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(freebsd section 2)
man page for modfnext

MODNEXT(2)						      BSD System Calls Manual							MODNEXT(2)

NAME
modnext -- return the modid of the next kernel module LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/param.h> #include <sys/module.h> int modnext(int modid); int modfnext(int modid); DESCRIPTION
The modnext() system call returns the modid of the next kernel module (that is, the one after modid) or 0 if modid is the last module in the list. If the modid value is 0, then modnext() will return the modid of the first module. The modfnext() system call must always be given a valid modid. RETURN VALUES
The modnext() system call returns the modid of the next module (see DESCRIPTION) or 0. If an error occurs, errno is set to indicate the error. ERRORS
The only error set by modnext() is ENOENT, which is set when modid refers to a kernel module that does not exist (is not loaded). SEE ALSO
kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldstat(2), kldsym(2), kldunload(2), modfind(2), modstat(2), kld(4), kldstat(8) HISTORY
The kld interface first appeared in FreeBSD 3.0. BSD
September 28, 2000 BSD

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