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

       seteuid, setegid - set effective user or group ID

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

       int seteuid(uid_t euid);
       int setegid(gid_t egid);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       seteuid(), setegid(): _BSD_SOURCE || _POSIX_C_SOURCE >= 200112L ||
       _XOPEN_SOURCE >= 600

       seteuid() sets the effective user ID of the calling process.   Unprivi‐
       leged  user  processes  may  only set the effective user ID to the real
       user ID, the effective user ID or the saved set-user-ID.

       Precisely the same holds for setegid() with "group" instead of "user".

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

       EPERM  The  calling process is not privileged (Linux: does not have the
	      CAP_SETUID capability in the case of seteuid(), or the  CAP_SET‐
	      GID capability in the case of setegid()) and euid (respectively,
	      egid) is not the	real  user  (group)  ID,  the  effective  user
	      (group) ID, or the saved set-user-ID (saved set-group-ID).

       4.3BSD, POSIX.1-2001.

       Setting	the  effective user (group) ID to the saved set-user-ID (saved
       set-group-ID) is possible since Linux 1.1.37 (1.1.38).  On an arbitrary
       system one should check _POSIX_SAVED_IDS.

       Under  libc4,  libc5  and  glibc	 2.0  seteuid(euid)  is	 equivalent to
       setreuid(-1, euid) and hence may change the saved  set-user-ID.	 Under
       glibc  2.1  and	later  it is equivalent to setresuid(-1, euid, -1) and
       hence does not change the saved set-user-ID.  Similar remarks hold  for

       geteuid(2), setresuid(2), setreuid(2), setuid(2), capabilities(7), cre‐

       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2007-07-26			    SETEUID(2)

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