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

getbootfile
get kernel boot file name

Standard C Library (libc, -lc)

#include <paths.h>

const char *
getbootfile(void);

The getbootfile() function retrieves the full pathname of the file from which the current kernel was loaded, and returns a static pointer to the name. A read/write interface to this information is available via the sysctl(3) MIB variable “kern.bootfile”.

If the call succeeds a string giving the pathname is returned. If it fails, a null pointer is returned and an error code is placed in the global location errno.

sysctl(3)

The getbootfile() function appeared in FreeBSD 2.0.

If the boot blocks have not been modified to pass this information into the kernel at boot time, the static string “/boot/kernel/kernel” is returned instead of the real boot file.
September 23, 1994 FreeBSD 13.1-RELEASE

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