hush/libbb/signals.c
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

122 lines
2.2 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2006 Rob Landley
* Copyright (C) 2006 Denys Vlasenko
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
/* All known arches use small ints for signals */
smallint bb_got_signal;
void record_signo(int signo)
{
bb_got_signal = signo;
}
/* Saves 2 bytes on x86! Oh my... */
int FAST_FUNC sigaction_set(int signum, const struct sigaction *act)
{
return sigaction(signum, act, NULL);
}
int FAST_FUNC sigprocmask_allsigs(int how)
{
sigset_t set;
sigfillset(&set);
return sigprocmask(how, &set, NULL);
}
void FAST_FUNC bb_signals(int sigs, void (*f)(int))
{
int sig_no = 0;
int bit = 1;
while (sigs) {
if (sigs & bit) {
sigs &= ~bit;
signal(sig_no, f);
}
sig_no++;
bit <<= 1;
}
}
void FAST_FUNC bb_signals_recursive(int sigs, void (*f)(int))
{
int sig_no = 0;
int bit = 1;
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = f;
/*sa.sa_flags = 0;*/
/*sigemptyset(&sa.sa_mask); - hope memset did it*/
while (sigs) {
if (sigs & bit) {
sigs &= ~bit;
sigaction_set(sig_no, &sa);
}
sig_no++;
bit <<= 1;
}
}
void FAST_FUNC sig_block(int sig)
{
sigset_t ss;
sigemptyset(&ss);
sigaddset(&ss, sig);
sigprocmask(SIG_BLOCK, &ss, NULL);
}
void FAST_FUNC sig_unblock(int sig)
{
sigset_t ss;
sigemptyset(&ss);
sigaddset(&ss, sig);
sigprocmask(SIG_UNBLOCK, &ss, NULL);
}
void FAST_FUNC wait_for_any_sig(void)
{
sigset_t ss;
sigemptyset(&ss);
sigsuspend(&ss);
}
/* Assuming the sig is fatal */
void FAST_FUNC kill_myself_with_sig(int sig)
{
signal(sig, SIG_DFL);
sig_unblock(sig);
raise(sig);
_exit(EXIT_FAILURE); /* Should not reach it */
}
void FAST_FUNC signal_SA_RESTART_empty_mask(int sig, void (*handler)(int))
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
/*sigemptyset(&sa.sa_mask);*/
sa.sa_flags = SA_RESTART;
sa.sa_handler = handler;
sigaction_set(sig, &sa);
}
void FAST_FUNC signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int))
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
/*sigemptyset(&sa.sa_mask);*/
/*sa.sa_flags = 0;*/
sa.sa_handler = handler;
sigaction_set(sig, &sa);
}