perror

Prints a textual description of the error code currently stored in the system variable errno to stderr .

The description is formed by concatenating the following components:

• the contents of the null-terminated byte string pointed to by s, followed by ": " (unless s is a null pointer or the character pointed to by s is the null character)
• implementation-defined error message string describing the error code stored in errno, followed by '\n'. The error message string is identical to the result of strerror (errno).

[edit] Parameters

[edit] Return value

(none)

[edit] Example

#include <stdio.h>
 
int main(void)
{
 FILE *f = fopen ("non_existent", "r");
 if (f == NULL ) {
 perror("fopen() failed");
 } else {
 fclose (f);
 }
}

fopen() failed: No such file or directory

[edit] References

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