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PERROR(3) Linux Programmer's Manual PERROR(3) NAME
perror - print a system error message SYNOPSIS
#include <stdio.h> void perror(const char *s); #include <errno.h> const char *sys_errlist[]; int sys_nerr; int errno; Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sys_errlist, sys_nerr: _BSD_SOURCE DESCRIPTION
The routine perror() produces a message on the standard error output, describing the last error encountered during a call to a system or library function. First (if s is not NULL and *s is not a null byte ('