Name
setresuid, setresgid — set real, effective and saved
user or group ID
Synopsis
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 set-user-ID of
the current process.
Unprivileged user processes may change the real UID,
effective UID, and saved set-user-ID, each to one of: the
current real UID, the current effective UID or the current
saved set-user-ID.
Privileged processes (on Linux, those having the
CAP_SETUID capability) may set the real UID, effective UID,
and saved set-user-ID to arbitrary values.
If one of the parameters equals −1, the
corresponding value is not changed.
Regardless of what changes are made to the real UID,
effective UID, and saved set-user-ID, the file system UID is
always set to the same value as the (possibly new) effective
UID.
Completely analogously, setresgid() sets the real GID, effective
GID, and saved set-group-ID of the current process (and
always modifies the file system GID to be the same as the
effective GID), with the same restrictions for non-privileged
processes.
RETURN VALUE
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
ERRORS
- EAGAIN
-
uid does
not match the current UID and this call would bring
that user ID over its NPROC rlimit.
- EPERM
-
The calling process is not privileged (did not have
the CAP_SETUID capability) and tried to change the IDs
to values that are not permitted.
VERSIONS
These calls are available under Linux since Linux
2.1.44.
CONFORMING TO
These calls are non-standard; they also appear on HP-UX
and some of the BSDs.
NOTES
Under HP-UX and FreeBSD the prototype is found in
<unistd.h>.
Under Linux the prototype is given by glibc since version
2.3.2 provided _GNU_SOURCE is defined.
SEE ALSO
getresuid(2), getuid(2), setfsuid(2), setfsgid(2), setreuid(2), setuid(2), capabilities(7), credentials(7), feature_test_macros(7)
Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
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Modified, 2003-05-26, Michael Kerrisk, <mtk-manpages@gmx.net>
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