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

getuid, geteuid - get user identity

#include <unistd.h>
#include <sys/types.h>

uid_t getuid(void);
uid_t geteuid(void);

getuid returns the real user ID of the current process.

geteuid returns the effective user ID of the current process.

The real ID corresponds to the ID of the calling process. The effective ID corresponds to the set ID bit on the file being executed.

These functions are always successful.

POSIX, BSD 4.3.

In Unix V6 the getuid() call returned (euid << 8) + uid. Unix V7 introduced separate calls getuid() and geteuid().

setreuid(2), setuid(2)

1993-07-23 Linux 0.99.11

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