geteuid(2) -- Linux man page
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 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.
ERRORS
These functions are always successful.
CONFORMING TO
POSIX, BSD 4.3.
SEE ALSO
setreuid(2),
setuid(2)
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