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Man Pages
KLDSTAT(2) FreeBSD System Calls Manual KLDSTAT(2)

kldstat
get status of kld file

Standard C Library (libc, -lc)

#include <sys/param.h>
#include <sys/linker.h>
int
kldstat(int fileid, struct kld_file_stat *stat);

The kldstat() system call writes the info for the file referred to by fileid into stat.
struct kld_file_stat { 
	int         version;    /* set to sizeof(struct kld_file_stat) */ 
	char        name[MAXPATHLEN]; 
	int         refs; 
	int         id; 
	caddr_t     address; 
	size_t      size; 
	char        pathname[MAXPATHLEN]; 
};
version
This field is set to the size of the structure mentioned above by the code calling kldstat(), and not kldstat() itself.
name
The name of the file referred to by fileid.
refs
The number of modules referenced by fileid.
id
The id of the file specified in fileid.
address
The load address of the kld file.
size
The amount of memory in bytes allocated by the file.
pathname
The full name of the file referred to by fileid, including the path.

The kldstat() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

The information for the file referred to by fileid is filled into the structure pointed to by stat unless:
[]
The file was not found (probably not loaded).
[]
The version specified in the version field of stat is not the proper version. You would need to rebuild world, the kernel, or your application, if this error occurs, given that you did properly fill in the version field.
[]
There was a problem copying one, some, or all of the fields into stat in the copyout(9) function.

kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldsym(2), kldunload(2), modfind(2), modfnext(2), modnext(2), modstat(2), kld(4), kldstat(8)

The kld interface first appeared in FreeBSD 3.0.

The pathname may not be accurate if the file system mounts have changed since the module was loaded, or if this function is called within a chrooted environment.
March 28, 2012 FreeBSD 12.0-RELEASE

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