diff options
Diffstat (limited to 'libio/oldiopopen.c')
| -rw-r--r-- | libio/oldiopopen.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/libio/oldiopopen.c b/libio/oldiopopen.c new file mode 100644 index 0000000000..c2e7f25707 --- /dev/null +++ b/libio/oldiopopen.c @@ -0,0 +1,282 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU IO Library. + Written by Per Bothner <bothner@cygnus.com>. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this library; see the file COPYING. If not, write to + the Free Software Foundation, 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA. + + As a special exception, if you link this library with files + compiled with a GNU compiler to produce an executable, this does + not cause the resulting executable to be covered by the GNU General + Public License. This exception does not however invalidate any + other reasons why the executable file might be covered by the GNU + General Public License. */ + +#define _IO_USE_OLD_IO_FILE +#ifndef _POSIX_SOURCE +# define _POSIX_SOURCE +#endif +#include "libioP.h" +#if _IO_HAVE_SYS_WAIT +#include <signal.h> +#include <unistd.h> +#ifdef __STDC__ +#include <stdlib.h> +#endif +#ifdef _LIBC +# include <unistd.h> +#endif +#include <sys/types.h> +#include <sys/wait.h> + +#ifndef _IO_fork +#ifdef _LIBC +#define _IO_fork __vfork +#else +#define _IO_fork vfork /* defined in libiberty, if needed */ +#endif +extern _IO_pid_t _IO_fork __P ((void)); +#endif + +#endif /* _IO_HAVE_SYS_WAIT */ + +#ifndef _IO_pipe +#ifdef _LIBC +#define _IO_pipe __pipe +#else +#define _IO_pipe pipe +#endif +extern int _IO_pipe __P ((int des[2])); +#endif + +#ifndef _IO_dup2 +#ifdef _LIBC +#define _IO_dup2 __dup2 +#else +#define _IO_dup2 dup2 +#endif +extern int _IO_dup2 __P ((int fd, int fd2)); +#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_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 = NULL; + +_IO_FILE * +_IO_old_proc_open (fp, command, mode) + _IO_FILE *fp; + const char *command; + const char *mode; +{ +#if _IO_HAVE_SYS_WAIT + 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 + { + __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; + _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." */ + while (old_proc_file_chain) + { + _IO_close (_IO_fileno ((_IO_FILE *) old_proc_file_chain)); + old_proc_file_chain = old_proc_file_chain->next; + } + + _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. */ + ((_IO_proc_file *) fp)->next = old_proc_file_chain; + old_proc_file_chain = (_IO_proc_file *) fp; + + _IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES); + return fp; +#else /* !_IO_HAVE_SYS_WAIT */ + return NULL; +#endif +} + +_IO_FILE * +_IO_old_popen (command, mode) + 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._lock = &new_f->lock; +#endif + fp = &new_f->fpx.file.file; + _IO_init (fp, 0); + _IO_JUMPS (fp) = &_IO_old_proc_jumps; + _IO_old_file_init (fp); +#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 (fp); + free (new_f); + return NULL; +} + +int +_IO_old_proc_close (fp) + _IO_FILE *fp; +{ + /* This is not name-space clean. FIXME! */ +#if _IO_HAVE_SYS_WAIT + int wstatus; + _IO_proc_file **ptr = &old_proc_file_chain; + _IO_pid_t wait_pid; + int status = -1; + + /* Unlink from old_proc_file_chain. */ + for ( ; *ptr != NULL; ptr = &(*ptr)->next) + { + if (*ptr == (_IO_proc_file *) fp) + { + *ptr = (*ptr)->next; + status = 0; + break; + } + } + + 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; +#else /* !_IO_HAVE_SYS_WAIT */ + return -1; +#endif +} + +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) +symbol_version (_IO_old_popen, _IO_popen, GLIBC_2.0); +symbol_version (__old_popen, popen, GLIBC_2.0); +symbol_version (_IO_old_proc_open, _IO_proc_open, GLIBC_2.0); +symbol_version (_IO_old_proc_close, _IO_proc_close, GLIBC_2.0); |