GETOSRELDATE(3)        FreeBSD 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:

     https://www.FreeBSD.org/doc/en/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.

HISTORY
     The getosreldate() function appeared in FreeBSD 2.0.

FreeBSD 13.1-RELEASE-p6          June 13, 2018         FreeBSD 13.1-RELEASE-p6