GETUID(2) MachTen Programmer’s Manual GETUID(2)

NAME
getuid, geteuid - get user identification

SYNOPSIS
#include <unistd.h>
#include <sys/types.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 pro-
cess.

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 execu-
tion 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), setreuid(2)

STANDARDS
Geteuid() and getuid() conform to IEEE Std 1003.1-1988 (‘‘POSIX’’).

4th Berkeley Distribution June 4, 1993 1