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setreuid(2) System Calls Manual setreuid(2) NAME setreuid - Sets real and effective user IDs SYNOPSIS #include <unistd.h> setreuid( uid_t ruid, uid_t euid ); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: setreuid: XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the new real user ID. Specifies the new effective user ID. DESCRIPTION The setreuid() function sets the real and effective user IDs of the current process to the values specified by the ruid and euid parame- ters. If ruid or euid is -1, the corresponding effective or real user ID of the current process is not changed. Users may change the effective user ID to the real user ID; only processes with superuser privilege may make other changes. This task is normally done by the system's authentication program (for example, login), but is not done for system daemons. RETURN VALUES Upon successful completion, a value of 0 (zero) is returned. Other- wise, a value of -1 is returned and errno is set to indicate the error. ERRORS The setreuid() function sets errno to the specified values for the fol- lowing conditions: The value of the ruid or euid parameter is invalid or out of range. The current process is not the superuser and a change other than changing the effective user ID to the real user ID was spec- ified. RELATED INFORMATION Functions: getuid(2), setgid(2), setregid(2), setruid(3) Standards: standards(5) delim off setreuid(2)