C-language based signal programming instance _c language under Linux

This article illustrates the C-language based signal programming method under Linux. Share to everyone for your reference. as follows:

#include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <unistd.h> #include <
  signal.h> void Sig_handler (int sig_no, siginfo_t *info, void *ctext) {printf ("Receive sig_no=%d\n", sig_no); if (sig_no = = sigquit) {printf ("Haha, do you want to quit?")
  ");
    }else{printf ("si_signo=%d\n", Info->si_signo);
    printf ("Si_code =%d\n", Info->si_code);
    printf ("Si_pid =%d\n", info->si_pid);
    printf ("Si_uid =%d\n", info->si_uid);
    printf ("si_status=%d\n", info->si_status);
    printf ("Si_utime =%lld\n", info->si_utime);
    printf ("Si_stime =%lld\n", info->si_stime);
    printf ("Si_value =%d\n", info->si_value);
    printf ("Si_addr =0x%x\n", info->si_addr);
  printf ("Si_fd =%d\n", INFO-&GT;SI_FD);
} return; /*--------------------Common Signal list----------------------------/*//sigint CTRL + C//sigquit ctrl+\//sigpipe pipe rupture//sigkill Process terminated, cannot be captured//sighup shell exits//sigchld terminating signal//SIGFPE floating-point number exception (divided by 0)//sigterm termination signal (kill PID) int main (inT argc, char **argv) {struct sigaction sa;
  sa.sa_flags = 0;
  Sa.sa_sigaction = Sig_handler;  Sa.sa_flags |= Sa_siginfo; Use Sa_sigaction as callback//sa.sa_flags |= Sa_resethand; The handler function is only invoked once, and then the//sa.sa_flags |= sa_nocldstop is reset;  If the SIGCLD is installed, the subprocess does not exit normally, but is killed, the//sa.sa_flags |= Sa_nodefer is not notified;  The shielding of the signal is invalid, that is, the signal processing function can still be emitted during the execution of this signal//sa.sa_flags |= Sa_restart; //sa.sa_flags |= sa_nocldwait is automatically restarted by a system call that is interrupted by a signal;
  Causes the parent process to not receive a SIGCHLD signal when its child process exits, and the subprocess does not become a zombie//install signal if (sigaction (sigint,&sa,null) ==-1) printf ("Failed to install signal");
  if (Sigaction (sigquit,&sa,null) ==-1) printf ("Failed to install signal \ n");
  while (1) {sleep (1);
return 0; }/*--------------------------signal programming-related structure----------------------------------//struct sigaction {//void (*sa_handler
 ) (int);
 void (*sa_sigaction) (int, siginfo_t *, void *);
 sigset_t Sa_mask;
 int sa_flags;
 void (*sa_restorer) (void); }//siginfo_t {//int Si_signo/* Signal number *//int si_errno; * An errno value *//int si_code;  /* Signal code *//pid_t si_pid;  /* Sending Process ID *//uid_t si_uid; /* Real user ID of sending process *//int si_status;  /* Exit value or signal *///clock_t si_utime; User time consumed//clock_t si_stime; /* System Time consumed *//sigval_t si_value;  /* Signal value *//int si_int;  /* POSIX.1B signal *//void * SI_PTR;  /* POSIX.1B signal *//void * SI_ADDR;  /* Memory location which caused fault *//int si_band;   /* Band Event *//int si_fd;       -C occurs//Sigquit 3 core Keyboard input Exit command//Sigill 4 core error directive//SIGABRT 6 Core abort (3) signaled abort//SIGFPE 8 Core floating point anomaly//SIGKILL 9 Term Kill signal//SIGSEGV core illegal memory access//sigpipe Term Pipe disconnect//SIGALRM Abort signal//sigterm Term forced stop signal issued by Term Alarm (2)/SIGUSR1 30,10,16 Term user-defined signal 1//SIGUSR2 31,12,17 Term user-defined signal 2//SIGCHLD 20,17,18 IGN Sub Process abort signal//Sigcont 19,   18,25 Cont continues to execute a stopped process//SIGSTOP 17,19,23 stop signal from terminal stops//SIGTSTP stop signal from end 18,20,24//Sigttin 21,21,26

 Stop background process read Terminal//Sigttou 22,22,27 Stop background process write terminal

I hope this article will help you with your C language program.