{{keywords>wiki library source code example reference}}

====== perror ======
<code c>
    void perror(const char *str);
</code>

Prints str (if non-null) and strerror(errno) to standard error as would:
<code c>
fprintf(stderr, "%s: %s\n", (s != NULL ? s : ""), strerror(errno))
</code>
===== C Sourcecode Example =====
<code c>
/* 
 * perror example code
 * http://code-reference.com/c/stdio.h/perror 
 */

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */


int main ( void )
{
FILE *stream;

stream = fopen("test_not_exists.txt","r");

if (stream == 0) {
perror("Here comes the perror code ->");
return 1;
}

printf("its all fine\n");

fclose (stream);
return 0;

}
</code>

=== output ===
   ./perror 
    Here comes the perror code ->: No such file or directory