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authorpaul <paul>2005-05-03 09:07:56 +0000
committerpaul <paul>2005-05-03 09:07:56 +0000
commit0dab930314e215a627f848ffa824ed995eb2e13c (patch)
treef84189f12990561a616c65be59d8cb6ebef94569
parent0c2029e9121d4c80380c174c2503b7deaf4e03ce (diff)
2005-05-03 Paul Jakma <paul@dishone.st>
* stream.h: Add comment about the special zero-ing ability of stream_put. (stream_recvmsg, stream_write) should return ssize_t and size_t respectively. Should both be extern linkage. (stream_recvfrom) Stream aware wrapper around recvfrom, in style of stream_read_try. * stream.c: (stream_recvfrom) new function, wrapper around recvfrom. (stream_recvmsg, stream_write) ssize_t and size_t return values
-rw-r--r--lib/ChangeLog11
-rw-r--r--lib/stream.c38
-rw-r--r--lib/stream.h15
3 files changed, 55 insertions, 9 deletions
diff --git a/lib/ChangeLog b/lib/ChangeLog
index 8da9870e..fb5b1309 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,14 @@
+2005-05-03 Paul Jakma <paul@dishone.st>
+
+ * stream.h: Add comment about the special zero-ing ability of
+ stream_put.
+ (stream_recvmsg, stream_write) should return ssize_t and size_t
+ respectively. Should both be extern linkage.
+ (stream_recvfrom) Stream aware wrapper around recvfrom, in style
+ of stream_read_try.
+ * stream.c: (stream_recvfrom) new function, wrapper around recvfrom.
+ (stream_recvmsg, stream_write) ssize_t and size_t return values
+
2005-04-27 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
Add wall-clock timing statistics to 'show thread cpu' output.
diff --git a/lib/stream.c b/lib/stream.c
index b71b8ee9..d8c10882 100644
--- a/lib/stream.c
+++ b/lib/stream.c
@@ -368,6 +368,8 @@ stream_get_ipv4 (struct stream *s)
*
* XXX: This uses CHECK_SIZE and hence has funny semantics -> Size will wrap
* around. This should be fixed once the stream updates are working.
+ *
+ * stream_write() is saner
*/
void
stream_put (struct stream *s, void *src, size_t size)
@@ -630,12 +632,44 @@ stream_read_try(struct stream *s, int fd, size_t size)
return -1;
}
+/* Read up to size bytes into the stream from the fd, using recvmsgfrom
+ * whose arguments match the remaining arguments to this function
+ */
+ssize_t
+stream_recvfrom (struct stream *s, int fd, size_t size, int flags,
+ struct sockaddr *from, socklen_t *fromlen)
+{
+ ssize_t nbytes;
+
+ STREAM_VERIFY_SANE(s);
+
+ if (STREAM_WRITEABLE(s) < size)
+ {
+ STREAM_BOUND_WARN (s, "put");
+ /* Fatal (not transient) error, since retrying will not help
+ (stream is too small to contain the desired data). */
+ return -1;
+ }
+
+ if ((nbytes = recvfrom (fd, s->data + s->endp, size,
+ flags, from, fromlen)) >= 0)
+ {
+ s->endp += nbytes;
+ return nbytes;
+ }
+ /* Error: was it transient (return -2) or fatal (return -1)? */
+ if (ERRNO_IO_RETRY(errno))
+ return -2;
+ zlog_warn("%s: read failed on fd %d: %s", __func__, fd, safe_strerror(errno));
+ return -1;
+}
+
/* Read up to smaller of size or SIZE_REMAIN() bytes to the stream, starting
* from endp.
* First iovec will be used to receive the data.
* Stream need not be empty.
*/
-int
+ssize_t
stream_recvmsg (struct stream *s, int fd, struct msghdr *msgh, int flags,
size_t size)
{
@@ -666,7 +700,7 @@ stream_recvmsg (struct stream *s, int fd, struct msghdr *msgh, int flags,
}
/* Write data to buffer. */
-int
+size_t
stream_write (struct stream *s, u_char *ptr, size_t size)
{
diff --git a/lib/stream.h b/lib/stream.h
index 1f6c3772..7565fac8 100644
--- a/lib/stream.h
+++ b/lib/stream.h
@@ -86,10 +86,9 @@
* use stream_forward_endp() to effectively create arbitrary zero-fill
* padding. However, note that stream_reset() does *not* zero-out the
* stream. This property should **not** be relied upon.
- *
- * A Good stream user should ensure it writes all bytes. (the zero-fill
- * guarantee may be removed in future, however, the zero-filling may
- * possibly be moved to stream_forward_endp() instead, maybe..)
+ *
+ * Best practice is to use stream_put (<stream *>, NULL, <size>) to zero out
+ * any part of a stream which isn't otherwise written to.
*/
/* Stream buffer. */
@@ -143,7 +142,7 @@ void stream_set_getp (struct stream *, size_t);
void stream_forward_getp (struct stream *, size_t);
void stream_forward_endp (struct stream *, size_t);
-void stream_put (struct stream *, void *, size_t);
+void stream_put (struct stream *, void *, size_t); /* NULL source zeroes */
int stream_putc (struct stream *, u_char);
int stream_putc_at (struct stream *, size_t, u_char);
int stream_putw (struct stream *, u_int16_t);
@@ -184,9 +183,11 @@ int stream_read_unblock (struct stream *, int, size_t);
*/
extern ssize_t stream_read_try(struct stream *s, int fd, size_t size);
-int stream_recvmsg (struct stream *s, int fd, struct msghdr *,
+extern ssize_t stream_recvmsg (struct stream *s, int fd, struct msghdr *,
int flags, size_t size);
-int stream_write (struct stream *, u_char *, size_t);
+extern ssize_t stream_recvfrom (struct stream *s, int fd, size_t len, int flags,
+ struct sockaddr *from, socklen_t *fromlen);
+size_t stream_write (struct stream *, u_char *, size_t);
void stream_reset (struct stream *); /* reset the stream. See Note above */
int stream_flush (struct stream *, int);