forkexec.c

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/*
* File:    forkexec.c
* Author:  Philip Mucci
*          mucci@cs.utk.edu
* Mods:    <your name here>
*          <your email address>
*/
 
/* This file performs the following test:
 
            PAPI_library_init();
        PAPI_shutdown()
            fork()
               /      \
            parent   child
        wait()   execlp()
                     PAPI_library_init()
 
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>
 
#include "papi.h"
#include "papi_test.h"
 
 
int
main( int argc, char **argv )
{
    int retval;
    int quiet;
    int status;
 
    /* Set TESTS_QUIET variable */
    quiet = tests_quiet( argc, argv );
 
    if ( ( argc > 1 ) && ( strcmp( argv[1], "xxx" ) == 0 ) ) {
        /* In child */
        retval = PAPI_library_init( PAPI_VER_CURRENT );
        if ( retval != PAPI_VER_CURRENT ) {
            test_fail( __FILE__, __LINE__, "execed PAPI_library_init", retval );
        }
        return 0;
    } else {
        if (!quiet) printf("Test fork/exec/PAPI_init\n");
        /* Init PAPI */
        retval = PAPI_library_init( PAPI_VER_CURRENT );
        if ( retval != PAPI_VER_CURRENT ) {
            test_fail( __FILE__, __LINE__, "main PAPI_library_init", retval );
        }
        /* Then shut down ? */
        PAPI_shutdown(  );
 
        if ( fork(  ) == 0 ) {
            /* In child, exec ourself with "xxx" command line */
            if ( execlp( argv[0], argv[0], "xxx", NULL ) == -1 ) {
                test_fail( __FILE__, __LINE__, "execlp", PAPI_ESYS );
            }
        } else {
            /* In parent, wait for child to finish */
            wait( &status );
            if ( WEXITSTATUS( status ) != 0 ) {
                test_fail( __FILE__, __LINE__, "fork", WEXITSTATUS( status ) );
            }
        }
    }
 
    test_pass( __FILE__ );
 
    return 0;
 
}