#include <sys/socket.h>
+#include <limits.h>
+#include <string.h>
+#include <errno.h>
#include "syscall.h"
-#include "libc.h"
ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
{
- ssize_t r;
- CANCELPT_BEGIN;
- r = socketcall(sendmsg, fd, msg, flags, 0, 0, 0);
- CANCELPT_END;
- return r;
+#if LONG_MAX > INT_MAX
+ struct msghdr h;
+ /* Kernels before 2.6.38 set SCM_MAX_FD to 255, allocate enough
+ * space to support an SCM_RIGHTS ancillary message with 255 fds.
+ * Kernels since 2.6.38 set SCM_MAX_FD to 253. */
+ struct cmsghdr chbuf[CMSG_SPACE(255*sizeof(int))/sizeof(struct cmsghdr)+1], *c;
+ if (msg) {
+ h = *msg;
+ h.__pad1 = h.__pad2 = 0;
+ msg = &h;
+ if (h.msg_controllen) {
+ if (h.msg_controllen > sizeof chbuf) {
+ errno = ENOMEM;
+ return -1;
+ }
+ memcpy(chbuf, h.msg_control, h.msg_controllen);
+ h.msg_control = chbuf;
+ for (c=CMSG_FIRSTHDR(&h); c; c=CMSG_NXTHDR(&h,c))
+ c->__pad1 = 0;
+ }
+ }
+#endif
+ return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0);
}