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	Commit message (Collapse)	Author	Age	Files	Lines
*	posix: New Linux posix_spawn{p} implementation	Adhemerval Zanella	2016-03-07	1	-0/+1
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	This patch implements a new posix_spawn{p} implementation for Linux. The main difference is it uses the clone syscall directly with CLONE_VM and CLONE_VFORK flags and a direct allocated stack. The new stack and start function solves most the vfork limitation (possible parent clobber due stack spilling). The remaning issue are related to signal handling: 1. That no signal handlers must run in child context, to avoid corrupt parent's state. 2. Child must synchronize with parent to enforce stack deallocation and to possible return execv issues. The first one is solved by blocking all signals in child, even NPTL-internal ones (SIGCANCEL and SIGSETXID). The second issue is done by a stack allocation in parent and a synchronization with using a pipe or waitpid (in case or error). The pipe has the advantage of allowing the child signal an exec error (checked with new tst-spawn2 test). There is an inherent race condition in pipe2 usage for architectures that do not support the syscall directly. In such cases the a pipe plus fctnl is used instead and it may lead to file descriptor leak in parent (as decribed by fcntl documentation). The child process stack is allocate with a mmap with MAP_STACK flag using default architecture stack size. Although it is slower than use a stack buffer from parent, it allows some slack for the compatibility code to run scripts with no shebang (which may use a buffer with size depending of argument list count). Performance should be similar to the vfork default posix implementation and way faster than fork path (vfork on mostly linux ports are basically clone with CLONE_VM plus CLONE_VFORK). The only difference is the syscalls required for the stack allocation/deallocation. It fixes BZ#10354, BZ#14750, and BZ#18433. Tested on i386, x86_64, powerpc64le, and aarch64. [BZ #14750] [BZ #10354] [BZ #18433] * include/sched.h (__clone): Add hidden prototype. (__clone2): Likewise. * include/unistd.h (__dup): Likewise. * posix/Makefile (tests): Add tst-spawn2. * posix/tst-spawn2.c: New file. * sysdeps/posix/dup.c (__dup): Add hidden definition. * sysdeps/unix/sysv/linux/aarch64/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/alpha/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/arm/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/hppa/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/i386/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/ia64/clone2.S (__clone): Likewise. * sysdeps/unix/sysv/linux/m68k/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/microblaze/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/mips/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/nios2/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/sh/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/tile/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/x86_64/clone.S (__clone): Likewise. * sysdeps/unix/sysv/linux/nptl-signals.h (____nptl_is_internal_signal): New function. * sysdeps/unix/sysv/linux/spawni.c: New file.
*	Update copyright dates with scripts/update-copyrights.	Joseph Myers	2016-01-04	1	-1/+1
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*	Update copyright dates with scripts/update-copyrights.	Joseph Myers	2015-01-02	1	-1/+1
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*	SH: Consolidate NPTL/non versions of clone	Roland McGrath	2014-05-28	1	-6/+1
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*	Update copyright notices with scripts/update-copyrights	Allan McRae	2014-01-01	1	-1/+1
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*	Remove trailing whitespace.	Joseph Myers	2013-06-05	1	-3/+3
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*	Update copyright notices with scripts/update-copyrights.	Joseph Myers	2013-01-02	1	-1/+1
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*	Replace FSF snail mail address with URLs.	Paul Eggert	2012-02-09	1	-3/+2
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*	* sysdeps/sh/bsd-setjmp.S (setjmp): Use correct argument registers.	Roland McGrath	2007-07-15	1	-5/+5
\| \| \| \| \| \|	* sysdeps/sh/bsd-_setjmp.S (_setjmp): Likewise. * sysdeps/unix/sysv/linux/sh/clone.S (__clone): Do correct sanity check for the first argument.
*	Update.	Ulrich Drepper	2004-12-07	1	-3/+36
\| \| \| \| \| \| \| \|	2004-12-07 Kaz Kojima <kkojima@rr.iij4u.or.jp> * sysdeps/unix/sysv/linux/sh/clone.S: Clear the frame pointer when starting a new thread. Add support for NPTL where the PID is stored at userlevel and needs to be reset when CLONE_THREAD is not used.
*	Update.	Ulrich Drepper	2003-02-08	1	-2/+6
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	2003-02-07 Kaz Kojima <kkojima@rr.iij4u.or.jp> * elf/tls-macros.h: Add non-PIC TLS macros and fix clobber list for SH. * sysdeps/unix/sysv/linux/sh/brk.c: Add SYSCALL_INST_PAD after the trapa instruction. * sysdeps/unix/sysv/linux/sh/clone.S (__clone): Add additional parameters. * sysdeps/unix/sysv/linux/sh/sh4/sysdep.h: New file. (NEED_SYSCALL_INST_PAD): Define. * sysdeps/unix/sysv/linux/sh/sys/user.h (start_thread): Undef to avoid to use definition for the kernel. * sysdeps/unix/sysv/linux/sh/sysdep.h (SYSCALL_ERROR_HANDLER): Save and restore the frame pointer. (SYSCALL_INST_PAD): Define. (INLINE_SYSCALL): Make use of INTERNAL_SYSCALL. (INTERNAL_SYSCALL): Make use of ERR parameter. Add SYSCALL_INST_PAD after trapa instruction. (INTERNAL_SYSCALL_DECL, INTERNAL_SYSCALL_ERRNO, INTERNAL_SYSCALL_ERROR_P): Adjust accordingly.
*	Update.	Ulrich Drepper	2003-01-05	1	-49/+11
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	2003-01-05 Kaz Kojima <kkojima@rr.iij4u.or.jp> * sysdeps/unix/sysv/linux/sh/clone.S (__clone): Use SYSCALL_ERROR_HANDLER. * sysdeps/unix/sysv/linux/sh/pipe.S (__libc_pipe): Likewise. * sysdeps/unix/sysv/linux/sh/socket.S (__socket): Likewise. Add support for cancellation handling. * sysdeps/unix/sysv/linux/sh/syscall.S (__syscall): Use SYSCALL_ERROR_HANDLER. * sysdeps/unix/sysv/linux/sh/vfork.S (__vfork): Likewise. * sysdeps/unix/sysv/linux/sh/sysdep.h (PSEUDO): Likewise. Add support for cancellation handling. (SYSCALL_ERROR_HANDLER): Define PIC variants.
*	Update to LGPL v2.1.	Andreas Jaeger	2001-07-06	1	-8/+8
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
*	Update.	Ulrich Drepper	2000-10-26	1	-2/+2
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	2000-10-26 Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Yutaka Niibe <gniibe@chroot.org> * sysdeps/sh/dl-machine.h (elf_machine_rela): Handle in place relocation which is generated by new ld. * sysdeps/sh/elf/initfini.c (_init): Preseted __fpscr_values. (_fini): Delete an obsolete register prefix. * sysdeps/unix/sysv/linux/sh/Versions: Add __xstat64, __fxstat64, __lxstat64, alphasort64, glob64, readdir64, readdir64_r, scandir64 and versionsort64 as the 2.2-versioned symbols. * sysdeps/unix/sysv/linux/sh/bits/fcntl.h: New file. * sysdeps/unix/sysv/linux/sh/brk.c: Changes for the new system call calling convention of the kernel. * sysdeps/unix/sysv/linux/sh/pipe.S: Likewise. * sysdeps/unix/sysv/linux/sh/socket.S: Likewise. * sysdeps/unix/sysv/linux/sh/clone.S: Likewise. * sysdeps/unix/sysv/linux/sh/vfork.S: Likewise. * sysdeps/unix/sysv/linux/sh/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/sh/fcntl.c: New file. * sysdeps/unix/sysv/linux/sh/lockf64.c: New file. * sysdeps/unix/sysv/linux/sh/sys/user.h: Include the kernel header file and delete the definitions of struct user and user_fp. * sysdeps/unix/sysv/linux/sh/syscall.S: New file. * sysdeps/unix/sysv/linux/sh/syscalls.list: Remove entries for s_ioctl, s_ipc, s_llseek, s_chown, s_fchown, s_lchown, s_execve, rt_sigaction, rt_sigpending, rt_sigprocmask, rt_sigqueueinfo, rt_sigsuspend, rt_sigtimedwait, s_getcwd, s_getdents, s_getgroups, s_getpriority, s_getegid, s_geteuid, s_getuid, getresgid, getresuid, s_getrlimit, s_poll, s_pread64, s_ptrace, s_pwrite64, s_reboot, s_setrlimit, s_sigaction, s_sigpending, s_sigprocmask, s_sigsuspend, s_setfsgid, s_setfsuid, s_setgid, s_setgroups, s_setregid, s_setresgid, s_setresuid, s_setreuid, s_setuid, s_sysctl, s_ugetrlimit, s_ustat, sys_fstat, sys_lstat, sys_mknod, sys_readv, sys_stat, sys_writev and syscall.
*	Update.	Ulrich Drepper	2000-06-12	1	-0/+133
	2000-06-12 Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Yutaka Niibe <gniibe@chroot.org> * sysdeps/sh/Dist: New file. * sysdeps/sh/Implies: New file. * sysdeps/sh/gmp-mparam.h: New file. * sysdeps/sh/init-first.c: New file. * sysdeps/sh/machine-gmon.h: New file. * sysdeps/sh/memcpy.S: New file. * sysdeps/sh/memprof.h: New file. * sysdeps/sh/memset.S: New file. * sysdeps/sh/sh3/__longjmp.S: New file. * sysdeps/sh/sh3/bits/endian.h: New file. * sysdeps/sh/sh3/bits/huge_val.h: New file. * sysdeps/sh/sh3/bits/setjmp.h: New file. * sysdeps/sh/sh3/bsd-_setjmp.S: New file. * sysdeps/sh/sh3/bsd-setjmp.S: New file. * sysdeps/sh/sh3/dl-machine.h: New file. * sysdeps/sh/sh3/elf/initfini.c: New file. * sysdeps/sh/sh3/elf/start.S: New file. * sysdeps/sh/sh3/setjmp.S: New file. * sysdeps/sh/sh3/sys/ucontext.h: New file. * sysdeps/sh/sh4/__longjmp.S: New file. * sysdeps/sh/sh4/bits/endian.h: New file. * sysdeps/sh/sh4/bits/huge_val.h: New file. * sysdeps/sh/sh4/bits/setjmp.h: New file. * sysdeps/sh/sh4/bsd-_setjmp.S: New file. * sysdeps/sh/sh4/bsd-setjmp.S: New file. * sysdeps/sh/sh4/dl-machine.h: New file. * sysdeps/sh/sh4/elf/initfini.c: New file. * sysdeps/sh/sh4/elf/start.S: New file. * sysdeps/sh/sh4/fpu/bits/fenv.h: New file. * sysdeps/sh/sh4/fpu/bits/huge_val.h: New file. * sysdeps/sh/sh4/fpu/bits/mathdef.h: New file. * sysdeps/sh/sh4/fpu/fclrexcpt.c: New file. * sysdeps/sh/sh4/fpu/fegetenv.c: New file. * sysdeps/sh/sh4/fpu/fegetround.c: New file. * sysdeps/sh/sh4/fpu/feholdexcpt.c: New file. * sysdeps/sh/sh4/fpu/fesetenv.c: New file. * sysdeps/sh/sh4/fpu/fesetround.c: New file. * sysdeps/sh/sh4/fpu/fpu_control.h: New file. * sysdeps/sh/sh4/fpu/fraiseexcpt.c: New file. * sysdeps/sh/sh4/fpu/fsetexcptflg.c: New file. * sysdeps/sh/sh4/fpu/ftestexcept.c: New file. * sysdeps/sh/sh4/fpu/libm-test-ulps: New file. * sysdeps/sh/sh4/setjmp.S: New file. * sysdeps/sh/sh4/sys/ucontext.h: New file. * sysdeps/sh/strlen.S: New file. * sysdeps/sh/sysdep.h: New file. * sysdeps/unix/sh/sysdep.S: New file. * sysdeps/unix/sh/sysdep.h: New file. * sysdeps/unix/sysv/linux/sh/Dist: New file. * sysdeps/unix/sysv/linux/sh/Makefile: New file. * sysdeps/unix/sysv/linux/sh/Versions: New file. * sysdeps/unix/sysv/linux/sh/bits/mman.h: New file. * sysdeps/unix/sysv/linux/sh/bits/resource.h: New file. * sysdeps/unix/sysv/linux/sh/brk.c: New file. * sysdeps/unix/sysv/linux/sh/chown.c: New file. * sysdeps/unix/sysv/linux/sh/clone.S: New file. * sysdeps/unix/sysv/linux/sh/fchown.c: New file. * sysdeps/unix/sysv/linux/sh/fxstat.c: New file. * sysdeps/unix/sysv/linux/sh/getegid.c: New file. * sysdeps/unix/sysv/linux/sh/geteuid.c: New file. * sysdeps/unix/sysv/linux/sh/getgroups.c: New file. * sysdeps/unix/sysv/linux/sh/getresgid.c: New file. * sysdeps/unix/sysv/linux/sh/getresuid.c: New file. * sysdeps/unix/sysv/linux/sh/getrlimit.c: New file. * sysdeps/unix/sysv/linux/sh/getrlimit64.c: New file. * sysdeps/unix/sysv/linux/sh/getuid.c: New file. * sysdeps/unix/sysv/linux/sh/lchown.c: New file. * sysdeps/unix/sysv/linux/sh/lxstat.c: New file. * sysdeps/unix/sysv/linux/sh/msgctl.c: New file. * sysdeps/unix/sysv/linux/sh/oldgetrlimit64.c: New file. * sysdeps/unix/sysv/linux/sh/pipe.S: New file. * sysdeps/unix/sysv/linux/sh/profil-counter.h: New file. * sysdeps/unix/sysv/linux/sh/semctl.c: New file. * sysdeps/unix/sysv/linux/sh/setegid.c: New file. * sysdeps/unix/sysv/linux/sh/seteuid.c: New file. * sysdeps/unix/sysv/linux/sh/setfsgid.c: New file. * sysdeps/unix/sysv/linux/sh/setfsuid.c: New file. * sysdeps/unix/sysv/linux/sh/setgid.c: New file. * sysdeps/unix/sysv/linux/sh/setgroups.c: New file. * sysdeps/unix/sysv/linux/sh/setregid.c: New file. * sysdeps/unix/sysv/linux/sh/setresgid.c: New file. * sysdeps/unix/sysv/linux/sh/setresuid.c: New file. * sysdeps/unix/sysv/linux/sh/setreuid.c: New file. * sysdeps/unix/sysv/linux/sh/setrlimit.c: New file. * sysdeps/unix/sysv/linux/sh/setuid.c: New file. * sysdeps/unix/sysv/linux/sh/sh3/register-dump.h: New file. * sysdeps/unix/sysv/linux/sh/sh4/register-dump.h: New file. * sysdeps/unix/sysv/linux/sh/shmctl.c: New file. * sysdeps/unix/sysv/linux/sh/sigcontextinfo.h: New file. * sysdeps/unix/sysv/linux/sh/socket.S: New file. * sysdeps/unix/sysv/linux/sh/sys/io.h: New file. * sysdeps/unix/sysv/linux/sh/sys/ucontext.h: New file. * sysdeps/unix/sysv/linux/sh/sys/user.h: New file. * sysdeps/unix/sysv/linux/sh/syscalls.list: New file. * sysdeps/unix/sysv/linux/sh/sysdep.S: New file. * sysdeps/unix/sysv/linux/sh/sysdep.h: New file. * sysdeps/unix/sysv/linux/sh/vfork.S: New file. * sysdeps/unix/sysv/linux/sh/xstat.c: New file.