47 lines
934 B
C
47 lines
934 B
C
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/signal.h>
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static void sig_hup(int singo) {
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printf("SIGHUP received, pid = %ld, signo = %d\n", (long) getpid(), singo);
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}
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static void pr_ids(char * name) {
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printf("%s: pid = %ld, ppid = %ld, pgrp = %ld, tpgrp = %ld\n",
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name, (long)getpid(), (long)getppid(), (long)getpgrp(), (long)tcgetpgrp(STDIN_FILENO));
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fflush(stdout);
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}
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int main(void) {
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char c;
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pid_t pid;
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pr_ids("parent");
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if((pid = fork()) < 0) {
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printf("fork error\n");
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exit(-1);
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}
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else if (pid > 0) {
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printf("parent sleep...\n");
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sleep(3);
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printf("parent exit.\n");
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}
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else {
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pr_ids("child");
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signal(SIGHUP, sig_hup);
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kill(getpid(), SIGTSTP);
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pr_ids("child2");
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if(read(STDIN_FILENO, &c, 1) != 1){
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printf("read error %d on controlling TTY\n", errno);
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exit(-1);
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}
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exit(0);
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}
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return 0;
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}
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