spawn: Introduce helper to open /dev/null on all standard fds

This will be used in crash-manager to invoke processes in
"non-blocking" way.

Change-Id: Ic70eda38c7cba8628e635ba206f1fe81edb944eb

diff --git a/src/shared/spawn.c b/src/shared/spawn.c
index 84d2db9..7139f73 100644 (file)
--- a/src/shared/spawn.c
+++ b/src/shared/spawn.c
@@ -48,6 +48,15 @@ int spawn_setstdouterr(spawn_param_u *param)
        return dup2(param->int_val, STDOUT_FILENO) < 0 || dup2(param->int_val, STDERR_FILENO) < 0 ? -1 : 0;
 }
 
+int spawn_nullstdfds(spawn_param_u *param)
+{
+       int fd = open("/dev/null", O_RDWR);
+       int ret = dup2(fd, STDIN_FILENO) < 0 || dup2(fd, STDOUT_FILENO) < 0 || dup2(fd, STDERR_FILENO) < 0 ? -1 : 0;
+       if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO)
+               close(fd);
+       return ret;
+}
+
 int spawn_chdir(spawn_param_u *param)
 {
        assert(param);

diff --git a/src/shared/spawn.h b/src/shared/spawn.h
index f553a9f..7177ae8 100644 (file)
--- a/src/shared/spawn.h
+++ b/src/shared/spawn.h
@@ -36,6 +36,7 @@ typedef int (*spawn_prepare_fn)(spawn_param_u *param);
 
 int spawn_setstdout(spawn_param_u *param);
 int spawn_setstdouterr(spawn_param_u *param);
+int spawn_nullstdfds(spawn_param_u *param);
 int spawn_chdir(spawn_param_u *param);
 int spawn_umask(spawn_param_u *param);