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Man Pages
GETOSRELDATE(3) FreeBSD Library Functions Manual GETOSRELDATE(3)

getosreldate
get the value of __FreeBSD_version

Standard C Library (libc, -lc)

#include <unistd.h>

int
getosreldate(void);

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/

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.

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

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

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

The Porter's Handbook.

The getosreldate() function appeared in FreeBSD 2.0.
June 13, 2018 FreeBSD 13.1-RELEASE

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