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FreeBSD 11.0 - man page for getosreldate (freebsd section 3)

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

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