getloginclass(2) [freebsd man page]

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

GETLOGIN(2)						      BSD System Calls Manual						       GETLOGIN(2)

NAME

     getlogin, setlogin -- get/set login name

SYNOPSIS

     #include <unistd.h>

     char *
     getlogin(void);

     int
     setlogin(const char *name);

DESCRIPTION

     The getlogin() routine returns the login name of the user associated with the current session, as previously set by setlogin().  The name is
     normally associated with a login shell at the time a session is created, and is inherited by all processes descended from the login shell.
     (This is true even if some of those processes assume another user ID, for example when su(1) is used.)

     setlogin() sets the login name of the user associated with the current session to name.  This 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).

RETURN VALUES

     If a call to getlogin() succeeds, it returns a pointer to a null-terminated string in a static buffer.  If the name has not been set, it
     returns NULL.  If a call to setlogin() succeeds, a value of 0 is returned.  If setlogin() fails, a value of -1 is returned and an error code
     is placed in the global location errno.

ERRORS

     The following errors may be returned by these calls:

     [EFAULT]		The name parameter gave an invalid address.

     [EINVAL]		The name parameter pointed to a string that was too long.  Login names are limited to MAXLOGNAME (from <sys/param.h>)
			characters, currently 12.

     [EPERM]		The caller tried to set the login name and was not the super-user.

SEE ALSO

     setsid(2)

BUGS

     Login names are limited in length by setlogin().  However, lower limits are placed on login names elsewhere in the system (UT_NAMESIZE in
     <utmp.h>).

     In earlier versions of the system, getlogin() failed unless the process was associated with a login terminal.  The current implementation
     (using setlogin()) allows getlogin to succeed even when the process has no controlling terminal.  In earlier versions of the system, the
     value returned by getlogin() could not be trusted without checking the user ID.  Portable programs should probably still make this check.

HISTORY

     The getlogin() function first appeared in 4.4BSD.

4.2 Berkeley Distribution					   June 9, 1993 					 4.2 Berkeley Distribution