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$FreeBSD$
.Dd September 30, 2008 .Dt GETOSRELDATE 3 .Os .Sh NAME .Nm getosreldate .Nd get the value of .Dv __FreeBSD_version .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft int .Fn getosreldate void .Sh DESCRIPTION The .Fn getosreldate function returns an integer showing the version of the currently running .Fx kernel. Definitions of the values can be found in .%B "The Porter's Handbook" which is usually installed at
a /usr/share/doc/en_US.ISO8859-1/books/porters-handbook/ . .Sh RETURN VALUES Upon successful completion, .Fn getosreldate returns the value requested; otherwise the value -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ENVIRONMENT l -tag -width ".Ev OSVERSION" t Ev OSVERSION If the environment variable .Ev OSVERSION is set, it will override the .Fn getosreldate return value. .El .Sh EXAMPLES An example can be found in
a /usr/share/examples/FreeBSD_version . .Sh ERRORS The .Fn getosreldate function may fail and set .Va errno for any of the errors specified for the library function .Xr sysctl 3 . .Sh SEE ALSO .Rs .%B "The Porter's Handbook" .%O /usr/share/doc/en_US.ISO8859-1/books/porters-handbook/ .Re .Sh HISTORY The .Fn getosreldate function appeared in .Fx 2.0 .