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Merge branch 'darwin-evolves-to-fd-walk' into 'main'

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gspawn: Provide less brute force fdwalk implementation on macOS

See merge request GNOME/glib!3040
This commit is contained in:
Michael Catanzaro 2022-11-02 16:16:34 +00:00
commit 213859e33e
1 changed files with 36 additions and 1 deletions
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37
glib/gspawn.c
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@ -70,6 +70,11 @@
#include "glibintl.h"
#include "glib-unix.h"
#ifdef __APPLE__
#include <libproc.h>
#include <sys/proc_info.h>
#endif
#define INHERITS_OR_NULL_STDIN (G_SPAWN_STDIN_FROM_DEV_NULL | G_SPAWN_CHILD_INHERITS_STDIN)
#define INHERITS_OR_NULL_STDOUT (G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_CHILD_INHERITS_STDOUT)
#define INHERITS_OR_NULL_STDERR (G_SPAWN_STDERR_TO_DEV_NULL | G_SPAWN_CHILD_INHERITS_STDERR)
@ -1533,7 +1538,7 @@ safe_fdwalk_with_invalid_fds (int (*cb)(void *data, int fd), void *data)
if (getrlimit (RLIMIT_NOFILE, &rl) == 0 && rl.rlim_max != RLIM_INFINITY)
open_max = rl.rlim_max;
#endif
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(G_OS_DARWIN)
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
/* Use sysconf() function provided by the system if it is known to be
* async-signal safe.
*
@ -1553,6 +1558,36 @@ safe_fdwalk_with_invalid_fds (int (*cb)(void *data, int fd), void *data)
if (open_max < 0)
open_max = 4096;
#if defined(__APPLE__)
/* proc_pidinfo isn't documented as async-signal-safe but looking at the implementation
* in the darwin tree here:
*
* https://opensource.apple.com/source/Libc/Libc-498/darwin/libproc.c.auto.html
*
* It's just a thin wrapper around a syscall, so it's probably okay.
*/
{
char buffer[open_max * PROC_PIDLISTFD_SIZE];
ssize_t buffer_size;
buffer_size = proc_pidinfo (getpid (), PROC_PIDLISTFDS, 0, buffer, sizeof (buffer));
if (buffer_size > 0 &&
sizeof (buffer) >= (size_t) buffer_size &&
(buffer_size % PROC_PIDLISTFD_SIZE) == 0)
{
const struct proc_fdinfo *fd_info = (const struct proc_fdinfo *) buffer;
size_t number_of_fds = (size_t) buffer_size / PROC_PIDLISTFD_SIZE;
for (size_t i = 0; i < number_of_fds; i++)
if ((res = cb (data, fd_info[i].proc_fd)) != 0)
break;
return res;
}
}
#endif
for (fd = 0; fd < open_max; fd++)
if ((res = cb (data, fd)) != 0)
break;