can C language received information from Linux/Unix Post: 66303

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LEARN ABOUT LINUX

geteuid

GETUID(2)						     Linux Programmer's Manual							 GETUID(2)

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.

       When  a normal program is executed, the effective and real user ID of the process are set to the ID of the user executing the file.  When a
       set ID program is executed the real user ID is set to the calling user and the effective user ID corresponds to the set ID bit on the  file
       being executed.

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().

SEE ALSO

       getresuid(2), setreuid(2), setuid(2), credentials(7)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    1993-07-23								 GETUID(2)