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Adhemerval Zanella 607449506f io: Add closefrom [BZ #10353] 
The function closes all open file descriptors greater than or equal to
input argument.  Negative values are clamped to 0, i.e, it will close
all file descriptors.

As indicated by the bug report, this is a common symbol provided by
different systems (Solaris, OpenBSD, NetBSD, FreeBSD) and, although
its has inherent issues with not taking in consideration internal libc
file descriptors (such as syslog), this is also a common feature used
in multiple projects [1][2][3][4][5].

The Linux fallback implementation iterates over /proc and close all
file descriptors sequentially.  Although it was raised the questioning
whether getdents on /proc/self/fd might return disjointed entries
when file descriptor are closed; it does not seems the case on my
testing on multiple kernel (v4.18, v5.4, v5.9) and the same strategy
is used on different projects [1][2][3][5].

Also, the interface is set a fail-safe meaning that a failure in the
fallback results in a process abort.

Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15.

[1] 5238e95759/src/basic/fd-util.c (L217)
[2] ddf4b77e11/src/lxc/start.c (L236)
[3] 9e4f2f3a6b/Modules/_posixsubprocess.c (L220)
[4] 5f47c0613e/src/libstd/sys/unix/process2.rs (L303-L308)
[5] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
2021-07-08 14:08:14 -03:00
..
bits Annotate additional APIs with GCC attribute access. 2021-05-06 11:01:05 -06:00
sys y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
access.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug-ftw1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug-ftw2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug-ftw3.c
bug-ftw4.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug-ftw5.c
chdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chown.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
close.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
closefrom.c io: Add closefrom [BZ #10353] 2021-07-08 14:08:14 -03:00
copy_file_range.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
creat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
creat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dup2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dup3.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dup.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
euidaccess.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
faccessat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchmodat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchown.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchownat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fcntl64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fcntl.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fcntl.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
file_change_detection.c hurd: Fix build after 52a5fe70a2 2021-06-23 14:14:48 -03:00
flock.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstat64.c io: Return EBAFD for negative file descriptor on fstat (BZ #27559) 2021-03-11 10:51:55 -03:00
fstat.c io: Return EBAFD for negative file descriptor on fstat (BZ #27559) 2021-03-11 10:51:55 -03:00
fstatat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatvfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatvfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fts64-time64.c io: Add fts64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
fts64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fts.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fts.h io: Add fts64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
ftw64-time64.c io: Add ftw64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
ftw64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ftw.c io: Add ftw64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
ftw.h io: Add ftw64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
ftwtest-sh io: Use temporary directory and file for ftwtest-sh 2021-04-15 09:39:53 -03:00
ftwtest-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
ftwtest.c
futimens.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getcwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getdirname.c Use 64 bit time_t stat internally 2021-06-22 12:09:52 -03:00
getwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
isatty.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lchmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lchown.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
link.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
linkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lockf64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lockf.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lseek64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lseek.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lstat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lstat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Makefile io: Add closefrom [BZ #10353] 2021-07-08 14:08:14 -03:00
mkdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mkdirat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mkfifo.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mkfifoat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mknod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mknodat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open64_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat64_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pipe2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pipe.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
poll.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
poll.h
posix_fadvise64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
posix_fadvise.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
posix_fallocate64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
posix_fallocate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ppoll.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
read.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
readlink.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
readlinkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
rmdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sendfile64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sendfile.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statvfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statvfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statx_generic.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statx.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
symlink.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
symlinkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
test-lfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
test-stat2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
test-stat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
test-utime.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-closefrom.c io: Add closefrom [BZ #10353] 2021-07-08 14:08:14 -03:00
tst-copy_file_range.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-faccessat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-fchmodat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-fchownat.c Revert "hurd: Fix building io/tst-fchownat.c" 2018-01-28 19:13:20 +01:00
tst-fcntl.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-file_change_detection.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-fstatat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-fts-lfs.c Add LFS support for fts functions (bug 11460) 2015-11-06 11:24:16 +01:00
tst-fts-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-fts.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ftw-bz26353.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ftw-lnk.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-futimens-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimens.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimes-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimes.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimesat-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimesat.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-getcwd-abspath.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-getcwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-lchmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-linkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-lockf.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-lutimes-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-lutimes.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-mkdirat.c Assume that _DIRENT_HAVE_D_TYPE is always defined. 2017-10-30 15:48:33 +01:00
tst-mkfifoat.c Assume that _DIRENT_HAVE_D_TYPE is always defined. 2017-10-30 15:48:33 +01:00
tst-mknodat.c Assume that _DIRENT_HAVE_D_TYPE is always defined. 2017-10-30 15:48:33 +01:00
tst-open-tmpfile.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-openat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-posix_fallocate64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-posix_fallocate-common.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-posix_fallocate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-readlinkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-renameat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-stat-lfs.c io: Return EBAFD for negative file descriptor on fstat (BZ #27559) 2021-03-11 10:51:55 -03:00
tst-stat-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-stat.c io: Fix sporadic test failures in io/tst-stat 2021-06-10 13:48:26 +02:00
tst-statvfs.c
tst-statx.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-symlinkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-ttyname_r.c
tst-unlinkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-utime-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utime.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimensat-skeleton.c linux: Add lutimes test 2021-04-15 09:39:49 -03:00
tst-utimensat-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimensat.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimes-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimes.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
ttyname_r.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ttyname.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
umask.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unlink.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unlinkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
utime.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
utime.h y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
utimensat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Versions io: Add closefrom [BZ #10353] 2021-07-08 14:08:14 -03:00
write.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00