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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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getuid(2) System Calls Manual getuid(2)
getuid, geteuid - get user identity
Standard C library (libc, -lc)
#include <unistd.h>
uid_t getuid(void);
uid_t geteuid(void);
getuid() returns the real user ID of the calling process.
geteuid() returns the effective user ID of the calling process.
These functions are always successful and never modify errno.
POSIX.1-2008.
POSIX.1-2001, 4.3BSD.
In UNIX V6 the getuid() call returned (euid << 8) + uid. UNIX V7
introduced separate calls getuid() and geteuid().
The original Linux getuid() and geteuid() system calls supported
only 16-bit user IDs. Subsequently, Linux 2.4 added getuid32()
and geteuid32(), supporting 32-bit IDs. The glibc getuid() and
geteuid() wrapper functions transparently deal with the
variations across kernel versions.
On Alpha, instead of a pair of getuid() and geteuid() system
calls, a single getxuid() system call is provided, which returns
a pair of real and effective UIDs. The glibc getuid() and
geteuid() wrapper functions transparently deal with this. See
syscall(2) for details regarding register mapping.
getresuid(2), setreuid(2), setuid(2), credentials(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
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for this manual page, see
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2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
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Linux man-pages 6.9.1 2024-05-02 getuid(2)
Pages that refer to this page: groups(1@@shadow-utils), homectl(1), importctl(1), journalctl(1), localectl(1), loginctl(1), machinectl(1), portablectl(1), ps(1), strace(1), systemctl(1), systemd(1), systemd-analyze(1), systemd-inhibit(1), systemd-nspawn(1), systemd-vmspawn(1), timedatectl(1), userdbctl(1), getresuid(2), seteuid(2), setpgid(2), setresuid(2), setreuid(2), setuid(2), syscalls(2), getlogin(3), id_t(3type), pam_close_session(3), pam_open_session(3), sysexits.h(3head), credentials(7), signal-safety(7), user_namespaces(7), systemd-tmpfiles(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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