perror

Syntax

#include <stdio.h> void perror(const char *string);

Description

This function formats an error message and prints it to stderr. The message is the string, a colon and a blank, and a message suitable for the error condition indicated by errno. If string is a null pointer or points to a null string, the colon and blank are not printed.

Return Value

None.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001

Example

int x = open("foo", O_RDONLY); if (x < 0) { perror("foo"); exit(1); }