[SCM] Samba Shared Repository - branch master updated
Jeremy Allison
jra at samba.org
Fri Apr 19 17:05:03 MDT 2013
The branch, master has been updated
via 95f7fc8 Ensure the RECVFILE path in vfs_pwrite_data() operates on a blocking socket.
via 1ed710c Ensure the RECVFILE path in vfs_write_data() operates on a blocking socket.
via 1b46db7 Ensure drain_socket() operates on a blocking socket.
via 1a7cec3 Add the internals of is_smb2_recvfile_write.
via 53b87f2 The guts of the receivefile code changes.
via fdcaf0f Add stub static function that will turn on/off receivefile code path.
via 4b91097 Add extra fields into struct smbd_smb2_request_read_state to support receivefile.
via 36d4b9d Add macro SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN.
via 61da7f0 Add utility function get_min_receive_file_size().
via 6373944 Allow smbd_smb2_request_error_ex() to cope with unread bytes on error.
via a36d763 Add function smbd_smb2_unread_bytes().
via ec9fc98 If we already have an smb1req attached to the struct smbd_smb2_request, don't recreate it.
via 9791c1a Ensure we don't do an SMB2 aio write if RECVFILE is active.
via 8543a7b samba-tool/dns: Fix a typo in ttl variable name
via aad5eeb fileserver: raise the debug level for share connection from non IPC to 2
from d51b498 s3:locking add NDR debug in share_mode_forall
http://gitweb.samba.org/?p=samba.git;a=shortlog;h=master
- Log -----------------------------------------------------------------
commit 95f7fc83b251efefcc2a603b936b55e2f0308a72
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 8 10:49:03 2013 -0700
Ensure the RECVFILE path in vfs_pwrite_data() operates on a blocking socket.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
Autobuild-User(master): Jeremy Allison <jra at samba.org>
Autobuild-Date(master): Sat Apr 20 01:04:05 CEST 2013 on sn-devel-104
commit 1ed710c2ffc91d8b33b87e572a6075e0126b5826
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 8 10:32:10 2013 -0700
Ensure the RECVFILE path in vfs_write_data() operates on a blocking socket.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 1b46db7b24a4f064706c2c7e712452135a3fed34
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 8 10:16:48 2013 -0700
Ensure drain_socket() operates on a blocking socket.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 1a7cec37e725c9f29fd71788e15623d904b41c8a
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 1 11:16:01 2013 -0700
Add the internals of is_smb2_recvfile_write.
This turns on the real receivefile detection, and completes
the receivefile code path changes.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 53b87f2fbabe3a2dcb5df6f6c494ef332bea81e7
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 1 13:24:07 2013 -0700
The guts of the receivefile code changes.
If an incoming PDU might qualify, only read
SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN = (SMB2_HEADER + SMB2_WRITE_BODY_LEN)
bytes rather than the whole PDU.
Next time we're called, use is_smb2_recvfile_write() to decide if
this is an SMB2_WRITE that fit the receivefile criteria, otherwise
just read the rest of the PDU.
If we did do a short receivefile read, set up the smb2_req->smb1req->unread_bytes
value to show what bytes remain in the TCP buffers.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit fdcaf0fa360b9590114605d24af545b1d42b9fd5
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 1 13:19:01 2013 -0700
Add stub static function that will turn on/off receivefile code path.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 4b91097002d73ae5dd2d4ac225f8e9eecca11e49
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 1 13:17:09 2013 -0700
Add extra fields into struct smbd_smb2_request_read_state to support receivefile.
Initialize min_recv_size with the size that will trigger the
receivefile write path.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 36d4b9d208c0025f054ad8ae4062ca3c81e345d5
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 1 13:14:13 2013 -0700
Add macro SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN.
This is the 'short' length we'll read in the SMB2_WRITE receivefile
code path.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 61da7f00b3f3daebb82e6a5d987883e0897dc4e9
Author: Jeremy Allison <jra at samba.org>
Date: Mon Apr 1 13:12:55 2013 -0700
Add utility function get_min_receive_file_size().
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 63739440f128229a6a99d0653562d3735ae909fb
Author: Jeremy Allison <jra at samba.org>
Date: Tue Mar 19 12:36:52 2013 -0700
Allow smbd_smb2_request_error_ex() to cope with unread bytes on error.
Drain the socket if a RECVFILE write failed.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit a36d7633bd3608b71f610fc9df2ad9c66bfdd9c6
Author: Jeremy Allison <jra at samba.org>
Date: Tue Mar 19 12:24:17 2013 -0700
Add function smbd_smb2_unread_bytes().
Returns number of bytes left to read for recvfile. Will be
used in SMB_2_WRITE_FILE code path.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit ec9fc986da8279f15338b7682c629bfdfc36d016
Author: Jeremy Allison <jra at samba.org>
Date: Tue Mar 19 12:16:32 2013 -0700
If we already have an smb1req attached to the struct smbd_smb2_request, don't recreate it.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 9791c1a24822d8b46bf7dd231b615d281b58540b
Author: Jeremy Allison <jra at samba.org>
Date: Mon Mar 18 12:00:25 2013 -0700
Ensure we don't do an SMB2 aio write if RECVFILE is active.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Stefan (metze) Metzmacher <metze at samba.org>
commit 8543a7b9b3b1efe2911b32c5f7c1cd3db85681b1
Author: Amitay Isaacs <amitay at gmail.com>
Date: Sat Apr 20 00:46:19 2013 +1000
samba-tool/dns: Fix a typo in ttl variable name
Signed-off-by: Amitay Isaacs <amitay at gmail.com>
Reviewed-by: Jeremy Allison <jra at samba.org>
commit aad5eeb9b4f67b03988ceefb7888cb63ecefcf30
Author: Matthieu Patou <mat at matws.net>
Date: Sat Jan 26 14:42:57 2013 -0800
fileserver: raise the debug level for share connection from non IPC to 2
So that logs of make test are not spamed, the code dates from 1999 maybe
at that moment we wanted to have some warning I think nodays it's pretty
stable.
Reviewed-by: Jeremy Allison <jra at samba.org>
-----------------------------------------------------------------------
Summary of changes:
python/samba/netcmd/dns.py | 2 +-
source3/lib/recvfile.c | 17 +++++-
source3/smbd/aio.c | 5 ++
source3/smbd/globals.h | 3 +
source3/smbd/service.c | 2 +-
source3/smbd/smb2_glue.c | 22 +++++++-
source3/smbd/smb2_server.c | 130 ++++++++++++++++++++++++++++++++++++++++++--
source3/smbd/vfs.c | 26 ++++++++-
8 files changed, 193 insertions(+), 14 deletions(-)
Changeset truncated at 500 lines:
diff --git a/python/samba/netcmd/dns.py b/python/samba/netcmd/dns.py
index 309951d..439b02d 100644
--- a/python/samba/netcmd/dns.py
+++ b/python/samba/netcmd/dns.py
@@ -424,7 +424,7 @@ class PTRRecord(dnsserver.DNS_RPC_RECORD):
self.wType = dnsp.DNS_TYPE_PTR
self.dwFlags = rank | node_flag
self.dwSerial = serial
- self.dwTtleSeconds = ttl
+ self.dwTtlSeconds = ttl
self._ptr = ptr[:]
ptr_name = dnsserver.DNS_RPC_NAME()
ptr_name.str = self._ptr
diff --git a/source3/lib/recvfile.c b/source3/lib/recvfile.c
index c53ba77..72f4257 100644
--- a/source3/lib/recvfile.c
+++ b/source3/lib/recvfile.c
@@ -240,6 +240,7 @@ ssize_t sys_recvfile(int fromfd,
/*****************************************************************
Throw away "count" bytes from the client socket.
Returns count or -1 on error.
+ Must only operate on a blocking socket.
*****************************************************************/
ssize_t drain_socket(int sockfd, size_t count)
@@ -247,6 +248,7 @@ ssize_t drain_socket(int sockfd, size_t count)
size_t total = 0;
size_t bufsize = MIN(TRANSFER_BUF_SIZE,count);
char *buffer = NULL;
+ int old_flags = 0;
if (count == 0) {
return 0;
@@ -257,6 +259,12 @@ ssize_t drain_socket(int sockfd, size_t count)
return -1;
}
+ old_flags = fcntl(sockfd, F_GETFL, 0);
+ if (set_blocking(sockfd, true) == -1) {
+ free(buffer);
+ return -1;
+ }
+
while (total < count) {
ssize_t read_ret;
size_t toread = MIN(bufsize,count - total);
@@ -265,12 +273,17 @@ ssize_t drain_socket(int sockfd, size_t count)
read_ret = sys_read(sockfd, buffer, toread);
if (read_ret <= 0) {
/* EOF or socket error. */
- free(buffer);
- return -1;
+ count = (size_t)-1;
+ goto out;
}
total += read_ret;
}
+ out:
+
free(buffer);
+ if (fcntl(sockfd, F_SETFL, old_flags) == -1) {
+ return -1;
+ }
return count;
}
diff --git a/source3/smbd/aio.c b/source3/smbd/aio.c
index 3f553eb..e8be408 100644
--- a/source3/smbd/aio.c
+++ b/source3/smbd/aio.c
@@ -861,6 +861,11 @@ NTSTATUS schedule_aio_smb2_write(connection_struct *conn,
return NT_STATUS_RETRY;
}
+ if (smbreq->unread_bytes) {
+ /* Can't do async with recvfile. */
+ return NT_STATUS_RETRY;
+ }
+
if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
return NT_STATUS_NO_MEMORY;
}
diff --git a/source3/smbd/globals.h b/source3/smbd/globals.h
index 1502758..46baeed 100644
--- a/source3/smbd/globals.h
+++ b/source3/smbd/globals.h
@@ -247,6 +247,7 @@ NTSTATUS smbd_smb2_request_pending_queue(struct smbd_smb2_request *req,
uint32_t defer_time);
struct smb_request *smbd_smb2_fake_smb_request(struct smbd_smb2_request *req);
+size_t smbd_smb2_unread_bytes(struct smbd_smb2_request *req);
void remove_smb2_chained_fsp(files_struct *fsp);
NTSTATUS smbd_smb2_request_verify_creditcharge(struct smbd_smb2_request *req,
@@ -548,6 +549,8 @@ struct smbd_smb2_request {
#define SMBD_SMB2_OUT_DYN_PTR(req) (uint8_t *)(SMBD_SMB2_OUT_DYN_IOV(req)->iov_base)
#define SMBD_SMB2_OUT_DYN_LEN(req) (SMBD_SMB2_OUT_DYN_IOV(req)->iov_len)
+#define SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN (SMB2_HDR_BODY + 0x30)
+
struct {
/*
* vector[0] TRANSPORT HEADER (empty)
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index 4c0832a..a7464f0 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -845,7 +845,7 @@ static NTSTATUS make_connection_snum(struct smbd_server_connection *sconn,
* (at least initially).
*/
- if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
+ if( DEBUGLVL( IS_IPC(conn) ? 3 : 2 ) ) {
dbgtext( "%s (%s) ", get_remote_machine_name(),
tsocket_address_string(conn->sconn->remote_address,
talloc_tos()) );
diff --git a/source3/smbd/smb2_glue.c b/source3/smbd/smb2_glue.c
index 1b2b4dd..54135b5 100644
--- a/source3/smbd/smb2_glue.c
+++ b/source3/smbd/smb2_glue.c
@@ -28,9 +28,13 @@ struct smb_request *smbd_smb2_fake_smb_request(struct smbd_smb2_request *req)
struct smb_request *smbreq;
const uint8_t *inhdr = SMBD_SMB2_IN_HDR_PTR(req);
- smbreq = talloc_zero(req, struct smb_request);
- if (smbreq == NULL) {
- return NULL;
+ if (req->smb1req) {
+ smbreq = req->smb1req;
+ } else {
+ smbreq = talloc_zero(req, struct smb_request);
+ if (smbreq == NULL) {
+ return NULL;
+ }
}
smbreq->request_time = req->request_time;
@@ -55,6 +59,18 @@ struct smb_request *smbd_smb2_fake_smb_request(struct smbd_smb2_request *req)
}
/*********************************************************
+ Are there unread bytes for recvfile ?
+*********************************************************/
+
+size_t smbd_smb2_unread_bytes(struct smbd_smb2_request *req)
+{
+ if (req->smb1req) {
+ return req->smb1req->unread_bytes;
+ }
+ return 0;
+}
+
+/*********************************************************
Called from file_free() to remove any chained fsp pointers.
*********************************************************/
diff --git a/source3/smbd/smb2_server.c b/source3/smbd/smb2_server.c
index eb7059e..57e9c7b 100644
--- a/source3/smbd/smb2_server.c
+++ b/source3/smbd/smb2_server.c
@@ -2621,11 +2621,21 @@ NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
{
DATA_BLOB body;
uint8_t *outhdr = SMBD_SMB2_OUT_HDR_PTR(req);
+ size_t unread_bytes = smbd_smb2_unread_bytes(req);
DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
req->current_idx, nt_errstr(status), info ? " +info" : "",
location));
+ if (unread_bytes) {
+ /* Recvfile error. Drain incoming socket. */
+ size_t ret = drain_socket(req->sconn->sock, unread_bytes);
+ if (ret != unread_bytes) {
+ smbd_server_connection_terminate(req->sconn,
+ "Failed to drain SMB2 socket\n");
+ }
+ }
+
body.data = outhdr + SMB2_HDR_BODY;
body.length = 8;
SSVAL(body.data, 0, 9);
@@ -2821,6 +2831,8 @@ struct smbd_smb2_request_read_state {
uint8_t nbt[NBT_HDR_SIZE];
bool done;
} hdr;
+ bool doing_receivefile;
+ size_t min_recv_size;
size_t pktlen;
uint8_t *pktbuf;
};
@@ -2832,6 +2844,17 @@ static int smbd_smb2_request_next_vector(struct tstream_context *stream,
size_t *_count);
static void smbd_smb2_request_read_done(struct tevent_req *subreq);
+static size_t get_min_receive_file_size(struct smbd_smb2_request *smb2_req)
+{
+ if (smb2_req->do_signing) {
+ return 0;
+ }
+ if (smb2_req->do_encryption) {
+ return 0;
+ }
+ return (size_t)lp_min_receive_file_size();
+}
+
static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_server_connection *sconn)
@@ -2853,6 +2876,7 @@ static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
return tevent_req_post(req, ev);
}
state->smb2_req->sconn = sconn;
+ state->min_recv_size = get_min_receive_file_size(state->smb2_req);
subreq = tstream_readv_pdu_queue_send(state->smb2_req,
state->ev,
@@ -2868,6 +2892,47 @@ static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
return req;
}
+static bool is_smb2_recvfile_write(struct smbd_smb2_request_read_state *state)
+{
+ uint32_t flags;
+
+ if (IVAL(state->pktbuf, 0) == SMB2_TF_MAGIC) {
+ /* Transform header. Cannot recvfile. */
+ return false;
+ }
+ if (IVAL(state->pktbuf, 0) != SMB2_MAGIC) {
+ /* Not SMB2. Normal error path will cope. */
+ return false;
+ }
+ if (SVAL(state->pktbuf, 4) != SMB2_HDR_BODY) {
+ /* Not SMB2. Normal error path will cope. */
+ return false;
+ }
+ if (SVAL(state->pktbuf, SMB2_HDR_OPCODE) != SMB2_OP_WRITE) {
+ /* Needs to be a WRITE. */
+ return false;
+ }
+ if (IVAL(state->pktbuf, SMB2_HDR_NEXT_COMMAND) != 0) {
+ /* Chained. Cannot recvfile. */
+ return false;
+ }
+ flags = IVAL(state->pktbuf, SMB2_HDR_FLAGS);
+ if (flags & SMB2_HDR_FLAG_CHAINED) {
+ /* Chained. Cannot recvfile. */
+ return false;
+ }
+ if (flags & SMB2_HDR_FLAG_SIGNED) {
+ /* Signed. Cannot recvfile. */
+ return false;
+ }
+
+ DEBUG(10,("Doing recvfile write len = %u\n",
+ (unsigned int)(state->pktlen -
+ SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN)));
+
+ return true;
+}
+
static int smbd_smb2_request_next_vector(struct tstream_context *stream,
void *private_data,
TALLOC_CTX *mem_ctx,
@@ -2877,12 +2942,38 @@ static int smbd_smb2_request_next_vector(struct tstream_context *stream,
struct smbd_smb2_request_read_state *state =
talloc_get_type_abort(private_data,
struct smbd_smb2_request_read_state);
- struct iovec *vector;
+ struct iovec *vector = NULL;
+ size_t min_recvfile_size = UINT32_MAX;
if (state->pktlen > 0) {
- /* if there're no remaining bytes, we're done */
- *_vector = NULL;
- *_count = 0;
+ if (state->doing_receivefile && !is_smb2_recvfile_write(state)) {
+ /*
+ * Not a possible receivefile write.
+ * Read the rest of the data.
+ */
+ state->doing_receivefile = false;
+ vector = talloc_array(mem_ctx, struct iovec, 1);
+ if (vector == NULL) {
+ return -1;
+ }
+ vector[0].iov_base = (void *)(state->pktbuf +
+ SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN);
+ vector[0].iov_len = (state->pktlen -
+ SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN);
+ *_vector = vector;
+ *_count = 1;
+ } else {
+ /*
+ * Either this is a receivefile write so we've
+ * done a short read, or if not we have all the data.
+ * Either way, we're done and
+ * smbd_smb2_request_read_done() will handle
+ * and short read case by looking at the
+ * state->doing_receivefile value.
+ */
+ *_vector = NULL;
+ *_count = 0;
+ }
return 0;
}
@@ -2928,7 +3019,26 @@ static int smbd_smb2_request_next_vector(struct tstream_context *stream,
}
vector[0].iov_base = (void *)state->pktbuf;
- vector[0].iov_len = state->pktlen;
+
+ if (state->min_recv_size != 0) {
+ min_recvfile_size = SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN;
+ min_recvfile_size += state->min_recv_size;
+ }
+
+ if (state->pktlen > min_recvfile_size) {
+ /*
+ * Might be a receivefile write. Read the SMB2 HEADER +
+ * SMB2_WRITE header first. Set 'doing_receivefile'
+ * as we're *attempting* receivefile write. If this
+ * turns out not to be a SMB2_WRITE request or otherwise
+ * not suitable then we'll just read the rest of the data
+ * the next time this function is called.
+ */
+ vector[0].iov_len = SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN;
+ state->doing_receivefile = true;
+ } else {
+ vector[0].iov_len = state->pktlen;
+ }
*_vector = vector;
*_count = 1;
@@ -2991,6 +3101,16 @@ static void smbd_smb2_request_read_done(struct tevent_req *subreq)
return;
}
+ if (state->doing_receivefile) {
+ state->smb2_req->smb1req = talloc_zero(state->smb2_req,
+ struct smb_request);
+ if (tevent_req_nomem(state->smb2_req->smb1req, req)) {
+ return;
+ }
+ state->smb2_req->smb1req->unread_bytes =
+ state->pktlen - SMBD_SMB2_SHORT_RECEIVEFILE_WRITE_LEN;
+ }
+
state->smb2_req->current_idx = 1;
tevent_req_done(req);
diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index 856e090..49609d0 100644
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -428,14 +428,25 @@ ssize_t vfs_write_data(struct smb_request *req,
ssize_t ret;
if (req && req->unread_bytes) {
+ int sockfd = req->sconn->sock;
+ int old_flags;
SMB_ASSERT(req->unread_bytes == N);
/* VFS_RECVFILE must drain the socket
* before returning. */
req->unread_bytes = 0;
- return SMB_VFS_RECVFILE(req->sconn->sock,
+ /* Ensure the socket is blocking. */
+ old_flags = fcntl(sockfd, F_GETFL, 0);
+ if (set_blocking(sockfd, true) == -1) {
+ return (ssize_t)-1;
+ }
+ ret = SMB_VFS_RECVFILE(sockfd,
fsp,
(off_t)-1,
N);
+ if (fcntl(sockfd, F_SETFL, old_flags) == -1) {
+ return (ssize_t)-1;
+ }
+ return ret;
}
while (total < N) {
@@ -461,14 +472,25 @@ ssize_t vfs_pwrite_data(struct smb_request *req,
ssize_t ret;
if (req && req->unread_bytes) {
+ int sockfd = req->sconn->sock;
+ int old_flags;
SMB_ASSERT(req->unread_bytes == N);
/* VFS_RECVFILE must drain the socket
* before returning. */
req->unread_bytes = 0;
- return SMB_VFS_RECVFILE(req->sconn->sock,
+ /* Ensure the socket is blocking. */
+ old_flags = fcntl(sockfd, F_GETFL, 0);
+ if (set_blocking(sockfd, true) == -1) {
+ return (ssize_t)-1;
+ }
+ ret = SMB_VFS_RECVFILE(sockfd,
fsp,
offset,
N);
+ if (fcntl(sockfd, F_SETFL, old_flags) == -1) {
+ return (ssize_t)-1;
+ }
+ return ret;
}
while (total < N) {
--
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