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32 .\" @(#)setuid.2 8.1 (Berkeley) 6/4/93
33 .\" $FreeBSD: src/lib/libc/sys/setuid.2,v 1.13.2.7 2003/02/14 00:49:42 keramida Exp $
43 .Nd set user and group ID
50 .Fn setuid "uid_t uid"
52 .Fn seteuid "uid_t euid"
54 .Fn setgid "gid_t gid"
56 .Fn setegid "gid_t egid"
61 sets the real and effective
62 user IDs and the saved set-user-ID of the current process
63 to the specified value.
64 .\" Comment out next block for !_POSIX_SAVED_IDS
65 .\" The real user ID and the saved set-user-ID are changed only if the
66 .\" effective user ID is that of the super user.
69 .\" function is equal to
71 .\" function if the effective user ID is not that of the super user.
75 function is permitted if the specified ID is equal to the real user ID
76 .\" Comment out next line for !_POSIX_SAVED_IDS
77 .\" or the saved set-user-ID
78 .\" Next line is for Appendix B.4.2.2 case.
79 or the effective user ID
80 of the process, or if the effective user ID is that of the super user.
85 sets the real and effective
86 group IDs and the saved set-group-ID of the current process
87 to the specified value.
88 .\" Comment out next block for !_POSIX_SAVED_IDS
89 .\" The real group ID and the saved set-group-ID are changed only if the
90 .\" effective user ID is that of the super user.
93 .\" function is equal to
95 .\" function if the effective user ID is not that of the super user.
99 function is permitted if the specified ID is equal to the real group ID
100 .\" Comment out next line for !_POSIX_SAVED_IDS
101 .\" or the saved set-group-ID
102 .\" Next line is for Appendix B.4.2.2 case.
103 or the effective group ID
104 of the process, or if the effective user ID is that of the super user.
110 sets the effective user ID (group ID) of the
112 The effective user ID may be set to the value
113 of the real user ID or the saved set-user-ID (see
117 in this way, the effective user ID of a set-user-ID executable
118 may be toggled by switching to the real user ID, then re-enabled
119 by reverting to the set-user-ID value.
120 Similarly, the effective group ID may be set to the value
121 of the real group ID or the saved set-group-ID.
125 The functions will fail if:
128 The user is not the super user and the ID
129 specified is not the real, effective ID, or saved ID.
142 functions are compliant with the
146 .\" Uncomment next line for !_POSIX_SAVED_IDS
148 defined with the permitted extensions from Appendix B.4.2.2.
153 functions are extensions based on the
156 .Li _POSIX_SAVED_IDS ,
157 and have been proposed for a future revision of the standard.
163 function calls appeared in