• NAME
  
  getresuid, getresgid - get real, effective and saved user/group IDs
• SYNOPSIS
  
  #define _GNU_SOURCE
  #include <unistd.h>
  
  int getresuid(uid_t * ruid , uid_t * euid , uid_t * suid );
  int getresgid(gid_t * rgid , gid_t * egid , gid_t * sgid );
• DESCRIPTION
  
  getresuid () returns the real UID, the effective UID, and the saved set-user-ID of the calling process, in the arguments ruid , euid , and suid , respectively. getresgid () performs the analogous task for the process's group IDs.
• RETURN VALUE
  
  On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
• ERRORS
  

  EFAULT

  One of the arguments specified an address outside the calling program's address space.

• VERSIONS
  
  These system calls appeared on Linux starting with kernel 2.1.44.
  The prototypes are given by glibc since version 2.3.2, provided _GNU_SOURCE is defined.
• CONFORMING TO
  
  These calls are non-standard; they also appear on HP-UX and some of the BSDs.
• SEE ALSO
  
  getuid(2) , setresuid(2) , setreuid(2) , setuid(2) , credentials(7) , feature_test_macros(7)
• COLOPHON
  
  This page is part of release 3.19 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/.

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