/**  * @FileName    sigterm.c * @Describe    Use kill function to send a signal to a process with the pid coming from argv[1] * @Author      vfhky 2015.08.03 https://typecodes.com/cseries/unixsigtermkill.html * @Excute      ./sigterm means sTerminate() do not exit before;  ./sigterm 1 means sTerminate() containing exit function. * @Return      0 */#include <stdio.h>#include <stdlib.h>#include <signal.h>void sTerminate();static int iExtFlag = 0;int main( int argc, char ** argv ){    sigset( SIGTERM, sTerminate );    printf( "Main process_pid=[%d] will sleep!\n", getpid() );    if( argc == 2 && *argv[1] == 0x31 )        iExtFlag = 1;    //the process will be hung up forever if not receving a signal.    pause();    //if there is a signal coming, this code will keep going.     printf( "Main process begin to work!\n" );    //let the process being sleeping 10 sec, and exit then.    sleep(10);    printf( "Main process exit!\n" );    return 0;}/** * functions to handle the signal of SIGTERM. * if the value of static variable iExtFlag is not equal zero, this func will exit without waiting for the main function to do to other things. */void sTerminate(){    printf( "Get a SIGTERM signal!\n" );    if( iExtFlag )    {        printf( "Making process exit!\n" );        exit(EXIT_SUCCESS);    }    return;}

/**  * @FileName    sigkill.c * @Describe    Use kill function to send a signal to a process with the pid from argv[1] * @Author      vfhky 2015.08.03 https://typecodes.com/cseries/unixsigtermkill.html * @Return      success:0    failure: -1 */#include <stdio.h>#include <stdlib.h>#include <signal.h>int main( int argc, char ** argv ){    if( argc != 2 )    {        printf( "Usage: ./sigkill process_pid" );        return -1;    }    printf( "You will send a signal to the process=[%s]!\n", argv[1] );    kill( atoi(argv[1]), SIGTERM );    printf( "Send over!\n" );    return 0;}