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BSD 2.11 - man page for setreuid (bsd section 2)

SETREUID(2)					 System Calls Manual					  SETREUID(2)

NAME
setreuid - set real and effective user ID's
SYNOPSIS
setreuid(ruid, euid) int ruid, euid;
DESCRIPTION
The real and effective user ID's of the current process are set according to the arguments. 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.
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
[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.
SEE ALSO
getuid(2), setregid(2), setuid(3) 4th Berkeley Distribution May 9, 1985 SETREUID(2)


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