Workaround a SunOS bug with reading more than 2^31 bytes of data.

diff --git a/bpf.c b/bpf.c
index 360b677d1ffcf60e99dbab09a11808c73f404885..43e7dad64d4380bbbea5f63c93a309f00be70c4b 100644 (file)
--- a/bpf.c
+++ b/bpf.c
@@ -204,6 +204,14 @@ bpf_read(struct interface *ifp, int fd, void *data, size_t len, int *flags)
        for (;;) {
                if (state->buffer_len == 0) {
                        bytes = read(fd, state->buffer, state->buffer_size);
+#if defined(__sun)
+                       /* After 2^31 bytes, the kernel offset overflows.
+                        * To work around this bug, lseek 0. */
+                       if (bytes == -1 && errno == EINVAL) {
+                               lseek(fd, 0, SEEK_SET);
+                               continue;
+                       }
+#endif
                        if (bytes == -1 || bytes == 0)
                                return bytes;
                        state->buffer_len = (size_t)bytes;
@@ -413,6 +421,7 @@ bpf_arp(struct interface *ifp, int fd)
 
        if (fd == -1)
                return 0;
+
        bp = bpf;
        /* Check frame header. */
        switch(ifp->family) {