char * strerror ( int errnum );

<cstring>

Get pointer to error message string

Interprets the value of errnum generating a string describing the error that usually generates that error number value in calls to functions of the C library.

The returned pointer points to a statically allocated string, which shall not be modified by the program. Further calls to this function will overwrite its content.

The error strings produced by strerror depend on the developing platform and compiler.

Parameters

errnum

Error number.

Return Value

Example

/* strerror example : error list */
#include <stdio.h>
#include <string.h>
#include <errno.h>

int main ()
{
  FILE * pFile;
  pFile = fopen ("unexist.ent","r");
  if (pFile == NULL)
    printf ("Error opening file unexist.ent: %s\n",strerror(errno));
  return 0;
}

A possible output:

Error opening file unexist.ent: No such file or directory

See also