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RedHat 9 (Linux i386) - man page for setresuid (redhat section 2)

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SETRESUID(2)			    Linux Programmer's Manual			     SETRESUID(2)

       setresuid, setresgid - set real, effective and saved user or group ID

       #include <unistd.h>

       int setresuid(uid_t ruid, uid_t euid, uid_t suid);
       int setresgid(gid_t rgid, gid_t egid, gid_t sgid);

       setresuid  sets	the real user ID, the effective user ID, and the saved set-user-ID of the
       current process.

       Unprivileged user processes (i.e., processes with each of real, effective and  saved  user
       ID  nonzero) may change the real, effective and saved user ID, each to one of: the current
       uid, the current effective uid or the current saved uid.

       The super-user may set real, effective and saved user ID to arbitrary values.

       If one of the parameters equals -1, the corresponding value is not changed.

       Completely analogously, setresgid sets the real, effective and saved  group  ID's  of  the
       current process, with the same restrictions for processes with each of real, effective and
       saved user ID nonzero.

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

       EPERM  The current process was not privileged and tried to change the IDs is a not allowed

       This call is nonstandard.

       This  system  call was first introduced in HP-UX.  It is available under Linux since Linux
       2.1.44.	These days it is also found in FreeBSD (for emulation of Linux binaries).

       Under HP-UX and FreeBSD the prototype is found in <unistd.h>.  Under Linux there is so far
       no  include  file  giving  the prototype - this is a glibc bug. Programs using this system
       call must add the prototype themselves.

       getuid(2), setuid(2), setreuid(2), getresuid(2)

Linux 2.1.44				    2001-11-15				     SETRESUID(2)
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