geteuid(2) - NetBSD Manual Pages

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GETUID(2)                 NetBSD System Calls Manual                 GETUID(2)


NAME

     getuid, geteuid -- get user identification


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #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 execu-
     tion 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

     The geteuid() and getuid() functions conform to ISO/IEC 9945-1:1990
     (``POSIX.1'').


HISTORY

     The getuid() function appeared in Version 1 AT&T UNIX.

NetBSD 10.1                    September 1, 2019                   NetBSD 10.1