linux使用訊號傳遞訊息的說明與用法
阿新 • • 發佈：2018-12-21
下面是傳送訊號端的程式碼：
#define _GNU_SOURCE #include <signal.h> #include <string.h> #include <setjmp.h> #include "signal_functions.h" #include "tlpi_hdr.h" int main(int argc,char* argv[]) { int sig,numSigs,j,sigData; union sigval sv; if(argc<4||strcmp(argv[1],"--help") ==0) usageErr("%s pid sig-num data [num-sigs]\n", argv[0]); printf("%s: PID is %ld, UID is %ld\n", argv[0], (long) getpid(), (long) getuid()); sig = getInt(argv[2],0,"sig-num"); sigData=getInt(argv[3],GN_ANY_BASE,"data"); numSigs = (argc>4)?getInt(argv[4],GN_GT_0,"num-s"):1; for(j=0;j<numSigs;j++) { sleep(1); sv.sival_int = sigData+j; if(sigqueue(getLong(argv[1],0,"pid"),sig,sv)== -1) errExit("sigqueue %d",j); } exit(EXIT_SUCCESS); }
下面是接收訊號端的程式碼：
#define _GNU_SOURCE #include <signal.h> #include <stdio.h> #include <stdlib.h> static void handler(int signum,siginfo_t *sv,void *myact) { printf("receive signal %d\n", signum); printf("signal value is %d\n",sv->si_value.sival_int); } int main(int argc,char* argv[]) { struct sigaction sa; sa.sa_handler=handler; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_SIGINFO; /* Handler uses alternate stack */ if (sigaction(SIGINT, &sa, NULL) == -1) { perror("sigaction\n"); exit(1); } while(1) { sleep(1); } exit(EXIT_SUCCESS); }