02-23-2009
This has been a problem with UNIX over time - different "parentage" of a unix system may mean using different system calls. There have been a lot of attempts to get past this problem. POSIX (or SUSVn - the Single UNIX Specification Version nn) is one.
I would try this link here on the forums:
https://www.unix.com/unix-ieee-std-10...html#post26442
Note - POSIX does not attempt to deal with any implementation specifics, it just says this function() will do this. If you stick with POSIX as much as possible, porting is much less of a problem. It does not make it go away altogether.
VxWorks is a realtime system - I do not think POSIX will help that much - but I do not know VxWorks.
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LEARN ABOUT CENTOS
getgid
GETGID(3P) POSIX Programmer's Manual GETGID(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
getgid - get the real group ID
SYNOPSIS
#include <unistd.h>
gid_t getgid(void);
DESCRIPTION
The getgid() function shall return the real group ID of the calling process.
RETURN VALUE
The getgid() function shall always be successful and no return value is reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
getegid(), geteuid(), getuid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid(), the Base Definitions volume of
IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 GETGID(3P)