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libbb: introduce and use sigprocmask_allsigs and sigaction_set.

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libbb: rename sig_pause to wait_for_any_sig.
This commit is contained in:
Denis Vlasenko 2008-03-17 08:29:08 +00:00
parent 8e2cfec1cd
commit 3f165fa5b3
7 changed files with 31 additions and 64 deletions
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13
include/libbb.h
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@ -311,13 +311,14 @@ void bb_signals_recursive(int sigs, void (*f)(int));
void signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int));
/* syscalls like read() won't be interrupted (though select/poll will be): */
void signal_SA_RESTART_empty_mask(int sig, void (*handler)(int));
/* Will do sigaction(signum, act, NULL): */
int sigaction_set(int signum, const struct sigaction *act);
void sig_block(int);
void sig_unblock(int);
/* UNUSED: void sig_blocknone(void); */
void sig_pause(void);
void wait_for_any_sig(void);
void kill_myself_with_sig(int sig) ATTRIBUTE_NORETURN;
void sig_block(int sig);
void sig_unblock(int sig);
/* Will do sigaction(signum, act, NULL): */
int sigaction_set(int sig, const struct sigaction *act);
/* SIG_BLOCK/SIG_UNBLOCK all signals: */
int sigprocmask_allsigs(int how);
void xsetgid(gid_t gid);

31
init/init.c
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@ -526,27 +526,13 @@ static void init_reboot(unsigned long magic)
static void kill_all_processes(void)
{
sigset_t block_signals;
/* run everything to be run at "shutdown". This is done _prior_
* to killing everything, in case people wish to use scripts to
* shut things down gracefully... */
run_actions(SHUTDOWN);
/* first disable all our signals */
sigfillset(&block_signals);
/*sigemptyset(&block_signals);
sigaddset(&block_signals, SIGHUP);
sigaddset(&block_signals, SIGQUIT);
sigaddset(&block_signals, SIGCHLD);
sigaddset(&block_signals, SIGUSR1);
sigaddset(&block_signals, SIGUSR2);
sigaddset(&block_signals, SIGINT);
sigaddset(&block_signals, SIGTERM);
sigaddset(&block_signals, SIGCONT);
sigaddset(&block_signals, SIGSTOP);
sigaddset(&block_signals, SIGTSTP);*/
sigprocmask(SIG_BLOCK, &block_signals, NULL);
sigprocmask_allsigs(SIG_BLOCK);
message(L_CONSOLE | L_LOG, "The system is going down NOW!");
@ -593,26 +579,13 @@ static void halt_reboot_pwoff(int sig)
static void exec_restart_action(int sig ATTRIBUTE_UNUSED)
{
struct init_action *a;
sigset_t unblock_signals;
for (a = init_action_list; a; a = a->next) {
if (a->action_type & RESTART) {
kill_all_processes();
/* unblock all signals (blocked in kill_all_processes()) */
sigfillset(&unblock_signals);
/*sigemptyset(&unblock_signals);
sigaddset(&unblock_signals, SIGHUP);
sigaddset(&unblock_signals, SIGQUIT);
sigaddset(&unblock_signals, SIGCHLD);
sigaddset(&unblock_signals, SIGUSR1);
sigaddset(&unblock_signals, SIGUSR2);
sigaddset(&unblock_signals, SIGINT);
sigaddset(&unblock_signals, SIGTERM);
sigaddset(&unblock_signals, SIGCONT);
sigaddset(&unblock_signals, SIGSTOP);
sigaddset(&unblock_signals, SIGTSTP);*/
sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
sigprocmask_allsigs(SIG_UNBLOCK);
/* Open the new terminal device */
open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);

2
ipsvd/tcpudp.c
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@ -290,7 +290,7 @@ int tcpudpsvd_main(int argc, char **argv)
hccp = NULL;
while (cnum >= cmax)
sig_pause(); /* wait for any signal (expecting SIGCHLD) */
wait_for_any_sig(); /* expecting SIGCHLD */
/* Accept a connection to fd #0 */
again1:

18
libbb/signals.c
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@ -17,6 +17,13 @@ int sigaction_set(int signum, const struct sigaction *act)
return sigaction(signum, act, NULL);
}
int sigprocmask_allsigs(int how)
{
sigset_t set;
sigfillset(&set);
return sigprocmask(how, &set, NULL);
}
void bb_signals(int sigs, void (*f)(int))
{
int sig_no = 0;
@ -69,16 +76,7 @@ void sig_unblock(int sig)
sigprocmask(SIG_UNBLOCK, &ss, NULL);
}
#if 0
void sig_blocknone(void)
{
sigset_t ss;
sigemptyset(&ss);
sigprocmask(SIG_SETMASK, &ss, NULL);
}
#endif
void sig_pause(void)
void wait_for_any_sig(void)
{
sigset_t ss;
sigemptyset(&ss);

22
networking/inetd.c
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@ -378,12 +378,12 @@ static void block_CHLD_HUP_ALRM(sigset_t *m)
sigaddset(m, SIGCHLD);
sigaddset(m, SIGHUP);
sigaddset(m, SIGALRM);
sigprocmask(SIG_BLOCK, m, NULL);
sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
}
static void unblock_sigs(sigset_t *m)
static void restore_sigmask(sigset_t *m)
{
sigprocmask(SIG_UNBLOCK, m, NULL);
sigprocmask(SIG_SETMASK, m, NULL);
}
#if ENABLE_FEATURE_INETD_RPC
@ -870,7 +870,7 @@ static servtab_t *insert_in_servlist(servtab_t *cp)
block_CHLD_HUP_ALRM(&omask);
sep->se_next = serv_list;
serv_list = sep;
unblock_sigs(&omask);
restore_sigmask(&omask);
return sep;
}
@ -941,7 +941,7 @@ static void reread_config_file(int sig ATTRIBUTE_UNUSED)
for (i = 0; i < MAXARGV; i++)
SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
#undef SWAP
unblock_sigs(&omask);
restore_sigmask(&omask);
free_servtab_strings(cp);
}
after_check:
@ -1052,7 +1052,7 @@ static void reread_config_file(int sig ATTRIBUTE_UNUSED)
free_servtab_strings(sep);
free(sep);
}
unblock_sigs(&omask);
restore_sigmask(&omask);
}
static void reap_child(int sig ATTRIBUTE_UNUSED)
@ -1252,7 +1252,7 @@ int inetd_main(int argc, char **argv)
sep->se_fd = -1;
sep->se_count = 0;
rearm_alarm(); /* will revive it in RETRYTIME sec */
unblock_sigs(&omask);
restore_sigmask(&omask);
maybe_close(accepted_fd);
continue; /* -> check next fd in fd set */
}
@ -1272,7 +1272,7 @@ int inetd_main(int argc, char **argv)
if (pid < 0) { /* fork error */
bb_perror_msg("fork");
sleep(1);
unblock_sigs(&omask);
restore_sigmask(&omask);
maybe_close(accepted_fd);
continue; /* -> check next fd in fd set */
}
@ -1288,7 +1288,7 @@ int inetd_main(int argc, char **argv)
/* we passed listening socket to child,
* will wait for child to terminate */
}
unblock_sigs(&omask);
restore_sigmask(&omask);
maybe_close(accepted_fd);
continue; /* -> check next fd in fd set */
}
@ -1300,7 +1300,7 @@ int inetd_main(int argc, char **argv)
close(sep->se_fd); /* listening socket */
logmode = 0; /* make xwrite etc silent */
}
unblock_sigs(&omask);
restore_sigmask(&omask);
if (sep->se_socktype == SOCK_STREAM)
sep->se_builtin->bi_stream_fn(ctrl, sep);
else
@ -1383,7 +1383,7 @@ int inetd_main(int argc, char **argv)
for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
maybe_close(sep2->se_fd);
sigaction_set(SIGPIPE, &saved_pipe_handler);
unblock_sigs(&omask);
restore_sigmask(&omask);
BB_EXECVP(sep->se_program, sep->se_argv);
bb_perror_msg("exec %s", sep->se_program);
do_exit1:

4
shell/ash.c
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@ -273,13 +273,11 @@ static void
raise_interrupt(void)
{
int i;
sigset_t mask;
intpending = 0;
/* Signal is not automatically unmasked after it is raised,
* do it ourself - unmask all signals */
sigemptyset(&mask);
sigprocmask(SIG_SETMASK, &mask, NULL);
sigprocmask_allsigs(SIG_UNBLOCK);
/* pendingsig = 0; - now done in onsig() */
i = EXSIG;

5
shell/hush.c
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@ -788,11 +788,8 @@ static void handler_ctrl_z(int sig)
static void sigexit(int sig) ATTRIBUTE_NORETURN;
static void sigexit(int sig)
{
sigset_t block_all;
/* Disable all signals: job control, SIGPIPE, etc. */
sigfillset(&block_all);
sigprocmask(SIG_SETMASK, &block_all, NULL);
sigprocmask_allsigs(SIG_BLOCK);
if (interactive_fd)
tcsetpgrp(interactive_fd, saved_tty_pgrp);