getuid - Online Linux Manual PageSection : 2
Updated : 2022-10-30
Source : Linux man-pages 6.03

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NAMEgetuid, geteuid − get user identity

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#include <unistd.h>uid_t getuid(void); uid_t geteuid(void);

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DESCRIPTIONgetuid() returns the real user ID of the calling process. geteuid() returns the effective user ID of the calling process.

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ERRORSThese functions are always successful and never modify errno.

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STANDARDSPOSIX.1-2001, POSIX.1-2008, 4.3BSD.

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NOTES

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HistoryIn 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.

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SEE ALSOgetresuid(2), setreuid(2), setuid(2), credentials(7) 0

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