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28 .\" @(#)setuid.2 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/sys/setuid.2,v 1.13.2.7 2003/02/14 00:49:42 keramida Exp $
30 .\" $DragonFly: src/lib/libc/sys/setuid.2,v 1.2 2003/06/17 04:26:47 dillon Exp $
40 .Nd set user and group ID
47 .Fn setuid "uid_t uid"
49 .Fn seteuid "uid_t euid"
51 .Fn setgid "gid_t gid"
53 .Fn setegid "gid_t egid"
58 sets the real and effective
59 user IDs and the saved set-user-ID of the current process
60 to the specified value.
61 .\" Comment out next block for !_POSIX_SAVED_IDS
62 .\" The real user ID and the saved set-user-ID are changed only if the
63 .\" effective user ID is that of the super user.
66 .\" function is equal to
68 .\" function if the effective user ID is not that of the super user.
72 function is permitted if the specified ID is equal to the real user ID
73 .\" Comment out next line for !_POSIX_SAVED_IDS
74 .\" or the saved set-user-ID
75 .\" Next line is for Appendix B.4.2.2 case.
76 or the effective user ID
77 of the process, or if the effective user ID is that of the super user.
82 sets the real and effective
83 group IDs and the saved set-group-ID of the current process
84 to the specified value.
85 .\" Comment out next block for !_POSIX_SAVED_IDS
86 .\" The real group ID and the saved set-group-ID are changed only if the
87 .\" effective user ID is that of the super user.
90 .\" function is equal to
92 .\" function if the effective user ID is not that of the super user.
96 function is permitted if the specified ID is equal to the real group ID
97 .\" Comment out next line for !_POSIX_SAVED_IDS
98 .\" or the saved set-group-ID
99 .\" Next line is for Appendix B.4.2.2 case.
100 or the effective group ID
101 of the process, or if the effective user ID is that of the super user.
107 sets the effective user ID (group ID) of the
109 The effective user ID may be set to the value
110 of the real user ID or the saved set-user-ID (see
114 in this way, the effective user ID of a set-user-ID executable
115 may be toggled by switching to the real user ID, then re-enabled
116 by reverting to the set-user-ID value.
117 Similarly, the effective group ID may be set to the value
118 of the real group ID or the saved set-group-ID.
122 The functions will fail if:
125 The user is not the super user and the ID
126 specified is not the real, effective ID, or saved ID.
139 functions are compliant with the
143 .\" Uncomment next line for !_POSIX_SAVED_IDS
145 defined with the permitted extensions from Appendix B.4.2.2.
150 functions are extensions based on the
153 .Li _POSIX_SAVED_IDS ,
154 and have been proposed for a future revision of the standard.
160 function calls appeared in