spawn.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 71 行

#include <stdio.h>
#include <stdlib.h>
#include <process.h>
#include <errno.h>
#include <string.h>

void main()
{
    int     process_id;
#if defined(__OS2__) || defined(__NT__)
    int     status, rc;
#endif

    process_id = spawnl( P_NOWAIT, "child.exe",
                         "child", "5", NULL );
    if( process_id == -1 ) {
        printf( "spawn failed - %s\n", strerror( errno ) );
        exit( EXIT_FAILURE );
    }
    printf( "Process id = %d\n", process_id );

#if defined(__OS2__) || defined(__NT__)
    rc = cwait( &status, process_id, WAIT_CHILD );
    if( rc == -1 ) {
        printf( "wait failed - %s\n", strerror( errno ) );
    } else {
        printf( "wait succeeded - %x\n", status );
        switch( status & 0xff ) {
        case 0:
            printf( "Normal termination exit code = %d\n",
                    status >> 8 );
            break;
        case 1:
            printf( "Hard-error abort\n" );
            break;
        case 2:
            printf( "Trap operation\n" );
            break;
        case 3:
            printf( "SIGTERM signal not intercepted\n" );
            break;
        default:
            printf( "Bogus return status\n" );
        }
    }
#endif
    printf( "spawn completed\n" );
}

/*
[child.c]
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>

void main( int argc, char *argv[] )
{
    int delay;

    if( argc <= 1 )
        exit( EXIT_FAILURE );
    delay = atoi( argv[1] );
    printf( "I am a child going to sleep "
            "for %d seconds\n", delay );
    sleep( delay );
    printf( "I am a child awakening\n" );
    exit( 123 );

}
*/