使用信號處理器和sigsuspend()來掛起一個進(jìn)程的執(zhí)行，直至傳來一個信號

通過文件描述符來獲取信號

/*************************************************************************\ * Copyright (C) Michael Kerrisk, 2018. * * * * This program is free software. You may use, modify, and redistribute it * * under the terms of the GNU General Public License as published by the * * Free Software Foundation, either version 3 or (at your option) any * * later version. This program is distributed without any warranty. See * * the file COPYING.gpl-v3 for details. * \*************************************************************************//* Listing 22-7 *//* signalfd_sigval.cUsage: signalfd_sigval sig-num...Demonstrate the use of signalfd() to receive signals via a file descriptor.This program is Linux-specific. The signalfd API is supported since kernel2.6.22. */ #include <sys/signalfd.h> #include <signal.h> #include "tlpi_hdr.h"int main(int argc, char *argv[]) {sigset_t mask;int sfd, j;struct signalfd_siginfo fdsi;ssize_t s;if (argc < 2 || strcmp(argv[1], "--help") == 0)usageErr("%s sig-num...\n", argv[0]);printf("%s: PID = %ld\n", argv[0], (long) getpid());sigemptyset(&mask);for (j = 1; j < argc; j++)sigaddset(&mask, atoi(argv[j]));if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)errExit("sigprocmask");sfd = signalfd(-1, &mask, 0);if (sfd == -1)errExit("signalfd");for (;;) {s = read(sfd, &fdsi, sizeof(struct signalfd_siginfo));if (s != sizeof(struct signalfd_siginfo))errExit("read");printf("%s: got signal %d", argv[0], fdsi.ssi_signo);if (fdsi.ssi_code == SI_QUEUE) {printf("; ssi_pid = %d; ", fdsi.ssi_pid);printf("ssi_int = %d", fdsi.ssi_int);}printf("\n");} }

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