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OpenDarwin 7.2.1 - man page for getuid (opendarwin section 2)

GETUID(2)				       BSD System Calls Manual					    GETUID(2)

NAME
getuid, geteuid -- get user identification
SYNOPSIS
#include <sys/types.h> #include <unistd.h> uid_t getuid(void); uid_t geteuid(void);
DESCRIPTION
The getuid() function returns the real user ID of the calling process. The geteuid() function returns the effective user ID of the calling process. The real user ID is that of the user who has invoked the program. As the effective user ID gives the process additional permissions during execution of ``set-user-ID'' mode processes, getuid() is used to determine the real-user-id of the calling process.
ERRORS
The getuid() and geteuid() functions are always successful, and no return value is reserved to indicate an error.
SEE ALSO
getgid(2), setreuid(2)
STANDARDS
Geteuid() and getuid() functions conform to IEEE Std 1003.1-1988 (``POSIX.1''). 4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution


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