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GETUID
Section: Linux Programmer's Manual (2)Updated: 2017-09-15
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NAME
getuid, geteuid - get user identitySYNOPSIS
#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.
ERRORS
These functions are always successful.CONFORMING TO
POSIX.1-2001, POSIX.1-2008, 4.3BSD.NOTES
History
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.
SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7)COLOPHON
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