geteuid man page on DigitalUNIX

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getuid(2)							     getuid(2)

       getuid, geteuid - Get the real or effective user ID

       #include <unistd.h>

       uid_t getuid(
	       void ); uid_t geteuid(
	       void );

       [Tru64  UNIX]	Application developers may want to specify an #include
       statement for <sys/types.h> before the one for <unistd.h>  if  programs
       are  being  develped  for  multiple  platforms. The additional #include
       statement is not required on Tru64 UNIX systems or by ISO or Open Group
       standards,  but	may be required on other vendors' systems that conform
       to these standards.

       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       getuid(), geteuid():  POSIX.1, XSH4.0, XSH4.2, XSH5.0

       Refer to standards(5) for more information about industry standards and
       associated tags.

       The getuid() function returns the real user ID of the calling process.

       The geteuid() function returns the effective user  ID  of  the  calling

       These  functions are always successful, and no return value is reserved
       to indicate an error.

       Functions: setreuid(2), setruid(3), setuid(2)

       Standards: standards(5)


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