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FreeBSD 11.0 - man page for getloginclass (freebsd section 2)

GETLOGINCLASS(2)					      BSD System Calls Manual						  GETLOGINCLASS(2)

NAME
getloginclass, setloginclass -- get/set login class
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h> int getloginclass(char *name, size_t len); int setloginclass(const char *name);
DESCRIPTION
The getloginclass() routine returns the login class name associated with the calling process, as previously set by setloginclass(). The caller must provide the buffer name with length len bytes to hold the result. The buffer should be at least MAXLOGNAME bytes in length. The setloginclass() system call sets the login class of the calling process to name. This system call is restricted to the super-user, and is normally used only when a new session is being created on behalf of the named user (for example, at login time, or when a remote shell is invoked). Processes inherit login class from their parents.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
The following errors may be returned by these calls: [EFAULT] The name argument gave an invalid address. [EINVAL] The name argument pointed to a string that was too long. Login class names are limited to MAXLOGNAME (from <sys/param.h>) characters, currently 17 including null. [EPERM] The caller tried to set the login class and was not the super-user. [ENAMETOOLONG] The size of the buffer is smaller than the result to be returned.
SEE ALSO
setusercontext(3)
HISTORY
The getloginclass() and setloginclass() system calls first appeared in FreeBSD 9.0.
BSD
March 6, 2011 BSD