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Linux and UNIX Man Pages

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Linux 2.6 - man page for getuid (linux section 2)

GETUID(2)						     Linux Programmer's Manual							 GETUID(2)

NAME
getuid, geteuid - get user identity
SYNOPSIS
#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 ker- nel 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.
SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7) Linux 2019-03-06 GETUID(2)

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