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/* ISC license. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <fcntl.h>
#include <errno.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <skalibs/socket.h>
#include <skalibs/djbunix.h>
int mdevd_netlink_init (unsigned int group, unsigned int kbufsz)
{
struct sockaddr_nl nl = { .nl_family = AF_NETLINK, .nl_pad = 0, .nl_groups = group, .nl_pid = 0 } ;
int fd = socket_internal(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT, O_NONBLOCK|O_CLOEXEC) ;
if (fd < 0) return -1 ;
if (bind(fd, (struct sockaddr *)&nl, sizeof(struct sockaddr_nl)) < 0) goto err ;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &kbufsz, sizeof(unsigned int)) < 0)
{
if (errno != EPERM
|| setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &kbufsz, sizeof(unsigned int)) < 0) goto err ;
}
return fd ;
err:
fd_close(fd) ;
return -1 ;
}
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