12-05-2011
If you're not making sure every call is successful, how do you know any of them were? You should be checking everything anyway. If you're not in the habit of doing so, there's no time like the present.
You can also view some things from the outside with a system utility like strace.
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LEARN ABOUT CENTOS
sys_errlist
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 ('