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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
NEWS
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@ -60,6 +60,9 @@ Major new features:
to call async-signal-safe functions (such as raise or execve). This function
is currently a GNU extension.
* On Linux, the close_range function has been added. It allows efficiently
closing a range of file descriptors on recent kernels (version 5.9).
Deprecated and removed features, and other changes affecting compatibility:
* The function pthread_mutex_consistent_np has been deprecated; programs

6
include/bits/unistd_ext.h Normal file
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@ -0,0 +1,6 @@
#include_next <bits/unistd_ext.h>
#ifndef _ISOMAC
extern int __close_range (unsigned int lowfd, unsigned int highfd, int flags);
libc_hidden_proto (__close_range);
#endif

51
manual/llio.texi
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@ -284,6 +284,57 @@ of trying to close its underlying file descriptor with @code{close}.
This flushes any buffered output and updates the stream object to
indicate that it is closed.
@deftypefun int close_range (unsigned int @var{lowfd}, unsigned int @var{maxfd}, int @var{flags})
@standards{Linux, unistd.h}
@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{@acsfd{}}}
@c This is a syscall for Linux v5.9. There is no fallback emulation for
@c older kernels.
The function @code{close_range} closes the file descriptor from @var{lowfd}
to @var{maxfd} (inclusive). This function is similar to call @code{close} in
specified file descriptor range depending on the @var{flags}.
This is function is only supported on recent Linux versions and @theglibc{}
does not provide any fallback (the application will need to handle possible
@code{ENOSYS}).
The @var{flags} add options on how the files are closes. Linux currently
supports:
@vtable @code
@item CLOSE_RANGE_UNSHARE
Unshare the file descriptor table before closing file descriptors.
@item CLOSE_RANGE_CLOEXEC
Set the @code{FD_CLOEXEC} bit instead of closing the file descriptor.
@end vtable
The normal return value from @code{close_range} is @math{0}; a value
of @math{-1} is returned in case of failure. The following @code{errno} error
conditions are defined for this function:
@table @code
@item EINVAL
The @var{lowfd} value is larger than @var{maxfd} or an unsupported @var{flags}
is used.
@item ENOMEM
Either there is not enough memory for the operation, or the process is
out of address space. It can only happnes when @code{CLOSE_RANGE_UNSHARED}
flag is used.
@item EMFILE
The process has too many files open and it can only happens when
@code{CLOSE_RANGE_UNSHARED} flag is used.
The maximum number of file descriptors is controlled by the
@code{RLIMIT_NOFILE} resource limit; @pxref{Limits on Resources}.
@item ENOSYS
The kernel does not implement the required functionality.
@end table
@end deftypefun
@node I/O Primitives
@section Input and Output Primitives

3
sysdeps/unix/sysv/linux/Makefile
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@ -116,7 +116,8 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \
tst-timerfd tst-ppoll \
tst-clock_adjtime tst-adjtimex tst-ntp_adjtime tst-ntp_gettime \
tst-ntp_gettimex tst-sigtimedwait tst-misalign-clone
tst-ntp_gettimex tst-sigtimedwait tst-misalign-clone \
tst-close_range
# Test for the symbol version of fcntl that was replaced in glibc 2.28.
ifeq ($(have-GLIBC_2.27)$(build-shared),yesyes)

1
sysdeps/unix/sysv/linux/Versions
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@ -283,6 +283,7 @@ libc {
__wait3_time64;
__wait4_time64;
%endif
close_range;
}
GLIBC_PRIVATE {
# functions used in other libraries

1
sysdeps/unix/sysv/linux/aarch64/libc.abilist
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@ -2407,6 +2407,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/alpha/libc.abilist
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@ -2506,6 +2506,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/arc/libc.abilist
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@ -2166,6 +2166,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/arm/be/libc.abilist
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@ -300,6 +300,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/arm/le/libc.abilist
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@ -297,6 +297,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

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 */

1
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -2432,6 +2432,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -2385,6 +2385,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/i386/libc.abilist
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@ -2569,6 +2569,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/ia64/libc.abilist
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@ -2344,6 +2344,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
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@ -301,6 +301,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
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@ -2512,6 +2512,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
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@ -2483,6 +2483,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -2480,6 +2480,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -2477,6 +2477,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
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@ -2475,6 +2475,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
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@ -2483,6 +2483,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
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@ -2395,6 +2395,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/nios2/libc.abilist
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@ -2522,6 +2522,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -2539,6 +2539,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
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@ -2572,6 +2572,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
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@ -2308,6 +2308,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
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@ -2603,6 +2603,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2168,6 +2168,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2368,6 +2368,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -2537,6 +2537,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
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@ -2345,6 +2345,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/sh/be/libc.abilist
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@ -2392,6 +2392,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/sh/le/libc.abilist
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@ -2389,6 +2389,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
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@ -2532,6 +2532,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
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@ -2367,6 +2367,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/syscalls.list
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@ -99,3 +99,4 @@ pkey_alloc EXTRA pkey_alloc i:ii pkey_alloc
pkey_free EXTRA pkey_free i:i pkey_free
gettid EXTRA gettid Ei: __gettid gettid
tgkill EXTRA tgkill i:iii __tgkill tgkill
close_range EXTRA close_range i:iii __close_range close_range

303
sysdeps/unix/sysv/linux/tst-close_range.c Normal file
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@ -0,0 +1,303 @@
/* Test for the close_range system call.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <getopt.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdint.h>
#include <array_length.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/descriptors.h>
#include <support/support.h>
#include <support/xsched.h>
#include <support/xunistd.h>
#define NFDS 100
static int
open_multiple_temp_files (void)
{
/* Check if the temporary file descriptor has no no gaps. */
int lowfd = xopen ("/dev/null", O_RDONLY, 0600);
for (int i = 1; i <= NFDS; i++)
TEST_COMPARE (xopen ("/dev/null", O_RDONLY, 0600),
lowfd + i);
return lowfd;
}
static void
close_range_test_max_upper_limit (void)
{
struct support_descriptors *descrs = support_descriptors_list ();
int lowfd = open_multiple_temp_files ();
{
int r = close_range (lowfd, ~0U, 0);
if (r == -1 && errno == ENOSYS)
FAIL_UNSUPPORTED ("close_range not supported");
TEST_COMPARE (r, 0);
}
support_descriptors_check (descrs);
support_descriptors_free (descrs);
}
static void
close_range_test_common (int lowfd, unsigned int flags)
{
const int maximum_fd = lowfd + NFDS;
const int half_fd = lowfd + NFDS / 2;
const int gap_1 = maximum_fd - 8;
/* Close half of the descriptors and check result. */
TEST_COMPARE (close_range (lowfd, half_fd, flags), 0);
for (int i = lowfd; i <= half_fd; i++)
{
TEST_COMPARE (fcntl (i, F_GETFL), -1);
TEST_COMPARE (errno, EBADF);
}
for (int i = half_fd + 1; i < maximum_fd; i++)
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
/* Create some gaps, close up to a threshold, and check result. */
xclose (lowfd + 57);
xclose (lowfd + 78);
xclose (lowfd + 81);
xclose (lowfd + 82);
xclose (lowfd + 84);
xclose (lowfd + 90);
TEST_COMPARE (close_range (half_fd + 1, gap_1, flags), 0);
for (int i = half_fd + 1; i < gap_1; i++)
{
TEST_COMPARE (fcntl (i, F_GETFL), -1);
TEST_COMPARE (errno, EBADF);
}
for (int i = gap_1 + 1; i < maximum_fd; i++)
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
/* Close the remaining but the last one. */
TEST_COMPARE (close_range (gap_1 + 1, maximum_fd - 1, flags), 0);
for (int i = gap_1 + 1; i < maximum_fd - 1; i++)
{
TEST_COMPARE (fcntl (i, F_GETFL), -1);
TEST_COMPARE (errno, EBADF);
}
TEST_VERIFY (fcntl (maximum_fd, F_GETFL) > -1);
/* Close the last one. */
TEST_COMPARE (close_range (maximum_fd, maximum_fd, flags), 0);
TEST_COMPARE (fcntl (maximum_fd, F_GETFL), -1);
TEST_COMPARE (errno, EBADF);
}
/* Basic tests: check if the syscall close ranges with and without gaps. */
static void
close_range_test (void)
{
struct support_descriptors *descrs = support_descriptors_list ();
/* Check if the temporary file descriptor has no no gaps. */
int lowfd = open_multiple_temp_files ();
close_range_test_common (lowfd, 0);
/* Double check by check the /proc. */
support_descriptors_check (descrs);
support_descriptors_free (descrs);
}
_Noreturn static int
close_range_test_fn (void *arg)
{
int lowfd = (int) ((uintptr_t) arg);
close_range_test_common (lowfd, 0);
exit (EXIT_SUCCESS);
}
/* Check if a clone_range on a subprocess created with CLONE_FILES close
the shared file descriptor table entries in the parent. */
static void
close_range_test_subprocess (void)
{
struct support_descriptors *descrs = support_descriptors_list ();
/* Check if the temporary file descriptor has no no gaps. */
int lowfd = open_multiple_temp_files ();
struct support_stack stack = support_stack_alloc (4096);
pid_t pid = xclone (close_range_test_fn, (void*) (uintptr_t) lowfd,
stack.stack, stack.size, CLONE_FILES | SIGCHLD);
TEST_VERIFY_EXIT (pid > 0);
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (WIFEXITED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
support_stack_free (&stack);
for (int i = lowfd; i < NFDS; i++)
TEST_VERIFY (fcntl (i, F_GETFL) < 0);
support_descriptors_check (descrs);
support_descriptors_free (descrs);
}
_Noreturn static int
close_range_unshare_test_fn (void *arg)
{
int lowfd = (int) ((uintptr_t) arg);
close_range_test_common (lowfd, CLOSE_RANGE_UNSHARE);
exit (EXIT_SUCCESS);
}
/* Check if a close_range with CLOSE_RANGE_UNSHARE issued from a subprocess
created with CLONE_FILES does not close the parent file descriptor list. */
static void
close_range_unshare_test (void)
{
struct support_descriptors *descrs1 = support_descriptors_list ();
/* Check if the temporary file descriptor has no no gaps. */
int lowfd = open_multiple_temp_files ();
struct support_descriptors *descrs2 = support_descriptors_list ();
struct support_stack stack = support_stack_alloc (4096);
pid_t pid = xclone (close_range_unshare_test_fn, (void*) (uintptr_t) lowfd,
stack.stack, stack.size, CLONE_FILES | SIGCHLD);
TEST_VERIFY_EXIT (pid > 0);
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (WIFEXITED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
support_stack_free (&stack);
for (int i = 0; i < NFDS; i++)
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
support_descriptors_check (descrs2);
support_descriptors_free (descrs2);
TEST_COMPARE (close_range (lowfd, lowfd + NFDS, 0), 0);
support_descriptors_check (descrs1);
support_descriptors_free (descrs1);
}
static bool
is_in_array (int *arr, size_t len, int fd)
{
bool r = false;
for (int i = 0; i < len; i++)
if (arr[i] == fd)
return true;
return r;
}
static void
close_range_cloexec_test (void)
{
/* Check if the temporary file descriptor has no no gaps. */
const int lowfd = open_multiple_temp_files ();
const int maximum_fd = lowfd + NFDS;
const int half_fd = lowfd + NFDS / 2;
const int gap_1 = maximum_fd - 8;
/* Close half of the descriptors and check result. */
int r = close_range (lowfd, half_fd, CLOSE_RANGE_CLOEXEC);
if (r == -1 && errno == EINVAL)
{
printf ("%s: CLOSE_RANGE_CLOEXEC not supported\n", __func__);
return;
}
for (int i = lowfd; i <= half_fd; i++)
{
int flags = fcntl (i, F_GETFD);
TEST_VERIFY (flags > -1);
TEST_COMPARE (flags & FD_CLOEXEC, FD_CLOEXEC);
}
for (int i = half_fd + 1; i < maximum_fd; i++)
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
/* Create some gaps, close up to a threshold, and check result. */
static int gap_close[] = { 57, 78, 81, 82, 84, 90 };
for (int i = 0; i < array_length (gap_close); i++)
xclose (gap_close[i]);
TEST_COMPARE (close_range (half_fd + 1, gap_1, CLOSE_RANGE_CLOEXEC), 0);
for (int i = half_fd + 1; i < gap_1; i++)
{
int flags = fcntl (i, F_GETFD);
if (is_in_array (gap_close, array_length (gap_close), i))
TEST_COMPARE (flags, -1);
else
{
TEST_VERIFY (flags > -1);
TEST_COMPARE (flags & FD_CLOEXEC, FD_CLOEXEC);
}
}
for (int i = gap_1 + 1; i < maximum_fd; i++)
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
/* Close the remaining but the last one. */
TEST_COMPARE (close_range (gap_1 + 1, maximum_fd - 1, CLOSE_RANGE_CLOEXEC),
0);
for (int i = gap_1 + 1; i < maximum_fd - 1; i++)
{
int flags = fcntl (i, F_GETFD);
TEST_VERIFY (flags > -1);
TEST_COMPARE (flags & FD_CLOEXEC, FD_CLOEXEC);
}
TEST_VERIFY (fcntl (maximum_fd, F_GETFL) > -1);
/* Close the last one. */
TEST_COMPARE (close_range (maximum_fd, maximum_fd, CLOSE_RANGE_CLOEXEC), 0);
{
int flags = fcntl (maximum_fd, F_GETFD);
TEST_VERIFY (flags > -1);
TEST_COMPARE (flags & FD_CLOEXEC, FD_CLOEXEC);
}
}
static int
do_test (void)
{
close_range_test_max_upper_limit ();
close_range_test ();
close_range_test_subprocess ();
close_range_unshare_test ();
close_range_cloexec_test ();
return 0;
}
#include <support/test-driver.c>

1
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
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@ -2323,6 +2323,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F

1
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
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@ -2422,6 +2422,7 @@ GLIBC_2.34 aio_suspend64 F
GLIBC_2.34 aio_write F
GLIBC_2.34 aio_write64 F
GLIBC_2.34 call_once F
GLIBC_2.34 close_range F
GLIBC_2.34 cnd_broadcast F
GLIBC_2.34 cnd_destroy F
GLIBC_2.34 cnd_init F