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OpenSolaris 2009.06 - man page for geteuid (opensolaris section 2)

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getuid(2)				   System Calls 				getuid(2)

       getuid,	geteuid,  getgid, getegid - get real user, effective user, real group, and effec-
       tive group IDs

       #include <sys/types.h>
       #include <unistd.h>

       uid_t getuid(void);

       uid_t geteuid(void);

       gid_t getgid(void);

       gid_t getegid(void);

       The getuid() function returns the real user ID of the calling process. The  real  user  ID
       identifies the person who is logged in.

       The geteuid() function returns the effective user ID of the calling process. The effective
       user ID gives the process various permissions during execution of "set-user-ID" mode  pro-
       cesses which use  getuid() to determine the real user ID of the process that invoked them.

       The getgid() function returns the real group ID of the calling process.

       The getegid() function returns the effective group ID of the calling process.

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Interface Stability	     |Standard			   |
       |MT-Level		     |Async-Signal-Safe 	   |

       Intro(2), setuid(2), attributes(5), standards(5)

SunOS 5.11				   28 Dec 1996					getuid(2)
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