From: Paul Eggert Date: Sun, 20 Oct 2002 06:28:23 +0000 (+0000) Subject: Initial version. X-Git-Tag: BISON-1_875~439 X-Git-Url: https://git.saurik.com/bison.git/commitdiff_plain/5b2d69cc5b852ab2e884fdf76f78d2ee6ff3ff7f Initial version. --- diff --git a/lib/subpipe.c b/lib/subpipe.c new file mode 100644 index 00000000..7bb520a8 --- /dev/null +++ b/lib/subpipe.c @@ -0,0 +1,196 @@ +/* Subprocesses with pipes. + + Copyright (C) 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Paul Eggert + and Florian Krohm . */ + +#if HAVE_CONFIG_H +# include +#endif + +#if HAVE_SYS_TYPES_H +# include +#endif + +#include +#ifndef errno +extern int errno; +#endif + +#include +#if ! defined SIGCHLD && defined SIGCLD +# define SIGCHLD SIGCLD +#endif + +#if HAVE_STDLIB_H +# include +#endif +/* The following test is to work around the gross typo in + systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE + is defined to 0, not 1. */ +#if ! EXIT_FAILURE +# undef EXIT_FAILURE +# define EXIT_FAILURE 1 +#endif + +#if HAVE_UNISTD_H +# include +#endif +#ifndef STDIN_FILENO +# define STDIN_FILENO 0 +#endif +#ifndef STDOUT_FILENO +# define STDOUT_FILENO 1 +#endif +#if ! HAVE_DUP2 && ! defined dup2 +# if HAVE_FCNTL_H +# include +# endif +# define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t)) +#endif + +#if HAVE_SYS_WAIT_H +# include +#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 +#endif +#if ! HAVE_WORKING_VFORK +# define vfork fork +#endif + +#include "error.h" + +#include "gettext.h" +#define _(Msgid) gettext (Msgid) + +#include "subpipe.h" + + +/* 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 from_in_fd; + int from_out_fd; + int to_in_fd; + int to_out_fd; + pid_t pid; + + if (pipe (pipe_fd) != 0) + error (EXIT_FAILURE, errno, "pipe"); + to_in_fd = pipe_fd[0]; + to_out_fd = pipe_fd[1]; + + if (pipe (pipe_fd) != 0) + error (EXIT_FAILURE, errno, "pipe"); + from_in_fd = pipe_fd[0]; + from_out_fd = pipe_fd[1]; + + pid = vfork (); + if (pid < 0) + error (EXIT_FAILURE, errno, "fork"); + + if (! pid) + { + /* Child. */ + close (to_out_fd); + close (from_in_fd); + + if (to_in_fd != STDIN_FILENO) + { + dup2 (to_in_fd, STDIN_FILENO); + close (to_in_fd); + } + if (from_out_fd != STDOUT_FILENO) + { + dup2 (from_out_fd, STDOUT_FILENO); + close (from_out_fd); + } + + /* 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 (to_in_fd); + close (from_out_fd); + fd[0] = to_out_fd; + fd[1] = from_in_fd; + 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 +} diff --git a/lib/subpipe.h b/lib/subpipe.h new file mode 100644 index 00000000..6f4a592f --- /dev/null +++ b/lib/subpipe.h @@ -0,0 +1,26 @@ +/* Subprocesses with pipes. + Copyright (C) 2002 Free Software Foundation, Inc. + + This file is part of Bison, the GNU Compiler Compiler. + + Bison 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. + + Bison 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 Bison; see the file COPYING. If not, write to the Free + Software Foundation, 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +/* Written by Paul Eggert + and Florian Krohm . */ + +void init_subpipe (void); +pid_t create_subpipe (char const * const *, int[2]); +void reap_subpipe (pid_t, char const *); diff --git a/m4/subpipe.m4 b/m4/subpipe.m4 new file mode 100644 index 00000000..d05bd77c --- /dev/null +++ b/m4/subpipe.m4 @@ -0,0 +1,30 @@ +# -*- Autoconf -*- +# Checks required to run `subpipe'. +# +# Copyright (C) 2002 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA +# 02111-1307 USA + +# Written by Paul Eggert . + +AC_DEFUN([BISON_PREREQ_SUBPIPE], +[ + AC_TYPE_PID_T + AC_CHECK_HEADERS([fcntl.h sys/wait.h]) + AC_HEADER_SYS_WAIT + AC_CHECK_FUNCS(dup2 waitpid) + AC_FUNC_FORK +])