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posix: Use posix_spawn on system

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This patch uses posix_spawn on system implementation.  On Linux this has
the advantage of much lower memory consumption (usually 32 Kb minimum for
the mmap stack area).

Although POSIX does not require, glibc system implementation aims to be
thread and cancellation safe.  The cancellation code is moved to generic
implementation and enabled iff SIGCANCEL is defined (similar on how the
cancellation handler is enabled on nptl-init.c).

Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
arm-linux-gnueabihf, and powerpc64le-linux-gnu.

	* sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Use
	__sigismember instead of sigismember.
	* sysdeps/posix/system.c [SIGCANCEL] (cancel_handler_args,
	cancel_handler): New definitions.
	(CLEANUP_HANDLER, CLEANUP_RESET): Likewise.
	(DO_LOCK, DO_UNLOCK, INIT_LOCK, ADD_REF, SUB_REF): Remove.
	(do_system): Use posix_spawn instead of fork and execl and remove
	reentracy code.
	* sysdeps/generic/not-errno.h (__kill_noerrno): New prototype.
	* sysdeps/unix/sysv/linux/not-errno.h (__kill_noerrno): Likewise.
	* sysdeps/unix/sysv/linux/ia64/system.c: Remove file.
	* sysdeps/unix/sysv/linux/s390/system.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/system.c: Likewise.
	* sysdeps/unix/sysv/linux/system.c: Likewise.
This commit is contained in:
Adhemerval Zanella
2018-10-24 16:29:38 -03:00
parent 14d0e87d9b
commit 5fb7fc9635
9 changed files with 131 additions and 255 deletions
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29
sysdeps/unix/sysv/linux/sparc/system.c
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/* Copyright (C) 2003-2018 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
<http://www.gnu.org/licenses/>. */
/* We have to and actually can handle cancelable system(). The big
problem: we have to kill the child process if necessary. To do
this a cleanup handler has to be registered and is has to be able
to find the PID of the child. The main problem is to reliable have
the PID when needed. It is not necessary for the parent thread to
return. It might still be in the kernel when the cancellation
request comes. Therefore we have to use the clone() calls ability
to have the kernel write the PID into the user-level variable. */
#define FORK() \
INLINE_CLONE_SYSCALL (CLONE_PARENT_SETTID | SIGCHLD, 0, &pid, NULL, NULL)
#include "../system.c"