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

modstat
get status of kernel module

Standard C Library (libc, -lc)

#include <sys/param.h>
#include <sys/module.h>
int
modstat(int modid, struct module_stat *stat);

The modstat() system call writes the info for the kernel module referred to by modid into stat.
struct module_stat { 
	int         version;        /* set to sizeof(module_stat) */ 
	char        name[MAXMODNAME]; 
	int         refs; 
	int         id; 
	modspecific_t data; 
}; 
typedef union modspecific { 
	int         intval; 
	u_int       uintval; 
	long        longval; 
	u_long      ulongval; 
} modspecific_t;
version
This field is set to the size of the structure mentioned above by the code calling modstat(), and not modstat() itself.
name
The name of the module referred to by modid.
refs
The number of modules referenced by modid.
id
The id of the module specified in modid.
data
Module specific data.

The modstat() 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 module referred to by modid is filled into the structure pointed to by stat unless:
[]
The module 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), kldstat(2), kldsym(2), kldunload(2), modfind(2), modfnext(2), modnext(2), kld(4), kldstat(8)

The kld interface first appeared in FreeBSD 3.0.
July 15, 2008 FreeBSD 12.0-RELEASE

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