Manual Page - getuid(2)

Manual Reference Pages - GETUID (2)

getuid, geteuid - get user identity

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Description
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#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.

These functions are always successful.

POSIX.1-2001, 4.3BSD.

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