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       setresuid, setresgid - set real, effective and saved user or group ID


       #define _GNU_SOURCE
       #include <unistd.h>

       int setresuid(uid_t ruid, uid_t euid, uid_t suid);
       int setresgid(gid_t rgid, gid_t egid, gid_t sgid);


       setresuid() sets the real user ID, the effective user ID, and the saved
       set-user-ID of the current process.

       Unprivileged user processes may change the real UID, effective UID, and
       saved  set-user-ID,  each  to one of: the current real UID, the current
       effective UID or the current saved set-user-ID.

       Privileged processes (on Linux, those having the CAP_SETUID capability)
       may set the real UID, effective UID, and saved set-user-ID to arbitrary

       If one of the parameters equals -1,  the  corresponding  value  is  not

       Regardless of what changes are made to the real UID, effective UID, and
       saved set-user-ID, the file system UID is always set to the same  value
       as the (possibly new) effective UID.

       Completely  analogously,  setresgid() sets the real GID, effective GID,
       and saved set-group-ID of the current process (and always modifies  the
       file  system  GID  to  be the same as the effective GID), with the same
       restrictions for non-privileged processes.


       On success, zero is returned.  On error, -1 is returned, and  errno  is
       set appropriately.


       EAGAIN uid  does  not  match  the current UID and this call would bring
              that user ID over its NPROC rlimit.

       EPERM  The  calling  process  is  not  privileged  (did  not  have  the
              CAP_SETUID  capability)  and  tried  to change the IDs to values
              that are not permitted.


       This call is nonstandard.


       This system call was first introduced in HP-UX.  It is available  under
       Linux  since Linux 2.1.44.  These days it is also found in FreeBSD (for
       emulation of Linux binaries).


       Under HP-UX and FreeBSD the prototype is found  in  <unistd.h>.   Under
       Linux  the  prototype  is  given  by glibc since version 2.3.2 provided
       _GNU_SOURCE is defined.


       getresuid(2),   getuid(2),   setfsuid(2),   setfsgid(2),   setreuid(2),
       setuid(2), capabilities(7)