sigblock.c

unix环境高级编程的源代码

#include    <signal.h>
#include    <stddef.h>
#include    "ourhdr.h"

static sigset_t    newmask, oldmask;

void
sig_block(int signo)
{
    sigemptyset(&newmask);
    sigaddset(&newmask, signo);
            /* block specified signal and save current mask */
    if (sigprocmask(SIG_BLOCK, &newmask, &oldmask) < 0)
        err_sys("SIG_BLOCK error");
}

void
sig_unblock(void)
{
    if (sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0)
        log_sys("SIG_SETMASK error");
}