GETRESUIDSection: Linux Programmer's Manual (2)
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NAMEgetresuid, getresgid - get real, effective and saved user or group ID
DESCRIPTIONgetresuid() and getresgid() (both introduced in Linux 2.1.44) get the real UID, effective UID, and saved set-user-ID (resp. group ID's) of the current process.
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
- One of the arguments specified an address outside the calling program's address space.
CONFORMING TOThese calls are non-standard; they also appear on HP-UX and some of the BSDs.
SEE ALSOgetuid(2), setresuid(2), setreuid(2), setuid(2), feature_test_macros(7)