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linux: Add close_range

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It was added on Linux 5.9 (278a5fbaed89) with CLOSE_RANGE_CLOEXEC
added on 5.11 (582f1fb6b721f).  Although FreeBSD has added the same
syscall, this only adds the symbol on Linux ports.  This syscall is
required to provided a fail-safe way to implement the closefrom
symbol (BZ #10353).

Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15.
This commit is contained in:
Adhemerval Zanella
2021-03-10 12:26:31 -03:00
parent ae8c243d24
commit 286286283e
40 changed files with 422 additions and 1 deletions
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23
sysdeps/unix/sysv/linux/bits/unistd_ext.h
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@ -33,4 +33,27 @@
not detached and has not been joined. */
extern __pid_t gettid (void) __THROW;
#ifdef __has_include
# if __has_include ("linux/close_range.h")
# include "linux/close_range.h"
# endif
#endif
/* Unshare the file descriptor table before closing file descriptors. */
#ifndef CLOSE_RANGE_UNSHARE
# define CLOSE_RANGE_UNSHARE (1U << 1)
#endif
/* Set the FD_CLOEXEC bit instead of closing the file descriptor. */
#ifndef CLOSE_RANGE_CLOEXEC
# define CLOSE_RANGE_CLOEXEC (1U << 2)
#endif
/* Close all file descriptors in the range FD up to MAX_FD. The flag FLAGS
are define by the CLOSE_RANGE prefix. This function behaves like close
on the range, but in a fail-safe where it will either fail and not close
any file descriptor or close all of them. Gaps where the file descriptor
is invalid are ignored. Returns 0 on successor or -1 for failure (and
sets errno accordingly). */
extern int close_range (unsigned int __fd, unsigned int __max_fd,
int __flags) __THROW;
#endif /* __USE_GNU */