/* Implementation of the EXECUTE_COMMAND_LINE intrinsic.
- Copyright (C) 2009-2014 Free Software Foundation, Inc.
- Contributed by FranÃ\83§ois-Xavier Coudert.
+ Copyright (C) 2009-2024 Free Software Foundation, Inc.
+ Contributed by François-Xavier Coudert.
This file is part of the GNU Fortran runtime library (libgfortran).
#include "libgfortran.h"
#include <string.h>
-#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#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_CHILDFAILED, EXEC_INVALIDCOMMAND };
static const char *cmdmsg_values[] =
{ "",
"Termination status of the command-language interpreter cannot be obtained",
- "Execution of child process impossible" };
+ "Execution of child process impossible",
+ "Invalid command line" };
if (cmdstat)
*cmdstat = value;
else if (value > EXEC_NOERROR)
- runtime_error ("Could not execute command line");
+ {
+#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 cmdmsg_len)
{
/* Transform the Fortran string to a C string. */
- char cmd[command_len + 1];
- memcpy (cmd, command, command_len);
- cmd[command_len] = '\0';
+ char *cmd = fc_strdup (command, command_len);
/* Flush all I/O units before executing the command. */
flush_all_units();
-#if defined(HAVE_FORK)
+#if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK)
if (!wait)
{
/* Asynchronous execution. */
set_cmdstat (cmdstat, EXEC_NOERROR);
- if ((pid = fork()) < 0)
+#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
if (res == -1)
set_cmdstat (cmdstat, EXEC_SYSTEMFAILED);
-#ifndef HAVE_FORK
+#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
+#ifdef __MINGW32__
+ /* cmd.exe sets the errorlevel to 9009,
+ if the command could not be executed. */
+ || res == 9009
+#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);
}
}
+ free (cmd);
+
/* Now copy back to the Fortran string if needed. */
- if (cmdstat && *cmdstat > EXEC_NOERROR)
- {
- if (cmdmsg)
- fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],
+ if (cmdstat && *cmdstat > EXEC_NOERROR && cmdmsg)
+ fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],
strlen (cmdmsg_values[*cmdstat]));
- else
- runtime_error ("Failure in EXECUTE_COMMAND_LINE: %s",
- cmdmsg_values[*cmdstat]);
- }
}
bool w = wait ? *wait : true;
int estat, estat_initial, cstat;
+ estat_initial = 0; /* Avoid nuisance warning if not initialized. */
+
if (exitstat)
estat_initial = estat = *exitstat;
bool w = wait ? *wait : true;
int estat, estat_initial, cstat;
+ estat_initial = 0; /* Avoid nuisance warning if not initialized. */
+
if (exitstat)
estat_initial = estat = *exitstat;