mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
c66dfaddf4
* configure.ac: Don't use -Wnested-externs, as it's incompatible with the new verify.h implementation. * data/c.m4 (b4_yy_symbol_print_generate): YYUSE (yyoutput). * data/glr.c (YYUSE): Depend on __GNUC__ as well. * data/yacc.c (YYUSE): Likewise. * data/lalr1.cc (yysyntax_error_): YYUSE (yystate). * lib/subpipe.c (end_of_output_subpipe): The args are unused. * src/parse-gram.y (declaration): Don't pass a string constant to a function that expects char *, since GCC might complain about the constant value. * src/reader.c (symbol_typed_p): Add parens to pacify GCC. * tests/cxx-type.at (_AT_TEST_GLR_CXXTYPES): #undef yylloc and yylval before #defining them. * tests/glr-regression.at (Incorrectly initialized location for empty right-hand side in GLR): In yyerror, use the msg arg. (Corrupted semantic options if user action cuts parse): (Incorrect lookahead during deterministic GLR): (Incorrect lookahead during nondeterministic GLR): Don't name a local var 'index'; it shadows string.h's 'index'.
187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
/* Subprocesses with pipes.
|
|
|
|
Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
|
|
|
|
This program 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 program 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 program; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* Written by Paul Eggert <eggert@twinsun.com>
|
|
and Florian Krohm <florian@edamail.fishkill.ibm.com>. */
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include "subpipe.h"
|
|
|
|
#include <errno.h>
|
|
|
|
#include <signal.h>
|
|
#if ! defined SIGCHLD && defined SIGCLD
|
|
# define SIGCHLD SIGCLD
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
|
|
#if HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
#ifndef STDIN_FILENO
|
|
# define STDIN_FILENO 0
|
|
#endif
|
|
#ifndef STDOUT_FILENO
|
|
# define STDOUT_FILENO 1
|
|
#endif
|
|
#if ! HAVE_DUP2 && ! defined dup2
|
|
# include <fcntl.h>
|
|
# define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t))
|
|
#endif
|
|
|
|
#if HAVE_SYS_WAIT_H
|
|
# include <sys/wait.h>
|
|
#endif
|
|
#ifndef WEXITSTATUS
|
|
# define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
|
|
#endif
|
|
#ifndef WIFEXITED
|
|
# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
|
|
#endif
|
|
|
|
#if HAVE_VFORK_H
|
|
# include <vfork.h>
|
|
#endif
|
|
#if ! HAVE_WORKING_VFORK
|
|
# define vfork fork
|
|
#endif
|
|
|
|
#include "error.h"
|
|
#include "unistd-safer.h"
|
|
|
|
#include "gettext.h"
|
|
#define _(Msgid) gettext (Msgid)
|
|
|
|
#ifndef __attribute__
|
|
/* This feature is available in gcc versions 2.5 and later. */
|
|
# if !defined (__GNUC__) || __GNUC__ < 2 || \
|
|
(__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
|
|
# define __attribute__(Spec) /* empty */
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef ATTRIBUTE_UNUSED
|
|
# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
|
|
#endif
|
|
|
|
|
|
/* Initialize this module. */
|
|
|
|
void
|
|
init_subpipe (void)
|
|
{
|
|
#ifdef SIGCHLD
|
|
/* System V fork+wait does not work if SIGCHLD is ignored. */
|
|
signal (SIGCHLD, SIG_DFL);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* Create a subprocess that is run as a filter. ARGV is the
|
|
NULL-terminated argument vector for the subprocess. Store read and
|
|
write file descriptors for communication with the subprocess into
|
|
FD[0] and FD[1]: input meant for the process can be written into
|
|
FD[0], and output from the process can be read from FD[1]. Return
|
|
the subprocess id.
|
|
|
|
To avoid deadlock, the invoker must not let incoming data pile up
|
|
in FD[1] while writing data to FD[0]. */
|
|
|
|
pid_t
|
|
create_subpipe (char const * const *argv, int fd[2])
|
|
{
|
|
int pipe_fd[2];
|
|
int child_fd[2];
|
|
pid_t pid;
|
|
|
|
if (pipe (child_fd) != 0
|
|
|| (child_fd[0] = fd_safer (child_fd[0])) < 0
|
|
|| (fd[0] = fd_safer (child_fd[1])) < 0
|
|
|| pipe (pipe_fd) != 0
|
|
|| (fd[1] = fd_safer (pipe_fd[0])) < 0
|
|
|| (child_fd[1] = fd_safer (pipe_fd[1])) < 0)
|
|
error (EXIT_FAILURE, errno,
|
|
"pipe");
|
|
|
|
pid = vfork ();
|
|
if (pid < 0)
|
|
error (EXIT_FAILURE, errno,
|
|
"fork");
|
|
|
|
if (! pid)
|
|
{
|
|
/* Child. */
|
|
close (fd[0]);
|
|
close (fd[1]);
|
|
dup2 (child_fd[0], STDIN_FILENO);
|
|
close (child_fd[0]);
|
|
dup2 (child_fd[1], STDOUT_FILENO);
|
|
close (child_fd[1]);
|
|
|
|
/* The cast to (char **) rather than (char * const *) is needed
|
|
for portability to older hosts with a nonstandard prototype
|
|
for execvp. */
|
|
execvp (argv[0], (char **) argv);
|
|
|
|
_exit (errno == ENOENT ? 127 : 126);
|
|
}
|
|
|
|
/* Parent. */
|
|
close (child_fd[0]);
|
|
close (child_fd[1]);
|
|
return pid;
|
|
}
|
|
|
|
|
|
/* Wait for the subprocess to exit. */
|
|
|
|
void
|
|
reap_subpipe (pid_t pid, char const *program)
|
|
{
|
|
#if HAVE_WAITPID || defined waitpid
|
|
int wstatus;
|
|
if (waitpid (pid, &wstatus, 0) < 0)
|
|
error (EXIT_FAILURE, errno,
|
|
"waitpid");
|
|
else
|
|
{
|
|
int status = WIFEXITED (wstatus) ? WEXITSTATUS (wstatus) : -1;
|
|
if (status)
|
|
error (EXIT_FAILURE, 0,
|
|
_(status == 126
|
|
? "subsidiary program `%s' could not be invoked"
|
|
: status == 127
|
|
? "subsidiary program `%s' not found"
|
|
: status < 0
|
|
? "subsidiary program `%s' failed"
|
|
: "subsidiary program `%s' failed (exit status %d)"),
|
|
program, status);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void
|
|
end_of_output_subpipe (pid_t pid ATTRIBUTE_UNUSED,
|
|
int fd[2] ATTRIBUTE_UNUSED)
|
|
{
|
|
}
|