230 lines
6.3 KiB
C
230 lines
6.3 KiB
C
/* Implementation of the EXECUTE_COMMAND_LINE intrinsic.
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Copyright (C) 2009-2021 Free Software Foundation, Inc.
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Contributed by François-Xavier Coudert.
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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Libgfortran is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_POSIX_SPAWN
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#include <spawn.h>
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# ifdef __APPLE__
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# include <crt_externs.h>
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# define environ (*_NSGetEnviron ())
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# else
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extern char **environ;
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# endif
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#endif
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#if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK)
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#include <signal.h>
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#endif
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enum { EXEC_SYNCHRONOUS = -2, EXEC_NOERROR = 0, EXEC_SYSTEMFAILED,
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EXEC_CHILDFAILED, EXEC_INVALIDCOMMAND };
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static const char *cmdmsg_values[] =
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{ "",
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"Termination status of the command-language interpreter cannot be obtained",
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"Execution of child process impossible",
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"Invalid command line" };
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static void
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set_cmdstat (int *cmdstat, int value)
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{
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if (cmdstat)
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*cmdstat = value;
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else if (value > EXEC_NOERROR)
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{
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#define MSGLEN 200
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char msg[MSGLEN] = "EXECUTE_COMMAND_LINE: ";
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strncat (msg, cmdmsg_values[value], MSGLEN - strlen(msg) - 1);
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runtime_error ("%s", msg);
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}
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}
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#if defined(HAVE_WAITPID) && defined(HAVE_SIGACTION)
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static void
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sigchld_handler (int signum __attribute__((unused)))
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{
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while (waitpid ((pid_t)(-1), NULL, WNOHANG) > 0) {}
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}
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#endif
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static void
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execute_command_line (const char *command, bool wait, int *exitstat,
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int *cmdstat, char *cmdmsg,
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gfc_charlen_type command_len,
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gfc_charlen_type cmdmsg_len)
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{
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/* Transform the Fortran string to a C string. */
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char *cmd = fc_strdup (command, command_len);
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/* Flush all I/O units before executing the command. */
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flush_all_units();
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#if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK)
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if (!wait)
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{
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/* Asynchronous execution. */
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pid_t pid;
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set_cmdstat (cmdstat, EXEC_NOERROR);
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#if defined(HAVE_SIGACTION) && defined(HAVE_WAITPID)
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static bool sig_init_saved;
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bool sig_init = __atomic_load_n (&sig_init_saved, __ATOMIC_RELAXED);
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if (!sig_init)
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{
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struct sigaction sa;
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sa.sa_handler = &sigchld_handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
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sigaction(SIGCHLD, &sa, 0);
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__atomic_store_n (&sig_init_saved, true, __ATOMIC_RELAXED);
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}
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#endif
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#ifdef HAVE_POSIX_SPAWN
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const char * const argv[] = {"sh", "-c", cmd, NULL};
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if (posix_spawn (&pid, "/bin/sh", NULL, NULL,
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(char * const* restrict) argv, environ))
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set_cmdstat (cmdstat, EXEC_CHILDFAILED);
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#elif defined(HAVE_FORK)
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if ((pid = fork()) < 0)
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set_cmdstat (cmdstat, EXEC_CHILDFAILED);
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else if (pid == 0)
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{
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/* Child process. */
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int res = system (cmd);
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_exit (WIFEXITED(res) ? WEXITSTATUS(res) : res);
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}
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#endif
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}
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else
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#endif
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{
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/* Synchronous execution. */
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int res = system (cmd);
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if (res == -1)
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set_cmdstat (cmdstat, EXEC_SYSTEMFAILED);
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#if !defined(HAVE_POSIX_SPAWN) && !defined(HAVE_FORK)
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else if (!wait)
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set_cmdstat (cmdstat, EXEC_SYNCHRONOUS);
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#endif
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else if (res == 127 || res == 126
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#if defined(WEXITSTATUS) && defined(WIFEXITED)
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|| (WIFEXITED(res) && WEXITSTATUS(res) == 127)
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|| (WIFEXITED(res) && WEXITSTATUS(res) == 126)
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#endif
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)
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/* Shell return codes 126 and 127 mean that the command line could
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not be executed for various reasons. */
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set_cmdstat (cmdstat, EXEC_INVALIDCOMMAND);
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else
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set_cmdstat (cmdstat, EXEC_NOERROR);
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if (res != -1)
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{
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#if defined(WEXITSTATUS) && defined(WIFEXITED)
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*exitstat = WIFEXITED(res) ? WEXITSTATUS(res) : res;
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#else
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*exitstat = res;
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#endif
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}
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}
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free (cmd);
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/* Now copy back to the Fortran string if needed. */
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if (cmdstat && *cmdstat > EXEC_NOERROR && cmdmsg)
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fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],
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strlen (cmdmsg_values[*cmdstat]));
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}
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extern void
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execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
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GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
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char *cmdmsg, gfc_charlen_type command_len,
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gfc_charlen_type cmdmsg_len);
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export_proto(execute_command_line_i4);
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void
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execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
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GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
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char *cmdmsg, gfc_charlen_type command_len,
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gfc_charlen_type cmdmsg_len)
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{
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bool w = wait ? *wait : true;
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int estat, estat_initial, cstat;
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if (exitstat)
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estat_initial = estat = *exitstat;
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execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL,
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cmdmsg, command_len, cmdmsg_len);
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if (exitstat && estat != estat_initial)
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*exitstat = estat;
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if (cmdstat)
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*cmdstat = cstat;
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}
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extern void
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execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
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GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
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char *cmdmsg, gfc_charlen_type command_len,
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gfc_charlen_type cmdmsg_len);
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export_proto(execute_command_line_i8);
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void
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execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
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GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
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char *cmdmsg, gfc_charlen_type command_len,
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gfc_charlen_type cmdmsg_len)
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{
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bool w = wait ? *wait : true;
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int estat, estat_initial, cstat;
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if (exitstat)
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estat_initial = estat = *exitstat;
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execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL,
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cmdmsg, command_len, cmdmsg_len);
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if (exitstat && estat != estat_initial)
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*exitstat = estat;
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if (cmdstat)
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*cmdstat = cstat;
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}
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