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GETUID(2) | System Calls Manual | GETUID(2) |
NAME¶
getuid
,
geteuid
—
get user identification
LIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include
<unistd.h>
#include
<sys/types.h>
uid_t
getuid
(void);
uid_t
geteuid
(void);
DESCRIPTION¶
Thegetuid
() system call returns the real
user ID of the calling process. The
geteuid
() system call 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¶
Thegetuid
() and
geteuid
() system calls are always
successful, and no return value is reserved to indicate an error.
SEE ALSO¶
getgid(2), issetugid(2), setgid(2), setreuid(2), setuid(2)STANDARDS¶
Thegeteuid
() and
getuid
() system calls are expected to
conform to IEEE Std 1003.1-1990
(“POSIX.1”).
HISTORY¶
Thegetuid
() and
geteuid
() functions appeared in
Version 7 AT&T UNIX.June 4, 1993 | Debian |