Add Gnulib modules for 'posix_spawn' file operations.

This is again from Gnulib v0.1-5703-g356a414e8c.

* m4/gnulib-cache.m4: Add 'posix_spawn_file_actions_addclose',
'posix_spawn_file_actions_adddup2',
'posix_spawn_file_actions_addopen', and
'posix_spawn_file_actions_init'.

7 files changed, 366 insertions, 0 deletions

diff --git a/lib/Makefile.am b/lib/Makefile.am
index c3223052f..eddfa7282 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -111,6 +111,10 @@
 #  pipe2 \
 #  poll \
 #  posix_spawn \
+#  posix_spawn_file_actions_addclose \
+#  posix_spawn_file_actions_adddup2 \
+#  posix_spawn_file_actions_addopen \
+#  posix_spawn_file_actions_init \
 #  posix_spawnp \
 #  putenv \
 #  readlink \
@@ -2068,6 +2072,46 @@ EXTRA_DIST += spawn_int.h
 
 ## end   gnulib module posix_spawn-internal
 
+## begin gnulib module posix_spawn_file_actions_addclose
+
+if GL_COND_OBJ_SPAWN_FACTION_ADDCLOSE
+libgnu_la_SOURCES += spawn_faction_addclose.c
+endif
+
+EXTRA_DIST += spawn_int.h
+
+## end   gnulib module posix_spawn_file_actions_addclose
+
+## begin gnulib module posix_spawn_file_actions_adddup2
+
+if GL_COND_OBJ_SPAWN_FACTION_ADDDUP2
+libgnu_la_SOURCES += spawn_faction_adddup2.c
+endif
+
+EXTRA_DIST += spawn_int.h
+
+## end   gnulib module posix_spawn_file_actions_adddup2
+
+## begin gnulib module posix_spawn_file_actions_addopen
+
+if GL_COND_OBJ_SPAWN_FACTION_ADDOPEN
+libgnu_la_SOURCES += spawn_faction_addopen.c
+endif
+
+EXTRA_DIST += spawn_int.h
+
+## end   gnulib module posix_spawn_file_actions_addopen
+
+## begin gnulib module posix_spawn_file_actions_init
+
+if GL_COND_OBJ_SPAWN_FACTION_INIT
+libgnu_la_SOURCES += spawn_faction_init.c
+endif
+
+EXTRA_DIST += spawn_int.h
+
+## end   gnulib module posix_spawn_file_actions_init
+
 ## begin gnulib module posix_spawnp
 
 if GL_COND_OBJ_SPAWNP
diff --git a/lib/spawn_faction_addclose.c b/lib/spawn_faction_addclose.c
new file mode 100644
index 000000000..c87a23794
--- /dev/null
+++ b/lib/spawn_faction_addclose.c
@@ -0,0 +1,69 @@
+/* Copyright (C) 2000, 2009-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <spawn.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#if !_LIBC
+# define __sysconf(open_max) getdtablesize ()
+#endif
+
+#if REPLACE_POSIX_SPAWN
+# include "spawn_int.h"
+#endif
+
+/* Add an action to FILE-ACTIONS which tells the implementation to call
+   'close' for the given file descriptor during the 'spawn' call.  */
+int
+posix_spawn_file_actions_addclose (posix_spawn_file_actions_t *file_actions,
+                                   int fd)
+#undef posix_spawn_file_actions_addclose
+{
+  int maxfd = __sysconf (_SC_OPEN_MAX);
+
+  /* Test for the validity of the file descriptor.  */
+  if (fd < 0 || fd >= maxfd)
+    return EBADF;
+
+#if !REPLACE_POSIX_SPAWN
+  return posix_spawn_file_actions_addclose (file_actions, fd);
+#else
+  /* Allocate more memory if needed.  */
+  if (file_actions->_used == file_actions->_allocated
+      && __posix_spawn_file_actions_realloc (file_actions) != 0)
+    /* This can only mean we ran out of memory.  */
+    return ENOMEM;
+
+  {
+    struct __spawn_action *rec;
+
+    /* Add the new value.  */
+    rec = &file_actions->_actions[file_actions->_used];
+    rec->tag = spawn_do_close;
+    rec->action.open_action.fd = fd;
+
+    /* Account for the new entry.  */
+    ++file_actions->_used;
+
+    return 0;
+  }
+#endif
+}
diff --git a/lib/spawn_faction_adddup2.c b/lib/spawn_faction_adddup2.c
new file mode 100644
index 000000000..27f4aa314
--- /dev/null
+++ b/lib/spawn_faction_adddup2.c
@@ -0,0 +1,70 @@
+/* Copyright (C) 2000, 2009-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <spawn.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#if !_LIBC
+# define __sysconf(open_max) getdtablesize ()
+#endif
+
+#if REPLACE_POSIX_SPAWN
+# include "spawn_int.h"
+#endif
+
+/* Add an action to FILE-ACTIONS which tells the implementation to call
+   'dup2' for the given file descriptors during the 'spawn' call.  */
+int
+posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions,
+                                  int fd, int newfd)
+#undef posix_spawn_file_actions_adddup2
+{
+  int maxfd = __sysconf (_SC_OPEN_MAX);
+
+  /* Test for the validity of the file descriptor.  */
+  if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd)
+    return EBADF;
+
+#if !REPLACE_POSIX_SPAWN
+  return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd);
+#else
+  /* Allocate more memory if needed.  */
+  if (file_actions->_used == file_actions->_allocated
+      && __posix_spawn_file_actions_realloc (file_actions) != 0)
+    /* This can only mean we ran out of memory.  */
+    return ENOMEM;
+
+  {
+    struct __spawn_action *rec;
+
+    /* Add the new value.  */
+    rec = &file_actions->_actions[file_actions->_used];
+    rec->tag = spawn_do_dup2;
+    rec->action.dup2_action.fd = fd;
+    rec->action.dup2_action.newfd = newfd;
+
+    /* Account for the new entry.  */
+    ++file_actions->_used;
+
+    return 0;
+  }
+#endif
+}
diff --git a/lib/spawn_faction_addopen.c b/lib/spawn_faction_addopen.c
new file mode 100644
index 000000000..fa3e1cb49
--- /dev/null
+++ b/lib/spawn_faction_addopen.c
@@ -0,0 +1,86 @@
+/* Copyright (C) 2000, 2009-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <spawn.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#if !_LIBC
+# define __sysconf(open_max) getdtablesize ()
+#endif
+
+#if REPLACE_POSIX_SPAWN
+# include "spawn_int.h"
+#endif
+
+/* Add an action to FILE-ACTIONS which tells the implementation to call
+   'open' for the given file during the 'spawn' call.  */
+int
+posix_spawn_file_actions_addopen (posix_spawn_file_actions_t *file_actions,
+                                  int fd, const char *path, int oflag,
+                                  mode_t mode)
+#undef posix_spawn_file_actions_addopen
+{
+  int maxfd = __sysconf (_SC_OPEN_MAX);
+
+  /* Test for the validity of the file descriptor.  */
+  if (fd < 0 || fd >= maxfd)
+    return EBADF;
+
+#if !REPLACE_POSIX_SPAWN
+  return posix_spawn_file_actions_addopen (file_actions, fd, path, oflag, mode);
+#else
+  {
+    /* Copy PATH, because the caller may free it before calling posix_spawn()
+       or posix_spawnp().  */
+    char *path_copy = strdup (path);
+    if (path_copy == NULL)
+      return ENOMEM;
+
+    /* Allocate more memory if needed.  */
+    if (file_actions->_used == file_actions->_allocated
+        && __posix_spawn_file_actions_realloc (file_actions) != 0)
+      {
+        /* This can only mean we ran out of memory.  */
+        free (path_copy);
+        return ENOMEM;
+      }
+
+    {
+      struct __spawn_action *rec;
+
+      /* Add the new value.  */
+      rec = &file_actions->_actions[file_actions->_used];
+      rec->tag = spawn_do_open;
+      rec->action.open_action.fd = fd;
+      rec->action.open_action.path = path_copy;
+      rec->action.open_action.oflag = oflag;
+      rec->action.open_action.mode = mode;
+
+      /* Account for the new entry.  */
+      ++file_actions->_used;
+
+      return 0;
+    }
+  }
+#endif
+}
diff --git a/lib/spawn_faction_init.c b/lib/spawn_faction_init.c
new file mode 100644
index 000000000..12089d9de
--- /dev/null
+++ b/lib/spawn_faction_init.c
@@ -0,0 +1,56 @@
+/* Copyright (C) 2000, 2009-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <spawn.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "spawn_int.h"
+
+
+/* Function used to increase the size of the allocated array.  This
+   function is called from the 'add'-functions.  */
+int
+__posix_spawn_file_actions_realloc (posix_spawn_file_actions_t *file_actions)
+{
+  int newalloc = file_actions->_allocated + 8;
+  void *newmem = realloc (file_actions->_actions,
+                          newalloc * sizeof (struct __spawn_action));
+
+  if (newmem == NULL)
+    /* Not enough memory.  */
+    return ENOMEM;
+
+  file_actions->_actions = (struct __spawn_action *) newmem;
+  file_actions->_allocated = newalloc;
+
+  return 0;
+}
+
+
+/* Initialize data structure for file attribute for 'spawn' call.  */
+int
+posix_spawn_file_actions_init (posix_spawn_file_actions_t *file_actions)
+{
+  /* Simply clear all the elements.  */
+  memset (file_actions, '\0', sizeof (*file_actions));
+  return 0;
+}
diff --git a/m4/gnulib-cache.m4 b/m4/gnulib-cache.m4
index d9c27f935..cb3a403df 100644
--- a/m4/gnulib-cache.m4
+++ b/m4/gnulib-cache.m4
@@ -116,6 +116,10 @@
 #  pipe2 \
 #  poll \
 #  posix_spawn \
+#  posix_spawn_file_actions_addclose \
+#  posix_spawn_file_actions_adddup2 \
+#  posix_spawn_file_actions_addopen \
+#  posix_spawn_file_actions_init \
 #  posix_spawnp \
 #  putenv \
 #  readlink \
@@ -217,6 +221,10 @@ gl_MODULES([
   pipe2
   poll
   posix_spawn
+  posix_spawn_file_actions_addclose
+  posix_spawn_file_actions_adddup2
+  posix_spawn_file_actions_addopen
+  posix_spawn_file_actions_init
   posix_spawnp
   putenv
   readlink
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 1187c1a6a..215acc1e7 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -194,6 +194,10 @@ AC_DEFUN([gl_EARLY],
   # Code from module poll-h:
   # Code from module posix_spawn:
   # Code from module posix_spawn-internal:
+  # Code from module posix_spawn_file_actions_addclose:
+  # Code from module posix_spawn_file_actions_adddup2:
+  # Code from module posix_spawn_file_actions_addopen:
+  # Code from module posix_spawn_file_actions_init:
   # Code from module posix_spawnp:
   # Code from module putenv:
   # Code from module raise:
@@ -622,6 +626,22 @@ AC_DEFUN([gl_INIT],
   gl_CONDITIONAL([GL_COND_OBJ_SPAWN],
                  [test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1])
   gl_SPAWN_MODULE_INDICATOR([posix_spawn])
+  gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE
+  gl_CONDITIONAL([GL_COND_OBJ_SPAWN_FACTION_ADDCLOSE],
+                 [test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1 || test $REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE = 1])
+  gl_SPAWN_MODULE_INDICATOR([posix_spawn_file_actions_addclose])
+  gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2
+  gl_CONDITIONAL([GL_COND_OBJ_SPAWN_FACTION_ADDDUP2],
+                 [test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1 || test $REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2 = 1])
+  gl_SPAWN_MODULE_INDICATOR([posix_spawn_file_actions_adddup2])
+  gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN
+  gl_CONDITIONAL([GL_COND_OBJ_SPAWN_FACTION_ADDOPEN],
+                 [test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1 || test $REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN = 1])
+  gl_SPAWN_MODULE_INDICATOR([posix_spawn_file_actions_addopen])
+  gl_POSIX_SPAWN
+  gl_CONDITIONAL([GL_COND_OBJ_SPAWN_FACTION_INIT],
+                 [test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1])
+  gl_SPAWN_MODULE_INDICATOR([posix_spawn_file_actions_init])
   gl_POSIX_SPAWN
   gl_CONDITIONAL([GL_COND_OBJ_SPAWNP],
                  [test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1])
@@ -1704,6 +1724,15 @@ AC_SUBST([LTALLOCA])
   if test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1; then
     func_gl_gnulib_m4code_332607f759618fb73dfc3076748afea7
   fi
+  if test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1 || test $REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE = 1; then
+    func_gl_gnulib_m4code_getdtablesize
+  fi
+  if test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1 || test $REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2 = 1; then
+    func_gl_gnulib_m4code_getdtablesize
+  fi
+  if test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1 || test $REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN = 1; then
+    func_gl_gnulib_m4code_getdtablesize
+  fi
   if test $HAVE_POSIX_SPAWN = 0 || test $REPLACE_POSIX_SPAWN = 1; then
     func_gl_gnulib_m4code_332607f759618fb73dfc3076748afea7
   fi
@@ -2232,6 +2261,10 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/sockets.h
   lib/spawn.c
   lib/spawn.in.h
+  lib/spawn_faction_addclose.c
+  lib/spawn_faction_adddup2.c
+  lib/spawn_faction_addopen.c
+  lib/spawn_faction_init.c
   lib/spawn_int.h
   lib/spawni.c
   lib/spawnp.c