signal()
#include <signal.h>.
static void sig_hndl(int signo) //
{
signal (SIGINT, sig_hndl); // ,
printf(This is new handler for SIGINT\n); //
}
main()
{
signal(SIGINT, sig_hndl); //
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_IGN);
while(1)
pause();
}
$ a.out & -
5050 - pid
$ kill SIGINT 5050
This is new handler for SIGINT
$ kill SIGUSR2 5050 -
$ kill SIGUSR1 5050 - ( ).
POSIX
sigaction(2)
sigset_t (32 32 ). .
sigaction ( , ).
#include <signal.h>
int sigaction (int sig, const struct sigaction *act, const struct sigaction *oldact)
sigaction:
- void (*sa_handler) ()
- void (*sa_sigaction) (int, siginfo_t*, void*)
- sigset_t sa_mask; //
- int sa_flags; //
sa_handler <> 0 sa_sigaction <> 0, sa_mask , . , . . . . sa_flags .
siginfo_t - .
#include <siginfo_t.h>
struct siginfo_t{
int sig_no; //
int sig_errno; //
int sig_code; //
};
sigaction()
#include <signal.h>
sigemptyset(sig_set_t *set); // ,
sigfillset(sig_set_t *set); //
sigaddset(sig_set_t *set, int signo); // 1
sigdelset(sig_set_t *set, int signo); // 1
sigismemberset(sig_set_t *set, int signo); //
- .
.
- , , . : .
.
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
void (*oursignal (int signo, void (*hndlr)(int)) (int) //
{
struct sigaction act, oldact;
act.sa_handler = hndlr;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
if (signo!= SIGALARM) act.sa_flags |= SA_RESTART;
|
|
|
if (sigaction (signo, &act, &oldact) < 0) return (SIG_ERR);
return (oldact.sa_hndlr);
}
static void sig_hndlr (int signo);
{
printf(We are int handler\n); //
}
main()
{
oursignal(SIGINT, sig_hndl); //
oursignal(SIGUSR1, SIG_DFL);
oursignal(SIGUSR2, SIG_IGN);
while(1)
pause();
}
.
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