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6310e6be9b
glibc/libio
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Adhemerval Zanella 14d0e87d9b posix: Use posix_spawn on popen 
This patch uses posix_spawn on popen instead of fork and execl.  On Linux
this has the advantage of much lower memory consumption (usually 32 Kb
minimum for the mmap stack area).

Two issues are also fixed with this change:

  * BZ#17490: although POSIX pthread_atfork description only list 'fork'
    as the function that should execute the atfork handlers, popen
    description states that:

      '[...] shall be *as if* a child process were created within the popen()
       call using the fork() function [...]'

    Other libc/system seems to follow the idea atfork handlers should not be
    executed for popen:

    libc/system	| run atfork handles   | notes
    ------------|----------------------|---------------------------------------
    Freebsd	|        no            | uses vfork
    Solaris 11	|        no            |
    MacOSX 11   |        no            | implemented through posix_spawn syscall
    ------------|----------------------|----------------------------------------

    Similar to posix_spawn and system, popen idea is to spawn a different
    binary so all the POSIX rationale to run the atfork handlers to avoid
    internal process inconsistency is not really required and in some cases
    might be unsafe.

  * BZ#22834: the described scenario, where the forked process might access
    invalid memory due an inconsistent state in multithreaded environment,
    should not happen because posix_spawn does not access the affected
    data structure (proc_file_chain).

Checked on x86_64-linux-gnu and i686-linux-gnu.

	[BZ #22834]
	[BZ #17490]
	* NEWS: Add new semantic for atfork with popen and system.
	* libio/iopopen.c (_IO_new_proc_open): use posix_spawn instead of
	fork and execl.
2018-11-30 18:42:05 -02:00
..
bits Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
__fbufsize.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__flbf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__fpending.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__fpurge.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__freadable.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__freading.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__fsetlocking.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__fwritable.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
__fwriting.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bug-fopena+.c
bug-fseek.c
bug-ftell.c
bug-memstream1.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
bug-mmap-fflush.c
bug-rewind2.c Fix warnings in fwscanf / rewind tests. 2014-11-26 12:54:39 +00:00
bug-rewind.c Fix warnings in fwscanf / rewind tests. 2014-11-26 12:54:39 +00:00
bug-ungetc2.c
bug-ungetc3.c
bug-ungetc4.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bug-ungetc.c
bug-ungetwc1.c Fix libio/bug-ungetwc1.c warning. 2014-11-27 16:01:04 +00:00
bug-ungetwc2.c
bug-wfflush.c
bug-wmemstream1.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
bug-wsetpos.c
clearerr_u.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
clearerr.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
Depend
fcloseall.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
feof_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
feof.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
ferror_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
ferror.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
filedoalloc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fileno.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fileops.c [BZ 1190] Make EOF sticky in stdio. 2018-03-13 08:31:56 -04:00
fmemopen.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fputc_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fputc.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
fputwc_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fputwc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
freopen64.c libio: Flush stream at freopen (BZ#21037) 2018-10-02 10:01:56 -03:00
freopen.c libio: Flush stream at freopen (BZ#21037) 2018-10-02 10:01:56 -03:00
fseek.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fseeko64.c libio: Implement internal function __libc_readline_unlocked 2018-07-06 17:52:54 +02:00
fseeko.c libio: Implement internal function __libc_readline_unlocked 2018-07-06 17:52:54 +02:00
ftello64.c libio: Implement internal function __libc_readline_unlocked 2018-07-06 17:52:54 +02:00
ftello.c libio: Implement internal function __libc_readline_unlocked 2018-07-06 17:52:54 +02:00
fwide.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
fwprintf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fwscanf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
genops.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
getc_u.c Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463). 2018-02-21 18:01:11 +00:00
getc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getchar_u.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getchar.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
getwc_u.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getwc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getwchar_u.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getwchar.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
iofclose.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
iofdopen.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
iofflush_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofflush.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofgetpos64.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofgetpos.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofgets_u.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
iofgets.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
iofgetws_u.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
iofgetws.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
iofopen64.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofopen.c Remove legacy configuration knobs from libio. 2018-02-21 14:13:21 -05:00
iofopncook.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofputs_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofputs.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofputws_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofputws.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofread_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofread.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofsetpos64.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofsetpos.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
ioftell.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofwide.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofwrite_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iofwrite.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iogetdelim.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
iogetline.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iogets.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
iogetwline.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iolibio.h hurd: Avoid more libc.so local PLTs 2018-04-03 00:36:33 +00:00
iopadn.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iopopen.c posix: Use posix_spawn on popen 2018-11-30 18:42:05 -02:00
ioputs.c hurd: Avoid more libc.so local PLTs 2018-04-03 00:36:33 +00:00
ioseekoff.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
ioseekpos.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iosetbuffer.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iosetvbuf.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
ioungetc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
ioungetwc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iovdprintf.c Remove legacy configuration knobs from libio. 2018-02-21 14:13:21 -05:00
iovsprintf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iovsscanf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iovswscanf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
iowpadn.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
libc_fatal.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libio.h Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
libioP.h libio: Avoid ptrdiff_t overflow in IO_validate_vtable 2018-06-20 09:45:19 +02:00
Makefile libio: Flush stream at freopen (BZ#21037) 2018-10-02 10:01:56 -03:00
memstream.c libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] 2018-06-01 10:41:03 +02:00
obprintf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldfileops.c [BZ 1190] Make EOF sticky in stdio. 2018-03-13 08:31:56 -04:00
oldfmemopen.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldiofclose.c Remove _IO_file_flags define. 2018-02-21 14:22:50 -05:00
oldiofdopen.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
oldiofgetpos64.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldiofgetpos.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldiofopen.c Remove legacy configuration knobs from libio. 2018-02-21 14:13:21 -05:00
oldiofsetpos64.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldiofsetpos.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldiopopen.c Remove legacy configuration knobs from libio. 2018-02-21 14:13:21 -05:00
oldpclose.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
oldstdfiles.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
oldtmpfile.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pclose.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
peekc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
putc_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
putc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
putchar_u.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
putchar.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
putwc_u.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
putwc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
putwchar_u.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
putwchar.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
readline.c Fix copyright years in recent commits 2018-07-10 11:03:08 +02:00
rewind.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
setbuf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
setlinebuf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
stdfiles.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
stdio.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
stdio.h Add renameat2 function [BZ #17662] 2018-07-05 19:00:10 +02:00
strfile.h libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] 2018-06-01 10:41:03 +02:00
strops.c libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] 2018-06-01 10:41:03 +02:00
swprintf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
swscanf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fmemopen.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-freopen.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-freopen.sh Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst_getwc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst_getwc.input
tst_putwc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst_swprintf.c
tst_swscanf.c
tst_wprintf2.c Add dependencies on needed locales in each subdir tests (bug 18969) 2015-10-12 15:18:08 +02:00
tst_wprintf.c
tst_wscanf.c
tst_wscanf.input
tst-atime.c Don't reduce test timeout to less than default 2018-10-17 09:34:13 +02:00
tst-bz22415.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-eof.c
tst-ext2.c
tst-ext.c
tst-fgetc-after-eof.c [BZ 1190] Make EOF sticky in stdio. 2018-03-13 08:31:56 -04:00
tst-fgetwc.c
tst-fgetwc.input
tst-fgetws.c
tst-fopenloc2.c
tst-fopenloc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-fputws.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-freopen.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-fseek.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-ftell-active-handler.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-ftell-append.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-ftell-partial-wide.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-fwrite-error.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-memstream1.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-memstream2.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-memstream3.c libio: Rename _FWRITE to FWRITE_FUNC 2018-01-29 23:00:17 +01:00
tst-memstream4.c libio: Flush stream at freopen (BZ#21037) 2018-10-02 10:01:56 -03:00
tst-memstream.h libio: Flush stream at freopen (BZ#21037) 2018-10-02 10:01:56 -03:00
tst-mmap2-eofsync.c 2016-06-11 Paul Pluzhnikov <ppluzhnikov@google.com> 2016-06-11 14:50:16 -07:00
tst-mmap-eofsync.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
tst-mmap-fflushsync.c
tst-mmap-offend.c
tst-mmap-setvbuf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-popen1.c
tst-readline.c Increase timeout of libio/tst-readline 2018-10-09 15:56:12 +01:00
tst-setvbuf1.c
tst-sscanf.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-swscanf.c
tst-ungetwc1.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-ungetwc2.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-vtables-common.c support: Add signal support to support_capture_subprocess_check 2018-11-28 20:57:18 +01:00
tst-vtables-interposed.c libio: Add tst-vtables, tst-vtables-interposed 2018-06-26 12:31:08 +02:00
tst-vtables.c libio: Add tst-vtables, tst-vtables-interposed 2018-06-26 12:31:08 +02:00
tst-widetext.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-widetext.input Finish change from “Bengali” to “Bangla” 2017-09-09 12:41:54 +02:00
tst-wmemstream1.c
tst-wmemstream2.c
tst-wmemstream3.c libio: Rename _FWRITE to FWRITE_FUNC 2018-01-29 23:00:17 +01:00
tst-wmemstream4.c libio: Flush stream at freopen (BZ#21037) 2018-10-02 10:01:56 -03:00
vasprintf.c libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] 2018-06-01 10:41:03 +02:00
Versions libio: Implement internal function __libc_readline_unlocked 2018-07-06 17:52:54 +02:00
vscanf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
vsnprintf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
vswprintf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
vtables.c libio: Disable vtable validation in case of interposition [BZ #23313] 2018-06-26 10:24:52 +02:00
vwprintf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
vwscanf.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
wfiledoalloc.c Mechanically remove _IO_ name aliases for types and constants. 2018-02-21 14:11:05 -05:00
wfileops.c [BZ 1190] Make EOF sticky in stdio. 2018-03-13 08:31:56 -04:00
wgenops.c Remove miscellaneous debris from libio. 2018-02-21 14:39:54 -05:00
wmemstream.c libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] 2018-06-01 10:41:03 +02:00
wprintf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wscanf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wstrops.c libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] 2018-06-01 10:41:03 +02:00