glibc/sysdeps/unix/sysv/linux/i386
Adhemerval Zanella 882d6e17bc posix: Add posix_spawn_file_actions_addclosefrom_np
This patch adds a way to close a range of file descriptors on
posix_spawn as a new file action.  The API is similar to the one
provided by Solaris 11 [1], where the file action causes the all open
file descriptors greater than or equal to input on to be closed when
the new process is spawned.

The function posix_spawn_file_actions_addclosefrom_np is safe to be
implemented by iterating over /proc/self/fd, since the Linux spawni.c
helper process does not use CLONE_FILES, so its has own file descriptor
table and any failure (in /proc operation) aborts the process creation
and returns an error to the caller.

I am aware that this file action might be redundant to the current
approach of POSIX in promoting O_CLOEXEC in more interfaces. However
O_CLOEXEC is still not the default and for some specific usages, the
caller needs to close all possible file descriptors to avoid them
leaking.  Some examples are CPython (discussed in BZ#10353) and OpenJDK
jspawnhelper [2] (where OpenJDK spawns a helper process to exactly
closes all file descriptors).  Most likely any environment which calls
functions that might open file descriptor under the hood and aim to use
posix_spawn might face the same requirement.

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

[1] https://docs.oracle.com/cd/E36784_01/html/E36874/posix-spawn-file-actions-addclosefrom-np-3c.html
[2] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
2021-07-08 14:08:15 -03:00
..
i686 Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
i786
____longjmp_chk.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
arch-syscall.h Update syscall lists for Linux 5.13 2021-07-01 17:37:36 +00:00
brk.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
c++-types.data
clone.S i386/clone.S: Remove redundant EBX load 2021-02-22 04:29:19 -08:00
configure Require Linux kernel 3.2 or later on x86 / x86_64. 2017-05-08 10:45:20 +00:00
configure.ac Require Linux kernel 3.2 or later on x86 / x86_64. 2017-05-08 10:45:20 +00:00
dl-librecon.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-procinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getcontext.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Implies
jmp_buf-macros.h Add jmp_buf-macros.h 2017-11-09 05:10:03 -08:00
kernel_stat.h linux: Set default kernel_stat.h to LFS 2021-02-11 07:58:05 -03:00
kernel-features.h linux: Consolidate Linux setsockopt implementation 2021-07-06 11:45:35 -03:00
ld.abilist <sys/platform/x86.h>: Remove the C preprocessor magic 2021-01-21 05:58:17 -08:00
ldconfig.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libanl.abilist resolv: Move libanl into libc (if libpthread is in libc) 2021-07-02 11:45:00 +02:00
libBrokenLocale.abilist Ignore absolute symbols in ABI tests. 2018-05-04 15:46:32 +00:00
libc_sigaction.c signal: Add __libc_sigaction 2021-03-18 15:54:39 -03:00
libc-do-syscall.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc.abilist posix: Add posix_spawn_file_actions_addclosefrom_np 2021-07-08 14:08:15 -03:00
libcrypt.abilist Ignore absolute symbols in ABI tests. 2018-05-04 15:46:32 +00:00
libdl.abilist dlfcn: Move dlopen into libc 2021-06-03 08:26:04 +02:00
libm.abilist Move __isnanf128 to libc.so 2021-03-30 14:58:19 +05:30
libnsl.abilist Ignore absolute symbols in ABI tests. 2018-05-04 15:46:32 +00:00
libpthread.abilist nptl: Remove remaining code from libpthread 2021-05-21 22:35:01 +02:00
libresolv.abilist Ignore absolute symbols in ABI tests. 2018-05-04 15:46:32 +00:00
librt.abilist Linux: Move timer_settime, __timer_settime64 from librt to libc 2021-06-28 09:51:01 +02:00
libthread_db.abilist Ignore absolute symbols in ABI tests. 2018-05-04 15:46:32 +00:00
libutil.abilist login: Move libutil into libc 2021-06-30 08:43:37 +02:00
localplt.data ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486] 2020-02-15 11:01:23 +01:00
makecontext.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Makefile Linux: Remove remaining references to $(shared-thread-library) 2021-05-25 11:30:23 +02:00
register-dump.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
setcontext.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
shlib-versions Clean up gnu/lib-names.h generation (bug 14171). 2014-09-26 17:33:04 +00:00
sigcontextinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
startup.h Use <startup.h> in __libc_init_secure 2021-01-19 09:55:47 -08:00
struct_kernel_msqid64_ds.h sysv: linux: Add 64-bit time_t variant for msgctl 2020-07-09 12:05:40 -03:00
struct_kernel_semid64_ds.h sysv: linux: Add 64-bit time_t variant for semctl 2020-07-09 12:05:35 -03:00
struct_kernel_shmid64_ds.h sysv: linux: Add 64-bit time_t variant for shmctl 2020-07-09 12:05:47 -03:00
swapcontext.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
syscall.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
syscalls.list posix: Consolidate Linux waitpid syscall 2017-05-18 18:06:47 -03:00
sysdep.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sysdep.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
time64-compat.h y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
tst-bz21269.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ucontext_i.sym i386: Enable CET support in ucontext functions 2020-02-14 15:15:25 -08:00
Versions Add missing symbols to Version files 2021-06-02 07:32:19 +02:00
vfork.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00