06-27-2013
If you got a positive number from open(), then the errno was set earlier by some other call, unless your code does something interesting or untoward.... We do need to see some code please.
Note that system calls do not reset errno to zero, so if you do not reliably check returns codes, then it may not be possible to see where the error originated. system calls set errno ONLY when they have an error condition.
This User Gave Thanks to jim mcnamara For This Post:
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LEARN ABOUT CENTOS
errno.h
errno.h(3HEAD) Headers errno.h(3HEAD)
NAME
errno.h, errno - system error numbers
SYNOPSIS
#include <errno.h>
DESCRIPTION
The <errno.h> header provides a declaration for errno and gives positive values for the symbolic constants listed on the intro(2) manual
page.
USAGE
Values for errno are required to be distinct positive values rather than non-zero values.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
intro(2), attributes(5), standards(5)
SunOS 5.10 10 Sep 2004 errno.h(3HEAD)