PTHREAD_SETUGID_NP(2) BSD System Calls Manual PTHREAD_SETUGID_NP(2)NAMEpthread_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);
DESCRIPTIONpthread_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 creden‐
tial".
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.
ERRORSpthread_setugid_np() fails if one or more of the following are true:
[EPERM] The calling process does not have the correct creden‐
tials 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 ALSOsetuid(2)setgid(2)seteuid(2)setegid(2)BSD October 1, 2008 BSD
