freebsd man page for getosreldate

GETOSRELDATE(3) 					   BSD Library Functions Manual 					   GETOSRELDATE(3)

NAME
     getosreldate -- get the value of __FreeBSD_version

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     getosreldate(void);

DESCRIPTION
     The getosreldate() function returns an integer showing the version of the currently running FreeBSD kernel.  Definitions of the values can be
     found in The Porter's Handbook which is usually installed at /usr/share/doc/en_US.ISO8859-1/books/porters-handbook/.

RETURN VALUES
     Upon successful completion, getosreldate() returns the value requested; otherwise the value -1 is returned and the global variable errno is
     set to indicate the error.

ENVIRONMENT
     OSVERSION	If the environment variable OSVERSION is set, it will override the getosreldate() return value.

EXAMPLES
     An example can be found in /usr/share/examples/FreeBSD_version.

ERRORS
     The getosreldate() function may fail and set errno for any of the errors specified for the library function sysctl(3).

SEE ALSO
     The Porter's Handbook, /usr/share/doc/en_US.ISO8859-1/books/porters-handbook/.

HISTORY
     The getosreldate() function appeared in FreeBSD 2.0.

BSD
								September 30, 2008							       BSD