?? suspend2.c
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#include "apue.h"volatile sig_atomic_t quitflag; /* set nonzero by signal handler */static voidsig_int(int signo) /* one signal handler for SIGINT and SIGQUIT */{ if (signo == SIGINT) printf("\ninterrupt\n"); else if (signo == SIGQUIT) quitflag = 1; /* set flag for main loop */}intmain(void){ sigset_t newmask, oldmask, zeromask; if (signal(SIGINT, sig_int) == SIG_ERR) err_sys("signal(SIGINT) error"); if (signal(SIGQUIT, sig_int) == SIG_ERR) err_sys("signal(SIGQUIT) error"); sigemptyset(&zeromask); sigemptyset(&newmask); sigaddset(&newmask, SIGQUIT); /* * Block SIGQUIT and save current signal mask. */ if (sigprocmask(SIG_BLOCK, &newmask, &oldmask) < 0) err_sys("SIG_BLOCK error"); while (quitflag == 0) sigsuspend(&zeromask); /* * SIGQUIT has been caught and is now blocked; do whatever. */ quitflag = 0; /* * Reset signal mask which unblocks SIGQUIT. */ if (sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0) err_sys("SIG_SETMASK error"); exit(0);}
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