Stephen Heumann
656769d136
Work around GNO libc's buggy sigprocmask implementation by defining our own version of it. This should fix issues where hush could hang in wait() calls.
...
The sigprocmask implementation in GNO 2.0.6 libc has bugs that cause it to never actually unblock signals that have been blocked. This was causing many signals to remain blocked when they shouldn't be, particularly after running signal handlers.
This problem combined with a kernel issue (wait() calls won't recognize that a child has finished if SIGCHLD is blocked) to cause hangs in certain conditions.
This patch works around these issues by defining our own non-buggy version of sigprocmask in place of libc's.
2015-01-15 18:02:33 -06:00
Stephen Heumann
334678c6e9
Change various uses of signal masks to use 32-bit values (previously half the signals were essentially cut off).
2014-11-25 17:43:14 -06:00
Stephen Heumann
c37475dcbc
Change vfork_and_run implementation to inspect the kernel's process tables to determine whether the child has really exec'd or exited.
...
This should avoid strange behavior due to races when the parent has resumed but the child is still running the exec* code in libc, which mainly manifests itself when running at low speed.
We also change to signaling the child's completion with SIGALRM, and setting an extra alarm in the parent in case the child doesn't actually do it.
2014-11-10 16:08:24 -06:00
Stephen Heumann
cbdfea4c97
Revise signal handling to work with GNO.
...
This involved using signal() rather than sigaction(), which GNO doesn't have. signal() doesn't have the signal-blocking feature of sigaction(), but I've tried to emulate it.
2014-11-04 10:45:28 -06:00
Denys Vlasenko
c4f2d997a4
libbb: correctness/size tweaks in signal-related helpers
...
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2012-09-27 13:20:34 +02:00
Denys Vlasenko
0ef64bdb40
*: make GNU licensing statement forms more regular
...
This change retains "or later" state! No licensing _changes_ here,
only form is adjusted (article, space between "GPL" and "v2" and so on).
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-08-16 20:14:46 +02:00
Denis Vlasenko
cab28aa7de
init: preparatory patch, no code changes
2009-01-31 01:02:07 +00:00
Denis Vlasenko
08ea11ab07
runsvd: shrink by Vladimir
...
*: use unified trivial signal handler
function old new delta
record_signo - 10 +10
process_stdin 433 443 +10
bbunpack 383 391 +8
wc_main 598 605 +7
conescape 293 296 +3
nmeter_main 670 672 +2
fallbackSort 1717 1719 +2
bb_got_signal - 1 +1
microcom_main 713 712 -1
signalled 2 - -2
pack_gzip 1661 1659 -2
evalvar 1376 1374 -2
compare_keys 737 735 -2
parse_command 1460 1456 -4
expand 1748 1744 -4
s_term 37 29 -8
s_hangup 8 - -8
fgotsig 10 - -10
find_pair 187 169 -18
signal_handler 190 170 -20
runsvdir_main 1701 1583 -118
------------------------------------------------------------------------------
(add/remove: 2/3 grow/shrink: 6/10 up/down: 43/-199) Total: -156 bytes
2008-09-11 19:51:11 +00:00
Denis Vlasenko
defc1ea340
*: introduce and use FAST_FUNC: regparm on i386, otherwise no-on
...
text data bss dec hex filename
808035 611 6868 815514 c719a busybox_old
804472 611 6868 811951 c63af busybox_unstripped
2008-06-27 02:52:20 +00:00
Bernhard Reutner-Fischer
636a1f85e8
- use EXIT_{SUCCESS,FAILURE}. No object-code changes
2008-05-19 09:29:47 +00:00
Denis Vlasenko
3f165fa5b3
libbb: introduce and use sigprocmask_allsigs and sigaction_set.
...
libbb: rename sig_pause to wait_for_any_sig.
2008-03-17 08:29:08 +00:00
Denis Vlasenko
8e2cfec1cd
libbb: introduse and use signal_[no_]SA_RESTART_empty_mask and sigaction_set
...
signal_SA_RESTART_empty_mask - 65 +65
signal_no_SA_RESTART_empty_mask - 54 +54
dd_main 1325 1369 +44
sigaction_set - 19 +19
dname_enc 373 377 +4
UNSPEC_print 64 66 +2
setsignal 296 294 -2
bb_signals_recursive 95 92 -3
bb_askpass 367 361 -6
inetd_main 1810 1797 -13
rx_main 912 883 -29
sigdelset 32 - -32
__sigdelset 32 - -32
__GI_sigdelset 32 - -32
sighup_handler 84 37 -47
arping_main 1844 1797 -47
fsck_main 1869 1807 -62
run_list 1917 1844 -73
vlock_main 492 409 -83
progressmeter 883 798 -85
handle_incoming_and_exit 2737 2651 -86
------------------------------------------------------------------------------
(add/remove: 3/3 grow/shrink: 3/12 up/down: 188/-632) Total: -444 bytes
2008-03-12 23:19:35 +00:00
Denis Vlasenko
4cf1d08fc2
nc: remove a bit of bloat
...
inetd: more NOMMU fixes
rx: shrink
devfsd: minor shrink
vlock: shrink
tcpudp: narrow down window where we have no wildcard socket
parse_one_line 1015 1102 +87
init_ring - 53 +53
xzalloc_lsa - 48 +48
read_byte 51 50 -1
rearm_alarm 28 25 -3
nc_main 1028 1000 -28
initring 53 - -53
vlock_main 583 496 -87
reread_config_file 1089 991 -98
rx_main 1046 912 -134
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 1/6 up/down: 188/-404) Total: -216 bytes
text data bss dec hex filename
800120 661 7428 808209 c5511 busybox_old
799796 661 7428 807885 c53cd busybox_unstripped
2008-03-12 23:13:50 +00:00
Denis Vlasenko
d18f52bd18
actually add bb_qsort.c
...
*: s/Denis/Denys/
2008-03-02 12:53:15 +00:00
Denis Vlasenko
400d8bb45e
less,klogd,syslogd,nc,tcpudp: exit on signal by killing itself, not exit(1)
...
*: minor shrink
2008-02-24 13:36:01 +00:00
Denis Vlasenko
25591c322c
libbb: introduce bb_signals and bb_signals_recursive,
...
which sets same handler for many signals. sig_catch is nuked
(bb_signals_recursive is more descriptive name).
*: use them as appropriate.
function old new delta
bb_signals_recursive - 95 +95
bb_signals - 52 +52
run_command 258 273 +15
svlogd_main 1368 1377 +9
runsv_main 1746 1752 +6
runsvdir_main 1643 1646 +3
UNSPEC_print 64 66 +2
time_main 1128 1127 -1
...
resize_main 246 210 -36
sig_catch 63 - -63
set_fatal_sighandler 85 14 -71
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 5/24 up/down: 182/-548) Total: -366 bytes
2008-02-16 22:58:56 +00:00
