Errno Perror

[torn nebula]

Hi guys could someone explain to me what perror() does?

I know errno is global variable:

[hazy lance]

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[simple juniper]

!man perror(3)

[hazy lance]

man7

perror(3)

perror - print a system error message

Synopsis

#include <stdio.h>

void perror(const char *s);

#include <errno.h>

const char *const sys_errlist[];
int sys_nerr;
int errno;       /* Not really declared this way; see errno(3) */

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

sys_errlist, sys_nerr:

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