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gspawn: Use close_range() if available to close FDs between fork/exec

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It’s landed in kernel 5.9: http://lkml.iu.edu/hypermail/linux/kernel/2008.0/02649.html

Note, this is untested because I currently don’t have kernel 5.9. We can
fix anything up if it breaks once the new syscall is wrapped in glibc.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
This commit is contained in:
Philip Withnall 2020-10-12 18:10:45 +01:00
parent 8cefc0ae1e
commit 9f8ccee65f
2 changed files with 6 additions and 0 deletions
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5
glib/gspawn.c
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@ -1327,6 +1327,11 @@ safe_closefrom (int lowfd)
* simple wrapper of the fcntl command. * simple wrapper of the fcntl command.
*/ */
(void) fcntl (lowfd, F_CLOSEM); (void) fcntl (lowfd, F_CLOSEM);
#elif defined(HAVE_CLOSE_RANGE)
/* close_range() is available in Linux since kernel 5.9, and on FreeBSD at
* around the same time. It was designed for use in async-signal-safe
* situations: https://bugs.python.org/issue38061 */
(void) close_range (lowfd, G_MAXUINT);
#else #else
(void) safe_fdwalk (close_func, GINT_TO_POINTER (lowfd)); (void) safe_fdwalk (close_func, GINT_TO_POINTER (lowfd));
#endif #endif

1
meson.build
View File

@ -473,6 +473,7 @@ if host_system == 'windows'
endif endif
functions = [ functions = [
'close_range',
'endmntent', 'endmntent',
'endservent', 'endservent',
'fallocate', 'fallocate',