[PATCH BlueZ 00/17] Fix errno handling convention

[PATCH BlueZ 00/17] Fix errno handling convention

[Anderson Lizardo]

Hi,

This series fix various places where variables which get errno values (usually
named "err") are not following the convention of always being negative. The
last 3 patches are simple fixes found during this review.

Best Regards,
--
Anderson Lizardo
Instituto Nokia de Tecnologia (INdT)
Manaus - Brazil

[PATCH BlueZ 01/17] AVCTP: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.

This patch also fixes a bug related to not using an "err" variable to
store the errno value before calling external library code.
---
 audio/avctp.c |   31 +++++++++++++------------------
 1 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/audio/avctp.c b/audio/avctp.c
index df3b2b8..5bd5db1 100644
--- a/audio/avctp.c
+++ b/audio/avctp.c
@@ -502,10 +502,10 @@ static int uinput_create(char *name)
 		if (fd < 0) {
 			fd = open("/dev/misc/uinput", O_RDWR);
 			if (fd < 0) {
-				err = errno;
+				err = -errno;
 				error("Can't open input device: %s (%d)",
-							strerror(err), err);
-				return -err;
+							strerror(-err), -err);
+				return err;
 			}
 		}
 	}
@@ -520,12 +520,11 @@ static int uinput_create(char *name)
 	dev.id.version = 0x0000;
 
 	if (write(fd, &dev, sizeof(dev)) < 0) {
-		err = errno;
+		err = -errno;
 		error("Can't write device information: %s (%d)",
-						strerror(err), err);
+						strerror(-err), -err);
 		close(fd);
-		errno = err;
-		return -err;
+		return err;
 	}
 
 	ioctl(fd, UI_SET_EVBIT, EV_KEY);
@@ -537,12 +536,11 @@ static int uinput_create(char *name)
 		ioctl(fd, UI_SET_KEYBIT, key_map[i].uinput);
 
 	if (ioctl(fd, UI_DEV_CREATE, NULL) < 0) {
-		err = errno;
+		err = -errno;
 		error("Can't create uinput device: %s (%d)",
-						strerror(err), err);
+						strerror(-err), -err);
 		close(fd);
-		errno = err;
-		return -err;
+		return err;
 	}
 
 	return fd;
@@ -895,7 +893,7 @@ int avctp_send_vendordep(struct avctp *session, uint8_t transaction,
 	struct avctp_header *avctp;
 	struct avc_header *avc;
 	uint8_t *pdu;
-	int sk, err;
+	int sk, err = 0;
 	uint16_t size;
 
 	if (session->state != AVCTP_STATE_CONNECTED)
@@ -920,14 +918,11 @@ int avctp_send_vendordep(struct avctp *session, uint8_t transaction,
 
 	memcpy(pdu, operands, operand_count);
 
-	err = write(sk, buf, size);
-	if (err < 0) {
-		g_free(buf);
-		return -errno;
-	}
+	if (write(sk, buf, size) < 0)
+		err = -errno;
 
 	g_free(buf);
-	return 0;
+	return err;
 }
 
 unsigned int avctp_add_state_cb(avctp_state_cb cb, void *user_data)
-- 
1.7.0.4

[PATCH BlueZ 02/17] AVDTP: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 audio/gstavdtpsink.c |   22 ++++++++++++----------
 1 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/audio/gstavdtpsink.c b/audio/gstavdtpsink.c
index 0f3abf3..f379469 100644
--- a/audio/gstavdtpsink.c
+++ b/audio/gstavdtpsink.c
@@ -279,10 +279,10 @@ static gint gst_avdtp_sink_bluetooth_recvmsg_fd(GstAvdtpSink *sink)
 			g_io_channel_unix_get_fd(sink->server));
 
 	if (ret < 0) {
-		err = errno;
+		err = -errno;
 		GST_ERROR_OBJECT(sink, "Unable to receive fd: %s (%d)",
-				strerror(err), err);
-		return -err;
+				strerror(-err), -err);
+		return err;
 	}
 
 	sink->stream = g_io_channel_unix_new(ret);
@@ -1449,9 +1449,9 @@ static gboolean gst_avdtp_sink_start(GstBaseSink *basesink)
 
 	sk = bt_audio_service_open();
 	if (sk <= 0) {
-		err = errno;
+		err = -errno;
 		GST_ERROR_OBJECT(self, "Cannot open connection to bt "
-			"audio service: %s %d", strerror(err), err);
+			"audio service: %s %d", strerror(-err), -err);
 		goto failed;
 	}
 
@@ -1841,7 +1841,7 @@ static int gst_avdtp_sink_audioservice_send(GstAvdtpSink *self,
 	ssize_t written;
 	const char *type, *name;
 	uint16_t length;
-	int fd;
+	int fd, err;
 
 	length = msg->length ? msg->length : BT_SUGGESTED_BUFFER_SIZE;
 
@@ -1849,9 +1849,10 @@ static int gst_avdtp_sink_audioservice_send(GstAvdtpSink *self,
 
 	written = write(fd, msg, length);
 	if (written < 0) {
+		err = -errno;
 		GST_ERROR_OBJECT(self, "Error sending data to audio service:"
-			" %s", strerror(errno));
-		return -errno;
+			" %s", strerror(-err));
+		return err;
 	}
 
 	type = bt_audio_strtype(msg->type);
@@ -1876,9 +1877,10 @@ static int gst_avdtp_sink_audioservice_recv(GstAvdtpSink *self,
 
 	bytes_read = read(fd, inmsg, length);
 	if (bytes_read < 0) {
+		err = -errno;
 		GST_ERROR_OBJECT(self, "Error receiving data from "
-				"audio service: %s", strerror(errno));
-		return -errno;
+				"audio service: %s", strerror(-err));
+		return err;
 	}
 
 	type = bt_audio_strtype(inmsg->type);
-- 
1.7.0.4

[PATCH BlueZ 03/17] audio/IPC: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.

This commit also changes places where errno can be replaced with -err
(for consistency) and one perror() usage error.
---
 audio/ipc.c    |   18 +++++++++---------
 test/ipctest.c |   12 ++++++++----
 2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/audio/ipc.c b/audio/ipc.c
index 669eeef..02d956b 100644
--- a/audio/ipc.c
+++ b/audio/ipc.c
@@ -56,19 +56,19 @@ int bt_audio_service_open(void)
 
 	sk = socket(PF_LOCAL, SOCK_STREAM, 0);
 	if (sk < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "%s: Cannot open socket: %s (%d)\n",
-			__FUNCTION__, strerror(err), err);
-		errno = err;
+			__FUNCTION__, strerror(-err), -err);
+		errno = -err;
 		return -1;
 	}
 
 	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "%s: connect() failed: %s (%d)\n",
-			__FUNCTION__, strerror(err), err);
+			__FUNCTION__, strerror(-err), -err);
 		close(sk);
-		errno = err;
+		errno = -err;
 		return -1;
 	}
 
@@ -96,10 +96,10 @@ int bt_audio_service_get_data_fd(int sk)
 
 	ret = recvmsg(sk, &msgh, 0);
 	if (ret < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "%s: Unable to receive fd: %s (%d)\n",
-			__FUNCTION__, strerror(err), err);
-		errno = err;
+			__FUNCTION__, strerror(-err), -err);
+		errno = -err;
 		return -1;
 	}
 
diff --git a/test/ipctest.c b/test/ipctest.c
index 9fdfac4..4968443 100644
--- a/test/ipctest.c
+++ b/test/ipctest.c
@@ -139,7 +139,7 @@ static int service_send(struct userdata *u, const bt_audio_msg_header_t *msg)
 	else {
 		err = -errno;
 		ERR("Error sending data to audio service: %s(%d)",
-			strerror(errno), errno);
+			strerror(-err), -err);
 	}
 
 	return err;
@@ -171,7 +171,7 @@ static int service_recv(struct userdata *u, bt_audio_msg_header_t *rsp)
 	} else {
 		err = -errno;
 		ERR("Error receiving data from audio service: %s(%d)",
-			strerror(errno), errno);
+			strerror(-err), -err);
 	}
 
 	return err;
@@ -215,8 +215,12 @@ static int init_bt(struct userdata *u)
 
 	u->service_fd = bt_audio_service_open();
 	if (u->service_fd <= 0) {
-		perror(strerror(errno));
-		return errno;
+		int err = -errno;
+
+		ERR("bt_audio_service_open() failed: %s (%d)", strerror(-err),
+									-err);
+
+		return err;
 	}
 
 	return 0;
-- 
1.7.0.4

[PATCH BlueZ 04/17] audio/PCM: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 audio/pcm_bluetooth.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/audio/pcm_bluetooth.c b/audio/pcm_bluetooth.c
index e633d1a..4d85f33 100644
--- a/audio/pcm_bluetooth.c
+++ b/audio/pcm_bluetooth.c
@@ -420,9 +420,10 @@ static int bluetooth_prepare(snd_pcm_ioplug_t *io)
 	}
 
 	/* wake up any client polling at us */
-	err = write(data->pipefd[1], &c, 1);
-	if (err < 0)
+	if (write(data->pipefd[1], &c, 1) < 0) {
+		err = -errno;
 		return err;
+	}
 
 	return 0;
 }
@@ -968,7 +969,7 @@ static snd_pcm_sframes_t bluetooth_a2dp_read(snd_pcm_ioplug_t *io,
 
 static int avdtp_write(struct bluetooth_data *data)
 {
-	int ret = 0;
+	int err;
 	struct rtp_header *header;
 	struct rtp_payload *payload;
 	struct bluetooth_a2dp *a2dp = &data->a2dp;
@@ -985,10 +986,10 @@ static int avdtp_write(struct bluetooth_data *data)
 	header->timestamp = htonl(a2dp->nsamples);
 	header->ssrc = htonl(1);
 
-	ret = send(data->stream.fd, a2dp->buffer, a2dp->count, MSG_DONTWAIT);
-	if (ret < 0) {
-		DBG("send returned %d errno %s.", ret, strerror(errno));
-		ret = -errno;
+	err = send(data->stream.fd, a2dp->buffer, a2dp->count, MSG_DONTWAIT);
+	if (err < 0) {
+		err = -errno;
+		DBG("send failed: %s (%d)", strerror(-err), -err);
 	}
 
 	/* Reset buffer of data to send */
@@ -997,7 +998,7 @@ static int avdtp_write(struct bluetooth_data *data)
 	a2dp->samples = 0;
 	a2dp->seq_num++;
 
-	return ret;
+	return err;
 }
 
 static snd_pcm_sframes_t bluetooth_a2dp_write(snd_pcm_ioplug_t *io,
@@ -1546,7 +1547,7 @@ static int audioservice_send(int sk, const bt_audio_msg_header_t *msg)
 	else {
 		err = -errno;
 		SNDERR("Error sending data to audio service: %s(%d)",
-			strerror(errno), errno);
+			strerror(-err), -err);
 	}
 
 	return err;
@@ -1567,7 +1568,7 @@ static int audioservice_recv(int sk, bt_audio_msg_header_t *inmsg)
 	if (ret < 0) {
 		err = -errno;
 		SNDERR("Error receiving IPC data from bluetoothd: %s (%d)",
-						strerror(errno), errno);
+						strerror(-err), -err);
 	} else if ((size_t) ret < sizeof(bt_audio_msg_header_t)) {
 		SNDERR("Too short (%d bytes) IPC packet from bluetoothd", ret);
 		err = -EINVAL;
-- 
1.7.0.4

[PATCH BlueZ 05/17] audio: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 audio/ctl_bluetooth.c |   13 +++++++------
 audio/unix.c          |   21 ++++++++++++---------
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/audio/ctl_bluetooth.c b/audio/ctl_bluetooth.c
index d941421..a16f476 100644
--- a/audio/ctl_bluetooth.c
+++ b/audio/ctl_bluetooth.c
@@ -257,18 +257,19 @@ static int bluetooth_read_event(snd_ctl_ext_t *ext, snd_ctl_elem_id_t *id,
 	struct bluetooth_data *data = ext->private_data;
 	char buf[BT_SUGGESTED_BUFFER_SIZE];
 	struct bt_control_ind *ind = (void *) buf;
-	int ret;
+	int err;
 	const char *type, *name;
 
 	DBG("ext %p id %p", ext, id);
 
 	memset(buf, 0, sizeof(buf));
 
-	ret = recv(data->sock, ind, BT_SUGGESTED_BUFFER_SIZE, MSG_DONTWAIT);
-	if (ret < 0) {
-		SNDERR("Failed while receiving data: %s (%d)",
-				strerror(errno), errno);
-		return -errno;
+	err = recv(data->sock, ind, BT_SUGGESTED_BUFFER_SIZE, MSG_DONTWAIT);
+	if (err < 0) {
+		err = -errno;
+		SNDERR("Failed while receiving data: %s (%d)", strerror(-err),
+									-err);
+		return err;
 	}
 
 	type = bt_audio_strtype(ind->h.type);
diff --git a/audio/unix.c b/audio/unix.c
index 4e0a6f9..5199831 100644
--- a/audio/unix.c
+++ b/audio/unix.c
@@ -1864,25 +1864,28 @@ int unix_init(void)
 
 	sk = socket(PF_LOCAL, SOCK_STREAM, 0);
 	if (sk < 0) {
-		err = errno;
-		error("Can't create unix socket: %s (%d)", strerror(err), err);
-		return -err;
+		err = -errno;
+		error("Can't create unix socket: %s (%d)", strerror(-err),
+									-err);
+		return err;
 	}
 
 	if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		error("Can't bind unix socket: %s (%d)", strerror(errno),
-				errno);
+		err = -errno;
+		error("Can't bind unix socket: %s (%d)", strerror(-err),
+									-err);
 		close(sk);
-		return -1;
+		return err;
 	}
 
 	set_nonblocking(sk);
 
 	if (listen(sk, 1) < 0) {
-		error("Can't listen on unix socket: %s (%d)",
-						strerror(errno), errno);
+		err = -errno;
+		error("Can't listen on unix socket: %s (%d)", strerror(-err),
+									-err);
 		close(sk);
-		return -1;
+		return err;
 	}
 
 	unix_sock = sk;
-- 
1.7.0.4

[PATCH BlueZ 06/17] serial: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 serial/port.c  |    6 +++---
 serial/proxy.c |   39 ++++++++++++++++++---------------------
 2 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/serial/port.c b/serial/port.c
index fa302be..3b36d44 100644
--- a/serial/port.c
+++ b/serial/port.c
@@ -183,16 +183,16 @@ static int port_release(struct serial_port *port)
 	req.flags = (1 << RFCOMM_HANGUP_NOW);
 
 	if (ioctl(rfcomm_ctl, RFCOMMRELEASEDEV, &req) < 0) {
-		err = errno;
+		err = -errno;
 		error("Can't release device %s: %s (%d)",
-				port->dev, strerror(err), err);
+				port->dev, strerror(-err), -err);
 	}
 
 	g_free(port->dev);
 	port->dev = NULL;
 	port->id = -1;
 	close(rfcomm_ctl);
-	return -err;
+	return err;
 }
 
 static void serial_port_free(void *data)
diff --git a/serial/proxy.c b/serial/proxy.c
index 371ad5f..736f690 100644
--- a/serial/proxy.c
+++ b/serial/proxy.c
@@ -289,19 +289,18 @@ static inline int unix_socket_connect(const char *address)
 	/* Unix socket */
 	sk = socket(AF_UNIX, SOCK_STREAM, 0);
 	if (sk < 0) {
-		err = errno;
+		err = -errno;
 		error("Unix socket(%s) create failed: %s(%d)",
-				address, strerror(err), err);
-		return -err;
+				address, strerror(-err), -err);
+		return err;
 	}
 
 	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		err = errno;
+		err = -errno;
 		error("Unix socket(%s) connect failed: %s(%d)",
-				address, strerror(err), err);
+				address, strerror(-err), -err);
 		close(sk);
-		errno = err;
-		return -err;
+		return err;
 	}
 
 	return sk;
@@ -329,18 +328,17 @@ static int tcp_socket_connect(const char *address)
 
 	sk = socket(PF_INET, SOCK_STREAM, 0);
 	if (sk < 0) {
-		err = errno;
+		err = -errno;
 		error("TCP socket(%s) create failed %s(%d)", address,
-							strerror(err), err);
-		return -err;
+							strerror(-err), -err);
+		return err;
 	}
 	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		err = errno;
+		err = -errno;
 		error("TCP socket(%s) connect failed: %s(%d)",
-						address, strerror(err), err);
+						address, strerror(-err), -err);
 		close(sk);
-		errno = err;
-		return -err;
+		return err;
 	}
 	return sk;
 }
@@ -351,18 +349,17 @@ static inline int tty_open(const char *tty, struct termios *ti)
 
 	sk = open(tty, O_RDWR | O_NOCTTY);
 	if (sk < 0) {
-		err = errno;
-		error("Can't open TTY %s: %s(%d)", tty, strerror(err), err);
-		return -err;
+		err = -errno;
+		error("Can't open TTY %s: %s(%d)", tty, strerror(-err), -err);
+		return err;
 	}
 
 	if (ti && tcsetattr(sk, TCSANOW, ti) < 0) {
-		err = errno;
+		err = -errno;
 		error("Can't change serial settings: %s(%d)",
-				strerror(err), err);
+				strerror(-err), -err);
 		close(sk);
-		errno = err;
-		return -err;
+		return err;
 	}
 
 	return sk;
-- 
1.7.0.4

[PATCH BlueZ 07/17] hcitool: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 tools/hcitool.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/tools/hcitool.c b/tools/hcitool.c
index 5c4a0bc..5189d8d 100644
--- a/tools/hcitool.c
+++ b/tools/hcitool.c
@@ -2696,9 +2696,9 @@ static void cmd_lewladd(int dev_id, int argc, char **argv)
 	hci_close_dev(dd);
 
 	if (err < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "Can't add to white list: %s(%d)\n",
-							strerror(err), err);
+							strerror(-err), -err);
 		exit(1);
 	}
 }
@@ -2786,9 +2786,9 @@ static void cmd_lewlsz(int dev_id, int argc, char **argv)
 	hci_close_dev(dd);
 
 	if (err < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "Can't read white list size: %s(%d)\n",
-							strerror(err), err);
+							strerror(-err), -err);
 		exit(1);
 	}
 
@@ -2831,9 +2831,9 @@ static void cmd_lewlclr(int dev_id, int argc, char **argv)
 	hci_close_dev(dd);
 
 	if (err < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "Can't clear white list: %s(%d)\n",
-							strerror(err), err);
+							strerror(-err), -err);
 		exit(1);
 	}
 }
@@ -2961,9 +2961,9 @@ static void cmd_lecup(int dev_id, int argc, char **argv)
 
 	if (hci_le_conn_update(dd, htobs(handle), htobs(min), htobs(max),
 				htobs(latency), htobs(timeout), 5000) < 0) {
-		int err = errno;
+		int err = -errno;
 		fprintf(stderr, "Could not change connection params: %s(%d)\n",
-							strerror(err), err);
+							strerror(-err), -err);
 	}
 
 	hci_close_dev(dd);
-- 
1.7.0.4

[PATCH BlueZ 08/17] hciconfig: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 tools/hciconfig.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/hciconfig.c b/tools/hciconfig.c
index cbd0d0e..35b80b1 100644
--- a/tools/hciconfig.c
+++ b/tools/hciconfig.c
@@ -210,9 +210,9 @@ static void cmd_le_addr(int ctl, int hdev, char *opt)
 
 	dd = hci_open_dev(hdev);
 	if (dd < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "Could not open device: %s(%d)\n",
-							strerror(err), err);
+							strerror(-err), -err);
 		exit(1);
 	}
 
@@ -230,9 +230,9 @@ static void cmd_le_addr(int ctl, int hdev, char *opt)
 
 	ret = hci_send_req(dd, &rq, 1000);
 	if (status || ret < 0) {
-		err = errno;
+		err = -errno;
 		fprintf(stderr, "Can't set random address for hci%d: "
-					"%s (%d)\n", hdev, strerror(err), err);
+				"%s (%d)\n", hdev, strerror(-err), -err);
 	}
 
 	hci_close_dev(dd);
-- 
1.7.0.4

[PATCH BlueZ 09/17] textfile: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 src/textfile.c |   56 ++++++++++++++++++++++++++++----------------------------
 1 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/src/textfile.c b/src/textfile.c
index 3fb3c01..2712cd8 100644
--- a/src/textfile.c
+++ b/src/textfile.c
@@ -149,7 +149,7 @@ static inline int write_key_value(int fd, const char *key, const char *value)
 	sprintf(str, "%s %s\n", key, value);
 
 	if (write(fd, str, size) < 0)
-		err = errno;
+		err = -errno;
 
 	free(str);
 
@@ -191,12 +191,12 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 		return -errno;
 
 	if (flock(fd, LOCK_EX) < 0) {
-		err = errno;
+		err = -errno;
 		goto close;
 	}
 
 	if (fstat(fd, &st) < 0) {
-		err = errno;
+		err = -errno;
 		goto unlock;
 	}
 
@@ -213,7 +213,7 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 	map = mmap(NULL, size, PROT_READ | PROT_WRITE,
 					MAP_PRIVATE | MAP_LOCKED, fd, 0);
 	if (!map || map == MAP_FAILED) {
-		err = errno;
+		err = -errno;
 		goto unlock;
 	}
 
@@ -232,7 +232,7 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 
 	end = strnpbrk(off, size, "\r\n");
 	if (!end) {
-		err = EILSEQ;
+		err = -EILSEQ;
 		goto unmap;
 	}
 
@@ -247,7 +247,7 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 	if (!len) {
 		munmap(map, size);
 		if (ftruncate(fd, base) < 0) {
-			err = errno;
+			err = -errno;
 			goto unlock;
 		}
 		lseek(fd, base, SEEK_SET);
@@ -258,13 +258,13 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 	}
 
 	if (len < 0 || len > size) {
-		err = EILSEQ;
+		err = -EILSEQ;
 		goto unmap;
 	}
 
 	str = malloc(len);
 	if (!str) {
-		err = errno;
+		err = -errno;
 		goto unmap;
 	}
 
@@ -272,7 +272,7 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 
 	munmap(map, size);
 	if (ftruncate(fd, base) < 0) {
-		err = errno;
+		err = -errno;
 		free(str);
 		goto unlock;
 	}
@@ -281,7 +281,7 @@ static int write_key(const char *pathname, const char *key, const char *value, i
 		err = write_key_value(fd, key, value);
 
 	if (write(fd, str, len) < 0)
-		err = errno;
+		err = -errno;
 
 	free(str);
 
@@ -297,9 +297,9 @@ close:
 	fdatasync(fd);
 
 	close(fd);
-	errno = err;
+	errno = -err;
 
-	return -err;
+	return err;
 }
 
 static char *read_key(const char *pathname, const char *key, int icase)
@@ -314,12 +314,12 @@ static char *read_key(const char *pathname, const char *key, int icase)
 		return NULL;
 
 	if (flock(fd, LOCK_SH) < 0) {
-		err = errno;
+		err = -errno;
 		goto close;
 	}
 
 	if (fstat(fd, &st) < 0) {
-		err = errno;
+		err = -errno;
 		goto unlock;
 	}
 
@@ -327,26 +327,26 @@ static char *read_key(const char *pathname, const char *key, int icase)
 
 	map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
 	if (!map || map == MAP_FAILED) {
-		err = errno;
+		err = -errno;
 		goto unlock;
 	}
 
 	len = strlen(key);
 	off = find_key(map, size, key, len, icase);
 	if (!off) {
-		err = EILSEQ;
+		err = -EILSEQ;
 		goto unmap;
 	}
 
 	end = strnpbrk(off, size - (map - off), "\r\n");
 	if (!end) {
-		err = EILSEQ;
+		err = -EILSEQ;
 		goto unmap;
 	}
 
 	str = malloc(end - off - len);
 	if (!str) {
-		err = EILSEQ;
+		err = -EILSEQ;
 		goto unmap;
 	}
 
@@ -361,7 +361,7 @@ unlock:
 
 close:
 	close(fd);
-	errno = err;
+	errno = -err;
 
 	return str;
 }
@@ -408,12 +408,12 @@ int textfile_foreach(const char *pathname, textfile_cb func, void *data)
 		return -errno;
 
 	if (flock(fd, LOCK_SH) < 0) {
-		err = errno;
+		err = -errno;
 		goto close;
 	}
 
 	if (fstat(fd, &st) < 0) {
-		err = errno;
+		err = -errno;
 		goto unlock;
 	}
 
@@ -421,7 +421,7 @@ int textfile_foreach(const char *pathname, textfile_cb func, void *data)
 
 	map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
 	if (!map || map == MAP_FAILED) {
-		err = errno;
+		err = -errno;
 		goto unlock;
 	}
 
@@ -430,7 +430,7 @@ int textfile_foreach(const char *pathname, textfile_cb func, void *data)
 	while (size - (off - map) > 0) {
 		end = strnpbrk(off, size - (off - map), " ");
 		if (!end) {
-			err = EILSEQ;
+			err = -EILSEQ;
 			break;
 		}
 
@@ -438,7 +438,7 @@ int textfile_foreach(const char *pathname, textfile_cb func, void *data)
 
 		key = malloc(len + 1);
 		if (!key) {
-			err = errno;
+			err = -errno;
 			break;
 		}
 
@@ -448,14 +448,14 @@ int textfile_foreach(const char *pathname, textfile_cb func, void *data)
 		off = end + 1;
 
 		if (size - (off - map) < 0) {
-			err = EILSEQ;
+			err = -EILSEQ;
 			free(key);
 			break;
 		}
 
 		end = strnpbrk(off, size - (off - map), "\r\n");
 		if (!end) {
-			err = EILSEQ;
+			err = -EILSEQ;
 			free(key);
 			break;
 		}
@@ -464,7 +464,7 @@ int textfile_foreach(const char *pathname, textfile_cb func, void *data)
 
 		value = malloc(len + 1);
 		if (!value) {
-			err = errno;
+			err = -errno;
 			free(key);
 			break;
 		}
@@ -487,7 +487,7 @@ unlock:
 
 close:
 	close(fd);
-	errno = err;
+	errno = -err;
 
 	return 0;
 }
-- 
1.7.0.4

[PATCH BlueZ 10/17] sdp-client: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 src/sdp-client.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/sdp-client.c b/src/sdp-client.c
index ebd760e..f119313 100644
--- a/src/sdp-client.c
+++ b/src/sdp-client.c
@@ -217,22 +217,22 @@ static gboolean connect_watch(GIOChannel *chan, GIOCondition cond,
 	sdp_list_t *search, *attrids;
 	uint32_t range = 0x0000ffff;
 	socklen_t len;
-	int sk, err = 0;
+	int sk, err, sk_err = 0;
 
 	sk = g_io_channel_unix_get_fd(chan);
 	ctxt->io_id = 0;
 
-	len = sizeof(err);
-	if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &err, &len) < 0) {
-		err = errno;
-		goto failed;
-	}
+	len = sizeof(sk_err);
+	if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &sk_err, &len) < 0)
+		err = -errno;
+	else
+		err = -sk_err;
 
 	if (err != 0)
 		goto failed;
 
 	if (sdp_set_notify(ctxt->session, search_completed_cb, ctxt) < 0) {
-		err = EIO;
+		err = -EIO;
 		goto failed;
 	}
 
@@ -242,7 +242,7 @@ static gboolean connect_watch(GIOChannel *chan, GIOCondition cond,
 				search, SDP_ATTR_REQ_RANGE, attrids) < 0) {
 		sdp_list_free(attrids, NULL);
 		sdp_list_free(search, NULL);
-		err = EIO;
+		err = -EIO;
 		goto failed;
 	}
 
@@ -260,7 +260,7 @@ failed:
 	ctxt->session = NULL;
 
 	if (ctxt->cb)
-		ctxt->cb(NULL, -err, ctxt->user_data);
+		ctxt->cb(NULL, err, ctxt->user_data);
 
 	search_context_cleanup(ctxt);
 
-- 
1.7.0.4

[PATCH BlueZ 11/17] sap-u8500: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 sap/sap-u8500.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/sap/sap-u8500.c b/sap/sap-u8500.c
index e699fd7..ef7d95c 100644
--- a/sap/sap-u8500.c
+++ b/sap/sap-u8500.c
@@ -571,9 +571,9 @@ static int simd_connect(void *sap_data)
 
 	sock = socket(PF_UNIX, SOCK_STREAM, 0);
 	if (sock < 0) {
-		err = errno;
-		sap_error("creating socket failed: %s", strerror(err));
-		return -err;
+		err = -errno;
+		sap_error("creating socket failed: %s", strerror(-err));
+		return err;
 	}
 
 	memset(&addr, 0, sizeof(addr));
@@ -581,14 +581,14 @@ static int simd_connect(void *sap_data)
 	memcpy(addr.sun_path, STE_SIMD_SOCK, sizeof(STE_SIMD_SOCK) - 1);
 
 	if (connect(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		err = errno;
-		sap_error("connect to the socket failed: %s", strerror(err));
+		err = -errno;
+		sap_error("connect to the socket failed: %s", strerror(-err));
 		goto failed;
 	}
 
 	if (fcntl(sock, F_SETFL, O_NONBLOCK) > 0) {
-		err = errno;
-		sap_error("setting up socket failed: %s", strerror(err));
+		err = -errno;
+		sap_error("setting up socket failed: %s", strerror(-err));
 		goto failed;
 	}
 
@@ -598,7 +598,7 @@ static int simd_connect(void *sap_data)
 
 failed:
 	close(sock);
-	return -err;
+	return err;
 }
 
 void sap_connect_req(void *sap_device, uint16_t maxmsgsize)
-- 
1.7.0.4

[PATCH BlueZ 12/17] network: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 network/common.c |   24 ++++++++++++------------
 1 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/network/common.c b/network/common.c
index 6da9f0a..c498c25 100644
--- a/network/common.c
+++ b/network/common.c
@@ -108,10 +108,10 @@ int bnep_init(void)
 	ctl = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_BNEP);
 
 	if (ctl < 0) {
-		int err = errno;
+		int err = -errno;
 		error("Failed to open control socket: %s (%d)",
-						strerror(err), err);
-		return -err;
+						strerror(-err), -err);
+		return err;
 	}
 
 	return 0;
@@ -131,10 +131,10 @@ int bnep_kill_connection(bdaddr_t *dst)
 	baswap((bdaddr_t *)&req.dst, dst);
 	req.flags = 0;
 	if (ioctl(ctl, BNEPCONNDEL, &req)) {
-		int err = errno;
+		int err = -errno;
 		error("Failed to kill connection: %s (%d)",
-						strerror(err), err);
-		return -err;
+						strerror(-err), -err);
+		return err;
 	}
 	return 0;
 }
@@ -150,10 +150,10 @@ int bnep_kill_all_connections(void)
 	req.cnum = 7;
 	req.ci   = ci;
 	if (ioctl(ctl, BNEPGETCONNLIST, &req)) {
-		err = errno;
+		err = -errno;
 		error("Failed to get connection list: %s (%d)",
-						strerror(err), err);
-		return -err;
+						strerror(-err), -err);
+		return err;
 	}
 
 	for (i = 0; i < req.cnum; i++) {
@@ -177,10 +177,10 @@ int bnep_connadd(int sk, uint16_t role, char *dev)
 	req.sock = sk;
 	req.role = role;
 	if (ioctl(ctl, BNEPCONNADD, &req) < 0) {
-		int err = errno;
+		int err = -errno;
 		error("Failed to add device %s: %s(%d)",
-				dev, strerror(err), err);
-		return -err;
+				dev, strerror(-err), -err);
+		return err;
 	}
 
 	strncpy(dev, req.device, 16);
-- 
1.7.0.4

[PATCH BlueZ 13/17] input: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.

Also remove a few unnecessary errno assignments.
---
 input/device.c |   43 +++++++++++++++++++------------------------
 1 files changed, 19 insertions(+), 24 deletions(-)

diff --git a/input/device.c b/input/device.c
index 16eb155..a1ecdd7 100644
--- a/input/device.c
+++ b/input/device.c
@@ -164,10 +164,10 @@ static int uinput_create(char *name)
 		if (fd < 0) {
 			fd = open("/dev/misc/uinput", O_RDWR);
 			if (fd < 0) {
-				err = errno;
+				err = -errno;
 				error("Can't open input device: %s (%d)",
-							strerror(err), err);
-				return -err;
+							strerror(-err), -err);
+				return err;
 			}
 		}
 	}
@@ -182,12 +182,11 @@ static int uinput_create(char *name)
 	dev.id.version = 0x0000;
 
 	if (write(fd, &dev, sizeof(dev)) < 0) {
-		err = errno;
+		err = -errno;
 		error("Can't write device information: %s (%d)",
-						strerror(err), err);
+						strerror(-err), -err);
 		close(fd);
-		errno = err;
-		return -err;
+		return err;
 	}
 
 	ioctl(fd, UI_SET_EVBIT, EV_KEY);
@@ -200,12 +199,11 @@ static int uinput_create(char *name)
 	ioctl(fd, UI_SET_KEYBIT, KEY_PAGEDOWN);
 
 	if (ioctl(fd, UI_DEV_CREATE, NULL) < 0) {
-		err = errno;
+		err = -errno;
 		error("Can't create uinput device: %s (%d)",
-						strerror(err), err);
+						strerror(-err), -err);
 		close(fd);
-		errno = err;
-		return -err;
+		return err;
 	}
 
 	return fd;
@@ -333,9 +331,11 @@ static void rfcomm_connect_cb(GIOChannel *chan, GError *err, gpointer user_data)
 	 */
 	fake->uinput = uinput_create(idev->name);
 	if (fake->uinput < 0) {
+		int err = fake->uinput;
+
 		g_io_channel_shutdown(chan, TRUE, NULL);
 		reply = btd_error_failed(iconn->pending_connect,
-							strerror(errno));
+							strerror(-err));
 		goto failed;
 	}
 
@@ -534,11 +534,11 @@ static int ioctl_connadd(struct hidp_connadd_req *req)
 		return -errno;
 
 	if (ioctl(ctl, HIDPCONNADD, req) < 0)
-		err = errno;
+		err = -errno;
 
 	close(ctl);
 
-	return -err;
+	return err;
 }
 
 static void encrypt_completed(uint8_t status, gpointer user_data)
@@ -680,7 +680,7 @@ static int connection_disconnect(struct input_conn *iconn, uint32_t flags)
 	struct fake_input *fake = iconn->fake;
 	struct hidp_conndel_req req;
 	struct hidp_conninfo ci;
-	int ctl, err;
+	int ctl, err = 0;
 
 	/* Fake input disconnect */
 	if (fake) {
@@ -706,7 +706,7 @@ static int connection_disconnect(struct input_conn *iconn, uint32_t flags)
 	bacpy(&ci.bdaddr, &idev->dst);
 	if ((ioctl(ctl, HIDPGETCONNINFO, &ci) < 0) ||
 				(ci.state != BT_CONNECTED)) {
-		errno = ENOTCONN;
+		err = -ENOTCONN;
 		goto fail;
 	}
 
@@ -714,21 +714,16 @@ static int connection_disconnect(struct input_conn *iconn, uint32_t flags)
 	bacpy(&req.bdaddr, &idev->dst);
 	req.flags = flags;
 	if (ioctl(ctl, HIDPCONNDEL, &req) < 0) {
+		err = -errno;
 		error("Can't delete the HID device: %s(%d)",
-				strerror(errno), errno);
+				strerror(-err), -err);
 		goto fail;
 	}
 
-	close(ctl);
-
-	return 0;
-
 fail:
-	err = errno;
 	close(ctl);
-	errno = err;
 
-	return -err;
+	return err;
 }
 
 static int disconnect(struct input_device *idev, uint32_t flags)
-- 
1.7.0.4

[PATCH BlueZ 14/17] btio: Fix errno handling convention

[Anderson Lizardo]

Variables which are assigned to the errno variable (usually called
"err") should be negative, and "-err" should be used where a positive
value is needed.
---
 btio/btio.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/btio/btio.c b/btio/btio.c
index 6db1756..a129bf9 100644
--- a/btio/btio.c
+++ b/btio/btio.c
@@ -153,16 +153,18 @@ static gboolean connect_cb(GIOChannel *io, GIOCondition cond,
 		return FALSE;
 
 	if (cond & G_IO_OUT) {
-		int err = 0, sock = g_io_channel_unix_get_fd(io);
-		socklen_t len = sizeof(err);
+		int err, sk_err = 0, sock = g_io_channel_unix_get_fd(io);
+		socklen_t len = sizeof(sk_err);
 
-		if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &len) < 0)
-			err = errno;
+		if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &sk_err, &len) < 0)
+			err = -errno;
+		else
+			err = -sk_err;
 
-		if (err)
+		if (err < 0)
 			g_set_error(&gerr, BT_IO_ERROR,
 					BT_IO_ERROR_CONNECT_FAILED, "%s (%d)",
-					strerror(err), err);
+					strerror(-err), -err);
 	} else if (cond & (G_IO_HUP | G_IO_ERR))
 		g_set_error(&gerr, BT_IO_ERROR, BT_IO_ERROR_CONNECT_FAILED,
 				"HUP or ERR on socket");
-- 
1.7.0.4

[PATCH BlueZ 15/17] bccmd: Fix overwriting errno value

[Anderson Lizardo]

On error, transport_read() returns -1 and sets errno.
---
 tools/bccmd.c |   32 ++++++++------------------------
 1 files changed, 8 insertions(+), 24 deletions(-)

diff --git a/tools/bccmd.c b/tools/bccmd.c
index ca9302c..952bf13 100644
--- a/tools/bccmd.c
+++ b/tools/bccmd.c
@@ -253,10 +253,8 @@ static int cmd_builddef(int transport, int argc, char *argv[])
 		array[1] = def >> 8;
 
 		err = transport_read(transport, CSR_VARID_GET_NEXT_BUILDDEF, array, 8);
-		if (err < 0) {
-			errno = -err;
+		if (err < 0)
 			break;
-		}
 
 		nextdef = array[2] | (array[3] << 8);
 
@@ -286,10 +284,8 @@ static int cmd_keylen(int transport, int argc, char *argv[])
 	array[1] = handle >> 8;
 
 	err = transport_read(transport, CSR_VARID_CRYPT_KEY_LENGTH, array, 8);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	handle = array[0] | (array[1] << 8);
 	keylen = array[2] | (array[3] << 8);
@@ -310,10 +306,8 @@ static int cmd_clock(int transport, int argc, char *argv[])
 	memset(array, 0, sizeof(array));
 
 	err = transport_read(transport, CSR_VARID_BT_CLOCK, array, 8);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	clock = array[2] | (array[3] << 8) | (array[0] << 16) | (array[1] << 24);
 
@@ -333,10 +327,8 @@ static int cmd_rand(int transport, int argc, char *argv[])
 	memset(array, 0, sizeof(array));
 
 	err = transport_read(transport, CSR_VARID_RAND, array, 8);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	rand = array[0] | (array[1] << 8);
 
@@ -357,10 +349,8 @@ static int cmd_chiprev(int transport, int argc, char *argv[])
 	memset(array, 0, sizeof(array));
 
 	err = transport_read(transport, CSR_VARID_CHIPREV, array, 8);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	rev = array[0] | (array[1] << 8);
 
@@ -417,10 +407,8 @@ static int cmd_buildname(int transport, int argc, char *argv[])
 	memset(array, 0, sizeof(array));
 
 	err = transport_read(transport, CSR_VARID_READ_BUILD_NAME, array, 128);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	for (i = 0; i < sizeof(name); i++)
 		name[i] = array[(i * 2) + 4];
@@ -441,10 +429,8 @@ static int cmd_panicarg(int transport, int argc, char *argv[])
 	memset(array, 0, sizeof(array));
 
 	err = transport_read(transport, CSR_VARID_PANIC_ARG, array, 8);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	error = array[0] | (array[1] << 8);
 
@@ -465,10 +451,8 @@ static int cmd_faultarg(int transport, int argc, char *argv[])
 	memset(array, 0, sizeof(array));
 
 	err = transport_read(transport, CSR_VARID_FAULT_ARG, array, 8);
-	if (err < 0) {
-		errno = -err;
+	if (err < 0)
 		return -1;
-	}
 
 	error = array[0] | (array[1] << 8);
 
-- 
1.7.0.4

[PATCH BlueZ 16/17] csr_bcsp: Fix missing errno attribution

[Anderson Lizardo]

do_command() is supposed to set errno if returning -1.
---
 tools/csr_bcsp.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/tools/csr_bcsp.c b/tools/csr_bcsp.c
index df247a2..7bfaf5a 100644
--- a/tools/csr_bcsp.c
+++ b/tools/csr_bcsp.c
@@ -219,6 +219,7 @@ static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t
 
 			if (timeout++ > 5000) {
 				fprintf(stderr, "Operation timed out\n");
+				errno = ETIMEDOUT;
 				return -1;
 			}
 		}
-- 
1.7.0.4

[PATCH BlueZ 17/17] Fix return value check for bt_audio_service_open()

[Anderson Lizardo]

Only negative values (namely -1) are errors for this function.
---
 audio/gstavdtpsink.c  |    2 +-
 audio/pcm_bluetooth.c |    2 +-
 test/ipctest.c        |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/audio/gstavdtpsink.c b/audio/gstavdtpsink.c
index f379469..dca9d67 100644
--- a/audio/gstavdtpsink.c
+++ b/audio/gstavdtpsink.c
@@ -1448,7 +1448,7 @@ static gboolean gst_avdtp_sink_start(GstBaseSink *basesink)
 	self->watch_id = 0;
 
 	sk = bt_audio_service_open();
-	if (sk <= 0) {
+	if (sk < 0) {
 		err = -errno;
 		GST_ERROR_OBJECT(self, "Cannot open connection to bt "
 			"audio service: %s %d", strerror(-err), -err);
diff --git a/audio/pcm_bluetooth.c b/audio/pcm_bluetooth.c
index 4d85f33..85566a3 100644
--- a/audio/pcm_bluetooth.c
+++ b/audio/pcm_bluetooth.c
@@ -1666,7 +1666,7 @@ static int bluetooth_init(struct bluetooth_data *data,
 	data->stream.fd = -1;
 
 	sk = bt_audio_service_open();
-	if (sk <= 0) {
+	if (sk < 0) {
 		err = -errno;
 		goto failed;
 	}
diff --git a/test/ipctest.c b/test/ipctest.c
index 4968443..cbfd78d 100644
--- a/test/ipctest.c
+++ b/test/ipctest.c
@@ -214,7 +214,7 @@ static int init_bt(struct userdata *u)
 	DBG("bt_audio_service_open");
 
 	u->service_fd = bt_audio_service_open();
-	if (u->service_fd <= 0) {
+	if (u->service_fd < 0) {
 		int err = -errno;
 
 		ERR("bt_audio_service_open() failed: %s (%d)", strerror(-err),
-- 
1.7.0.4

Re: [PATCH BlueZ 00/17] Fix errno handling convention

[Johan Hedberg]

Hi Lizardo,

On Wed, Nov 16, 2011, Anderson Lizardo wrote:
> This series fix various places where variables which get errno values (usually
> named "err") are not following the convention of always being negative. The
> last 3 patches are simple fixes found during this review.

All patches have been applied. Thanks.

Johan

Regarding MAP status

[Jaganath]

Hi,

May I know the current status of MAP?
Some work is going on at 
https://github.com/bulislaw/obexd-map/commits/final-backend/.
Is there any plan to upload this code base to mainstream?

Thanks,
Jaganath