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DO_SETRESUID(9)          BSD Kernel Developer's Manual         DO_SETRESUID(9)

     do_setresuid, do_setresgid -- set process uid and gid

     #include <&lt;sys/ucred.h>&gt;

     do_setresuid(struct lwp *lwp, uid_t ruid, uid_t euid, uid_t svuid,
         u_int flags);

     do_setresgid(struct lwp *lwp, uid_t ruid, uid_t euid, uid_t svuid,
         u_int flags);

     The do_setresuid and do_setresgid functions are used to implement the
     various system calls that allow a process to change its real, effective,
     and saved uid and gid values.

     The do_setresuid function sets the specified processes real user ID to
     ruid, its effective user ID to euid, and its saved user ID to svuid.  If
     any of the uid arguments are -1 then that assignment is skipped.

     If suser() is true, then any values may be assigned, otherwise the new
     uid values must match one of the existing values and the caller must have
     set the relevant bit in flags.

     The flags argument specifies which of the existing uid values the new
     value must match.  It should be set to a logical OR of
     ID_{R,E,S}_EQ_{R,E,S}, where ID_E_EQ_R means that is is valid to set the
     effective ID to the current value of the real ID.

     The do_setresgid function sets the group IDs but otherwise behaves in the
     same manner as do_setresuid.  The processes group list is neither exam-
     ined nor effected.

     setregid(2), setreuid(2), setuid(2), suser(9)

     These functions are implemented in: sys/kern/kern_prot.c.

     Implemented for NetBSD 2.0 to replace ad-hoc code in each system call
     routine and in the various compat modules.

BSD                           September 28, 2003                           BSD