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/* Implementation of the EXECUTE_COMMAND_LINE intrinsic.
Copyright (C) 2009-2021 Free Software Foundation, Inc.
Contributed by Fran├žois-Xavier Coudert.
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran 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 3, or (at your option) any later
version.
Libgfortran 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_POSIX_SPAWN
#include <spawn.h>
# ifdef __APPLE__
# include <crt_externs.h>
# define environ (*_NSGetEnviron ())
# else
extern char **environ;
# endif
#endif
#if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK)
#include <signal.h>
#endif
enum { EXEC_SYNCHRONOUS = -2, EXEC_NOERROR = 0, EXEC_SYSTEMFAILED,
EXEC_CHILDFAILED, EXEC_INVALIDCOMMAND };
static const char *cmdmsg_values[] =
{ "",
"Termination status of the command-language interpreter cannot be obtained",
"Execution of child process impossible",
"Invalid command line" };
static void
set_cmdstat (int *cmdstat, int value)
{
if (cmdstat)
*cmdstat = value;
else if (value > EXEC_NOERROR)
{
#define MSGLEN 200
char msg[MSGLEN] = "EXECUTE_COMMAND_LINE: ";
strncat (msg, cmdmsg_values[value], MSGLEN - strlen(msg) - 1);
runtime_error ("%s", msg);
}
}
#if defined(HAVE_WAITPID) && defined(HAVE_SIGACTION)
static void
sigchld_handler (int signum __attribute__((unused)))
{
while (waitpid ((pid_t)(-1), NULL, WNOHANG) > 0) {}
}
#endif
static void
execute_command_line (const char *command, bool wait, int *exitstat,
int *cmdstat, char *cmdmsg,
gfc_charlen_type command_len,
gfc_charlen_type cmdmsg_len)
{
/* Transform the Fortran string to a C string. */
char *cmd = fc_strdup (command, command_len);
/* Flush all I/O units before executing the command. */
flush_all_units();
#if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK)
if (!wait)
{
/* Asynchronous execution. */
pid_t pid;
set_cmdstat (cmdstat, EXEC_NOERROR);
#if defined(HAVE_SIGACTION) && defined(HAVE_WAITPID)
static bool sig_init_saved;
bool sig_init = __atomic_load_n (&sig_init_saved, __ATOMIC_RELAXED);
if (!sig_init)
{
struct sigaction sa;
sa.sa_handler = &sigchld_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
sigaction(SIGCHLD, &sa, 0);
__atomic_store_n (&sig_init_saved, true, __ATOMIC_RELAXED);
}
#endif
#ifdef HAVE_POSIX_SPAWN
const char * const argv[] = {"sh", "-c", cmd, NULL};
if (posix_spawn (&pid, "/bin/sh", NULL, NULL,
(char * const* restrict) argv, environ))
set_cmdstat (cmdstat, EXEC_CHILDFAILED);
#elif defined(HAVE_FORK)
if ((pid = fork()) < 0)
set_cmdstat (cmdstat, EXEC_CHILDFAILED);
else if (pid == 0)
{
/* Child process. */
int res = system (cmd);
_exit (WIFEXITED(res) ? WEXITSTATUS(res) : res);
}
#endif
}
else
#endif
{
/* Synchronous execution. */
int res = system (cmd);
if (res == -1)
set_cmdstat (cmdstat, EXEC_SYSTEMFAILED);
#if !defined(HAVE_POSIX_SPAWN) && !defined(HAVE_FORK)
else if (!wait)
set_cmdstat (cmdstat, EXEC_SYNCHRONOUS);
#endif
else if (res == 127 || res == 126
#if defined(WEXITSTATUS) && defined(WIFEXITED)
|| (WIFEXITED(res) && WEXITSTATUS(res) == 127)
|| (WIFEXITED(res) && WEXITSTATUS(res) == 126)
#endif
)
/* Shell return codes 126 and 127 mean that the command line could
not be executed for various reasons. */
set_cmdstat (cmdstat, EXEC_INVALIDCOMMAND);
else
set_cmdstat (cmdstat, EXEC_NOERROR);
if (res != -1)
{
#if defined(WEXITSTATUS) && defined(WIFEXITED)
*exitstat = WIFEXITED(res) ? WEXITSTATUS(res) : res;
#else
*exitstat = res;
#endif
}
}
free (cmd);
/* Now copy back to the Fortran string if needed. */
if (cmdstat && *cmdstat > EXEC_NOERROR && cmdmsg)
fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],
strlen (cmdmsg_values[*cmdstat]));
}
extern void
execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
char *cmdmsg, gfc_charlen_type command_len,
gfc_charlen_type cmdmsg_len);
export_proto(execute_command_line_i4);
void
execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
char *cmdmsg, gfc_charlen_type command_len,
gfc_charlen_type cmdmsg_len)
{
bool w = wait ? *wait : true;
int estat, estat_initial, cstat;
if (exitstat)
estat_initial = estat = *exitstat;
execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL,
cmdmsg, command_len, cmdmsg_len);
if (exitstat && estat != estat_initial)
*exitstat = estat;
if (cmdstat)
*cmdstat = cstat;
}
extern void
execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
char *cmdmsg, gfc_charlen_type command_len,
gfc_charlen_type cmdmsg_len);
export_proto(execute_command_line_i8);
void
execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
char *cmdmsg, gfc_charlen_type command_len,
gfc_charlen_type cmdmsg_len)
{
bool w = wait ? *wait : true;
int estat, estat_initial, cstat;
if (exitstat)
estat_initial = estat = *exitstat;
execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL,
cmdmsg, command_len, cmdmsg_len);
if (exitstat && estat != estat_initial)
*exitstat = estat;
if (cmdstat)
*cmdstat = cstat;
}