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Minix/CD-ROM-2.0/MINIX/MANUALS/CAT2/SETUID.2

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+SETUID(2)                 Minix Programmer's Manual                  SETUID(2)
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+NAME
+     setuid, setgid - set user or group ID's
+
+SYNOPSIS
+     #include <sys/types.h>
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+     int setuid(uid_t uid)
+     int setgid(gid_t gid)
+
+DESCRIPTION
+     Setuid sets the real and effective user ID's of the  current  process  to
+     uid.   Unprivileged users may only change both user ID's to the real user
+     ID; only the super-user may make other changes.  Setgid does the same for
+     the real and effective group ID's.
+
+     Minix-vmd allows an unprivileged user to change ID's to the original real
+     or  effective  ID  as  they  were  at  the time the process was executed.
+     Setgid may also set the group ID's to any of the additional  group  ID's.
+     If one of the remembered user ID's was 0 then any user or group ID may be
+     chosen.
+
+RETURN VALUE
+     Upon successful completion, a value of 0 is returned.  Otherwise, a value
+     of -1 is returned and errno is set to indicate the error.
+
+ERRORS
+
+     [EPERM]        The current process is not the  super-user  and  a  change
+                    other than one of the allowed changes was attempted.
+
+SEE ALSO
+     getuid(2), getgid(2).
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+4BSD                               May 9, 1985                               1
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