock (proc_file_chain_lock); | |
#endif | |
for ( ; *ptr != NULL; ptr = &(*ptr)->next) | |
{ | |
if (*ptr == (_IO_proc_file *) fp) | |
{ | |
*ptr = (*ptr)->next; | |
status = 0; | |
break; | |
} | |
} | |
#ifdef _IO_MTSAFE_IO | |
_IO_lock_unlock (proc_file_chain_lock); | |
_IO_cleanup_region_end (0); | |
#endif | |
if (status < 0 || _IO_close (_IO_fileno(fp)) < 0) | |
return -1; | |
/* POSIX.2 Rationale: "Some historical implementations either block | |
or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting | |
for the child process to terminate. Since this behavior is not | |
described in POSIX.2, such implementations are not conforming." */ | |
do | |
{ | |
wait_pid = _IO_waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0); | |
} | |
while (wait_pid == -1 && errno == EINTR); | |
if (wait_pid == -1) | |
return -1; | |
return wstatus; | |
} | |
const struct _IO_jump_t _IO_old_proc_jumps = { | |
JUMP_INIT_DUMMY, | |
JUMP_INIT(finish, _IO_old_file_finish), | |
JUMP_INIT(overflow, _IO_old_file_overflow), | |
JUMP_INIT(underflow, _IO_old_file_underflow), | |
JUMP_INIT(uflow, _IO_default_uflow), | |
JUMP_INIT(pbackfail, _IO_default_pbackfail), | |
JUMP_INIT(xsputn, _IO_old_file_xsputn), | |
JUMP_INIT(xsgetn, _IO_default_xsgetn), | |
JUMP_INIT(seekoff, _IO_old_file_seekoff), | |
JUMP_INIT(seekpos, _IO_default_seekpos), | |
JUMP_INIT(setbuf, _IO_old_file_setbuf), | |
JUMP_INIT(sync, _IO_old_file_sync), | |
JUMP_INIT(doallocate, _IO_file_doallocate), | |
JUMP_INIT(read, _IO_file_read), | |
JUMP_INIT(write, _IO_old_file_write), | |
JUMP_INIT(seek, _IO_file_seek), | |
JUMP_INIT(close, _IO_old_proc_close), | |
JUMP_INIT(stat, _IO_file_stat), | |
JUMP_INIT(showmanyc, _IO_default_showmanyc), | |
JUMP_INIT(imbue, _IO_default_imbue) | |
}; | |
strong_alias (_IO_old_popen, __old_popen) | |
compat_symbol (libc, _IO_old_popen, _IO_popen, GLIBC_2_0); | |
compat_symbol (libc, __old_popen, popen, GLIBC_2_0); | |
compat_symbol (libc, _IO_old_proc_open, _IO_proc_open, GLIBC_2_0); | |
compat_symbol (libc, _IO_old_proc_close, _IO_proc_close, GLIBC_2_0); | |
#endif |