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closefrom: Use close_range() on Linux when available

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Closes: !11
Based-on-patch-by: cptpcrd <cptpcrd.git@gmail.com>
Signed-off-by: Guillem Jover <guillem@hadrons.org>
This commit is contained in:
Guillem Jover 2021-02-08 03:45:06 +01:00
parent c4fca5bb4f
commit e832b7687e
1 changed files with 20 additions and 1 deletions
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21
src/closefrom.c
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@ -19,6 +19,12 @@
#include <config.h>
#ifdef __linux__
# include <sys/syscall.h>
# if defined(__NR_close_range) && !defined(SYS_close_range)
# define SYS_close_range __NR_close_range
# endif
#endif
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
@ -61,6 +67,14 @@ closefrom_close(int fd)
#endif
}
#if defined(__linux__) && defined(SYS_close_range)
static inline int
sys_close_range(unsigned int fd, unsigned int max_fd, unsigned int flags)
{
return syscall(SYS_close_range, fd, max_fd, flags);
}
#endif
/*
* Close all file descriptors greater than or equal to lowfd.
* This is the expensive (fallback) method.
@ -182,11 +196,16 @@ closefrom(int lowfd)
if (lowfd < 0)
lowfd = 0;
/* Try the fast method first, if possible. */
/* Try the fast methods first, if possible. */
#if defined(HAVE_FCNTL_CLOSEM)
if (fcntl(lowfd, F_CLOSEM, 0) != -1)
return;
#endif /* HAVE_FCNTL_CLOSEM */
#if defined(__linux__) && defined(SYS_close_range)
if (sys_close_range(lowfd, UINT_MAX, 0) == 0)
return;
#endif
#if defined(HAVE_PSTAT_GETPROC)
if (closefrom_pstat(lowfd) != -1)
return;