GNU >> C/C++

signal

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Signal：

Number	Name	Function
1	SIGHUP	Hangup detected on controlling terminal or death of controlling process
2	SIGINT	Interrupt from keyboard (Ctrl+c)
3	SIGQUIT	Quit from keyboard
4	SIGILL	Illegal instruction
5	SIGTRAP	Trace trap
6	SIGABRT	Abort signal from abort
6	SIGIOT	I/O trap
7	SIGBUS	Bus error
8	SIGFPE	Floating point exception
9	SIGKILL	Kill signal
10	SIGUSR1	User define signal 1
11	SIGSEGV	Invalid memory reference
12	SIGUSR2	User define signal 2
13	SIGPIPE	Write to pipe with no readers
14	SIGALRM	Timer signal from alarm
15	SIGTERM	Termination signal
16	SIGTKFLT	Stack fault
17	SIGCHLD	Child status has changed
18	SIGCONT	Continue after stop
19	SIGSTOP	Stop(Ctrl+z)
20	SIGTSTP	Stop signal generated from keyboard
21	SIGTTIN	Background read attempted from control terminal
22	SIGTTOU	Background write attempted to control terminal
23	SIGURG	Urgent condition present on socket
24	SIGXCPU	CPU time limit exceeded
25	SIGXFSZ	File size limit exceeded
26	SIGVTALRM	Virtual time alarm
27	SIGPROF	Profiling timer alarm
28	SIGWINCH	Window changed
29	SIGIO	I/O is possible on a descriptor
29	SIGPOLL	I/O is possible on a descriptor
30	SIGPWR	UPS power Failure
31	SIGUNUSED	Unused

main.c

#include <signal.h>
#include <stdio.h>

volatile int exit_loop = 0;

void callback(int sig)
{
    printf("User break\n");
    signal(SIGINT, SIG_DFL);
    exit_loop = 1;
}

int main(int argc, char *argv[])
{
    signal(SIGINT, callback);

    printf("wait user break...\n");
    while (exit_loop == 0);
    printf("exit program\n");
    return 0;
}

編譯、執行

$ gcc main.c -o main
$ ./main 
    wait user break...
    ^C User break
    exit program

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