BSD 2.11 - man page for setreuid (bsd section 2)
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setreuid - set real and effective user ID's
int ruid, euid;
The real and effective user ID's of the current process are set according to the argu-
ments. If ruid or euid is -1, the current uid is filled in by the system. Unprivileged
users may change the real user ID to the effective user ID and vice-versa; only the super-
user may make other changes.
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is
returned and errno is set to indicate the error.
[EPERM] The current process is not the super-user and a change other than changing
the effective user-id to the real user-id was specified.
getuid(2), setregid(2), setuid(3)
4th Berkeley Distribution May 9, 1985 SETREUID(2)
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