pthread_setugid_np(2) [osx man page]

PTHREAD_SETUGID_NP(2)					      BSD System Calls Manual					     PTHREAD_SETUGID_NP(2)

NAME

     pthread_setugid_np -- Set the per-thread userid and single groupid.

SYNOPSIS

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

     int
     pthread_setugid_np(uid_t uid, gid_t gid);

DESCRIPTION

     pthread_setugid_np() changes the current thread's effective, real, and saved userid and groupid to the requested userid and groupid ( uid and
     gid , respectively) and clears all other groupids.

     uid can be the current real userid, KAUTH_UID_NONE, or, if the caller is privileged, any userid.  gid can be the current real groupid or, if
     the caller is priviledged, any single groupid.

     Setting uid to KAUTH_UID_NONE means to "revert to the per process credential".

CAVEATS

     Temporarily restoring root privileges for a non-privileged process is only possible on a per-process basis and not a per-thread basis.

     pthread_setugid_np() is not intended as a privilege escalation mechanism.

     Do not use pthread_setugid_np.2() in a security sensitive situation.

RETURN VALUES

     Upon successful completion, a value of 0 is returned.  Otherwise, -1 is returned and the global variable errno is set to indicate the error.

ERRORS

     pthread_setugid_np() fails if one or more of the following are true:

     [EPERM]		The calling process does not have the correct credentials to set the override identity (i.e. The current credentials do
			not imply "super-user").

     [EPERM]		If uid is set to KAUTH_UID_NONE, the current thread must already be assuming another identity in order to revert back.

     [EPERM]		The current thread cannot already be assuming another identity.

SEE ALSO

     setuid(2) setgid(2) seteuid(2) setegid(2)

BSD
								  October 1, 2008							       BSD

setuid(2)							   System Calls 							 setuid(2)

NAME

       setuid, setegid, seteuid, setgid - set user and group IDs

SYNOPSIS

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

       int setuid(uid_t uid);

       int setgid(gid_t gid);

       int seteuid(uid_t euid);

       int setegid(gid_t egid);

DESCRIPTION

       The  setuid()  function	sets the real user ID, effective user ID, and saved user ID of the calling process. The setgid() function sets the
       real group ID, effective group ID, and saved group ID of the calling process. The setegid() and seteuid() functions set the effective group
       and user IDs respectively for the calling process. See Intro(2) for more information on real, effective, and saved user and group IDs.

       At  login time, the real user ID, effective user ID, and saved user ID of the login process are set to the login ID of the user responsible
       for the creation of the process. The same is true for the real, effective, and saved group IDs; they are set to the group ID  of  the  user
       responsible for the creation of the process.

       When  a process calls one of the exec(2) family of functions to execute a file (program), the user and/or group identifiers associated with
       the process can change. If the file executed is a set-user-ID file, the effective and saved user IDs of the process are set to the owner of
       the  file  executed.  If the file executed is a set-group-ID file, the effective and saved group IDs of the process are set to the group of
       the file executed. If the file executed is not a set-user-ID or set-group-ID file, the effective user ID, saved user  ID,  effective  group
       ID, and saved group ID are not changed.

       If  the	{PRIV_PROC_SETID}  privilege is asserted in the effective set of the process calling setuid(), the real, effective, and saved user
       IDs are set to the uid argument.  If the uid argument is 0 and none of the saved, effective or  real  UID  is  0,  additional  restrictions
       apply. See privileges(5).

       If  the	{PRIV_PROC_SETID}  privilege  is not asserted in the effective set, but uid is either the real user ID or the saved user ID of the
       calling process, the effective user ID is set to uid.

       If the {PRIV_PROC_SETID} privilege is asserted in the effective set of the process calling setgid(), the real, effective, and  saved  group
       IDs are set to the gid argument.

       If  the	{PRIV_PROC_SETID} privilege is not asserted in the effective set, but gid is either the real group ID or the saved group ID of the
       calling process, the effective group ID is set to gid.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The setuid() and setgid() functions will fail if:

       EINVAL	 The value of uid or gid is out of range.

       EPERM	 For setuid() and seteuid(), the {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling process  and  the
		 uid  argument does not match either the real or saved user IDs, or an attempt is made to change to UID 0 and none of the existing
		 UIDs is 0, in which case additional privileges are required.

		 For setgid() and setegid(), the {PRIV_PROC_SETID} privilege is not asserted in the effective set and the gid  argument  does  not
		 match either the real or saved group IDs.

ATTRIBUTES

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

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

SEE ALSO

       Intro(2), exec(2), getgroups(2), getuid(2), stat.h(3HEAD), attributes(5), privileges(5), standards(5)

SunOS 5.11							    20 Jan 2003 							 setuid(2)