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Almost all UNIX operating systems have voluminous documentation known as manual pages. Every page is a document. If one wants to read a page then the command man at a shell prompt will show the manual, for example, "man ftp". Pages are referred by using the notation "name(manual-section)", for example time(1).

Man Page :: Unix Man Pages - geteuid

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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, 4.3BSD.

NOTES

History

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