Update copyright years.

[thirdparty/gcc.git] / libgfortran / intrinsics / execute_command_line.c

diff --git a/libgfortran/intrinsics/execute_command_line.c b/libgfortran/intrinsics/execute_command_line.c
index fa6ea9fbc34c8f89373e28325cc01d4d89e93632..9bf009e0f620daa4ff62b0f8be3a34b9f6fbab01 100644 (file)
--- a/libgfortran/intrinsics/execute_command_line.c
+++ b/libgfortran/intrinsics/execute_command_line.c
@@ -1,6 +1,6 @@
 /* Implementation of the EXECUTE_COMMAND_LINE intrinsic.
-   Copyright (C) 2009-2013 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).
 
@@ -25,8 +25,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #include "libgfortran.h"
 #include <string.h>
-#include <stdbool.h>
-#include <stdlib.h>
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
@@ -34,14 +32,26 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #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" };
 
 
 
@@ -51,10 +61,23 @@ set_cmdstat (int *cmdstat, int value)
   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,
@@ -62,14 +85,12 @@ execute_command_line (const char *command, bool wait, int *exitstat,
                      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.  */
@@ -77,14 +98,35 @@ execute_command_line (const char *command, bool wait, int *exitstat,
 
       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
@@ -94,10 +136,24 @@ execute_command_line (const char *command, bool wait, int *exitstat,
 
       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);
 
@@ -111,16 +167,12 @@ execute_command_line (const char *command, bool wait, int *exitstat,
        }
     }
 
+  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]);
-    }
 }
 
 
@@ -140,6 +192,8 @@ execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
   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;
 
@@ -169,6 +223,8 @@ execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
   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;