perror(3C)perror(3C)NAME
perror, errno - print system error messages
SYNOPSIS
#include <stdio.h>
void perror (const char *s);
#include <errno.h>
extern int errno;
DESCRIPTION
perror produces a message on the standard error output (file descriptor
2), describing the last error encountered during a call to a system or
library function. The argument string s is printed first, then a colon
and a blank, then the message and a newline. (However, if s is a null
pointer or points to a null string, the colon is not printed.) To be of
most use, the argument string should include the name of the program that
incurred the error. The error number is taken from the external variable
errno, which is set when errors occur but not cleared when non-erroneous
calls are made.
SEE ALSOintro(2), fmtmsg(3C), strerror(3C), oserror(3C).
NOTE
Code using sys_errlist, and _sys_errlist directly will not be able to
display any errno greater than 152.
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