diff options
| -rw-r--r-- | NEWS | 4 | ||||
| -rw-r--r-- | libguile/posix.c | 19 |
2 files changed, 21 insertions, 2 deletions
@@ -24,7 +24,9 @@ the compiler reports it as "possibly unused". * Bug fixes ** (ice-9 suspendable-ports) incorrect UTF-8 decoding - (https://bugs.gnu.org/62290) + (<https://bugs.gnu.org/62290>) +** Fix invalid use of 'posix_spawn' on non-glibc systems + (<https://bugs.gnu.org/61095>) ** Hashing of UTF-8 symbols with non-ASCII characters avoids corruption (<https://bugs.gnu.org/56413>) diff --git a/libguile/posix.c b/libguile/posix.c index 3a8be94e4..68e9bfade 100644 --- a/libguile/posix.c +++ b/libguile/posix.c @@ -1326,7 +1326,24 @@ static void close_inherited_fds_slow (posix_spawn_file_actions_t *actions, int max_fd) { while (--max_fd > 2) - posix_spawn_file_actions_addclose (actions, max_fd); + { + /* Adding a 'close' action for a file descriptor that is not open + causes 'posix_spawn' to fail on GNU/Hurd and on OpenBSD, but + not on GNU/Linux: <https://bugs.gnu.org/61095>. Hence this + strategy: + + - On GNU/Linux, close every FD, since that's the only + race-free way to make sure the child doesn't inherit one. + - On other systems, only close FDs currently open in the + parent; it works, but it's racy (XXX). + + The only reliable option is 'addclosefrom'. */ +#if ! (defined __GLIBC__ && defined __linux__) + int flags = fcntl (max_fd, F_GETFD, NULL); + if (flags >= 0) +#endif + posix_spawn_file_actions_addclose (actions, max_fd); + } } static void |