SETRESUID - phpMan

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



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

SYNOPSIS
       #define _GNU_SOURCE
       #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);

DESCRIPTION
       setresuid  sets  the real user ID, the effective user ID, and the saved (effective)
       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.


RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropri-
       ately.

ERRORS
       EPERM  The current process was not privileged (did not have the CAP_SETUID capabil-
              ity) and tried to change the IDs is a not allowed way.

       EAGAIN uid does not match the current uid and this call  would  bring  that  userID
              over its NPROC rlimit.

CONFORMING TO
       This call is nonstandard.

HISTORY
       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 bina-
       ries).

NOTES
       Under HP-UX and FreeBSD the prototype is found in <unistd.h>.  Under Linux the pro-
       totype is given by glibc since version 2.3.2 provided _GNU_SOURCE is defined.

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



Linux 2.4                         2003-05-26                      SETRESUID(2)

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