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Command: getuid | Section: 2 | Source: OpenBSD | File: getuid.2
GETUID(2) FreeBSD System Calls Manual GETUID(2)
NAME
getuid, geteuid - get user identification
SYNOPSIS
#include <unistd.h>
uid_t
getuid(void);
uid_t
geteuid(void);
DESCRIPTION
The getuid() function returns the real user ID of the calling process.
The geteuid() function returns the effective user ID of the calling
process.
The real user ID is that of the user who has invoked the program. As the
effective user ID gives the process additional permissions during
execution of "set-user-ID" mode processes, getuid() is used to determine
the real user ID of the calling process.
ERRORS
The getuid() and geteuid() functions are always successful, and no return
value is reserved to indicate an error.
SEE ALSO
getgid(2), getresuid(2), setreuid(2), setuid(2)
STANDARDS
The getuid() and geteuid() functions conform to IEEE Std 1003.1-2008
("POSIX.1").
HISTORY
The getuid() system call first appeared in Version 1 AT&T UNIX, and
geteuid() in Version 7 AT&T UNIX.
FreeBSD 14.1-RELEASE-p8 September 10, 2015 FreeBSD 14.1-RELEASE-p8