civodul pushed a commit to branch wip-posix-spawn
in repository guile.
commit ab5afab476f12d1b8a539916a46467d4e8c237ae
Author: Josselin Poiret <d...@jpoiret.xyz>
AuthorDate: Mon Sep 5 08:48:14 2022 +0200
Add spawn*.
* libguile/posix.c: Include spawn.h from Gnulib.
(scm_spawn_process): New function.
(scm_init_popen): Define spawn*.
Signed-off-by: Ludovic Courtès <l...@gnu.org>
---
libguile/posix.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/libguile/posix.c b/libguile/posix.c
index b5352c2c4..dea5ca382 100644
--- a/libguile/posix.c
+++ b/libguile/posix.c
@@ -33,6 +33,7 @@
#include <sys/types.h>
#include <uniconv.h>
#include <unistd.h>
+#include <spawn.h>
#ifdef HAVE_SCHED_H
# include <sched.h>
@@ -1500,6 +1501,75 @@ scm_piped_process (SCM prog, SCM args, SCM from, SCM to)
}
#undef FUNC_NAME
+static SCM
+scm_spawn_process (SCM prog, SCM args, SCM scm_in, SCM scm_out, SCM scm_err)
+#define FUNC_NAME "spawn*"
+{
+ int in, out, err;
+ int pid;
+ char *exec_file;
+ char **exec_argv;
+ char **exec_env = NULL;
+
+ posix_spawn_file_actions_t actions;
+ posix_spawnattr_t *attrp = NULL;
+
+ exec_file = scm_to_locale_string (prog);
+ exec_argv = scm_i_allocate_string_pointers (args);
+
+ in = scm_to_int (scm_in);
+ out = scm_to_int (scm_out);
+ err = scm_to_int (scm_err);
+
+ int max_fd = 1024;
+
+#if defined (HAVE_GETRLIMIT) && defined (RLIMIT_NOFILE)
+ {
+ struct rlimit lim = { 0, 0 };
+ if (getrlimit (RLIMIT_NOFILE, &lim) == 0)
+ max_fd = lim.rlim_cur;
+ }
+#endif
+
+ posix_spawn_file_actions_init (&actions);
+
+ int free_fd_slots = 0;
+ int fd_slot[3];
+
+ for (int fdnum = 3;free_fd_slots < 3 && fdnum < max_fd;fdnum++)
+ {
+ if (fdnum != in && fdnum != out && fdnum != err)
+ {
+ fd_slot[free_fd_slots] = fdnum;
+ free_fd_slots++;
+ }
+ }
+
+ /* Move the fds out of the way, so that duplicate fds or fds equal
+ to 0, 1, 2 don't trample each other */
+
+ posix_spawn_file_actions_adddup2 (&actions, in, fd_slot[0]);
+ posix_spawn_file_actions_adddup2 (&actions, out, fd_slot[1]);
+ posix_spawn_file_actions_adddup2 (&actions, err, fd_slot[2]);
+ posix_spawn_file_actions_adddup2 (&actions, fd_slot[0], 0);
+ posix_spawn_file_actions_adddup2 (&actions, fd_slot[1], 1);
+ posix_spawn_file_actions_adddup2 (&actions, fd_slot[2], 2);
+
+ while (--max_fd > 2)
+ posix_spawn_file_actions_addclose (&actions, max_fd);
+
+ if (posix_spawnp (&pid, exec_file, &actions, attrp, exec_argv, environ) != 0)
+ {
+ int errno_save = errno;
+ free (exec_file);
+ errno = errno_save;
+ SCM_SYSERROR;
+ }
+
+ return scm_from_int (pid);
+}
+#undef FUNC_NAME
+
static void
restore_sigaction (SCM pair)
{
@@ -2421,6 +2491,7 @@ static void
scm_init_popen (void)
{
scm_c_define_gsubr ("piped-process", 2, 2, 0, scm_piped_process);
+ scm_c_define_gsubr ("spawn*", 5, 0, 0, scm_spawn_process);
}
#endif /* HAVE_START_CHILD */
