1#include <sys/socket.h>
 2#include <limits.h>
 3#include <string.h>
 4#include <errno.h>
 5#include "syscall.h"
 6
 7ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
 8{
 9#if LONG_MAX > INT_MAX
10	struct msghdr h;
11	/* Kernels before 2.6.38 set SCM_MAX_FD to 255, allocate enough
12	 * space to support an SCM_RIGHTS ancillary message with 255 fds.
13	 * Kernels since 2.6.38 set SCM_MAX_FD to 253. */
14	struct cmsghdr chbuf[CMSG_SPACE(255*sizeof(int))/sizeof(struct cmsghdr)+1], *c;
15	if (msg) {
16		h = *msg;
17		h.__pad1 = h.__pad2 = 0;
18		msg = &h;
19		if (h.msg_controllen) {
20			if (h.msg_controllen > sizeof chbuf) {
21				errno = ENOMEM;
22				return -1;
23			}
24			memcpy(chbuf, h.msg_control, h.msg_controllen);
25			h.msg_control = chbuf;
26			for (c=CMSG_FIRSTHDR(&h); c; c=CMSG_NXTHDR(&h,c))
27				c->__pad1 = 0;
28		}
29	}
30#endif
31	return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0);
32}