04-30-2009
Quote:
Originally Posted by
squosl
The not so short answer would be that Unix is an OS, copyright owned by Bell Labs while Linux is a kernel, and depends on a crapload of utilities from the GNU project to put the whole OS together. Linux tries to be POSIX compliant, I'm not sure Unix is entirely POSIX compliant either.
A clarification - The Unix copyright is owned by Novell. AFAIR, they acquired it via USL and the Destiny project.
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LEARN ABOUT LINUX
geteuid32
GETUID(2) Linux Programmer's Manual GETUID(2)
NAME
getuid, geteuid - get user identity
SYNOPSIS
#include <unistd.h>
#include <sys/types.h>
uid_t getuid(void);
uid_t geteuid(void);
DESCRIPTION
getuid() returns the real user ID of the calling process.
geteuid() returns the effective user ID of the calling process.
When a normal program is executed, the effective and real user ID of the process are set to the ID of the user executing the file. When a
set ID program is executed the real user ID is set to the calling user and the effective user ID corresponds to the set ID bit on the file
being executed.
ERRORS
These functions are always successful.
CONFORMING TO
POSIX.1-2001, 4.3BSD.
NOTES
History
In Unix V6 the getuid() call returned (euid << 8) + uid. Unix V7 introduced separate calls getuid() and geteuid().
SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1993-07-23 GETUID(2)