threads/strerror_test.c

This is threads/strerror_test.c (Listing 31-2, page 665), an example from the book, The Linux Programming Interface.

The source code file is copyright 2022, Michael Kerrisk, and is licensed under the GNU General Public License, version 3.

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/* strerror_test.c

   A program to test whether the implementation of strerror() thread-safe.
*/
#include <stdio.h>
#include <string.h>                 /* Get declaration of strerror() */
#include <pthread.h>
#include "tlpi_hdr.h"
static void *
threadFunc(void *arg)
{
    char *str;

    printf("Other thread about to call strerror()\n");
    str = strerror(EPERM);
    printf("Other thread: str (%p) = %s\n", str, str);

    return NULL;
}
int
main(int argc, char *argv[])
{
    pthread_t t;
    int s;
    char *str;

    str = strerror(EINVAL);
    printf("Main thread has called strerror()\n");

    s = pthread_create(&t, NULL, threadFunc, NULL);
    if (s != 0)
        errExitEN(s, "pthread_create");

    s = pthread_join(t, NULL);
    if (s != 0)
        errExitEN(s, "pthread_join");

    /* If strerror() is not thread-safe, then the output of this printf() be
       the same as that produced by the analogous printf() in threadFunc() */

    printf("Main thread:  str (%p) = %s\n", str, str);

    exit(EXIT_SUCCESS);
}

 

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