Fix declared with attribute warn_unused_result errors

13 files changed, 60 insertions, 80 deletions

diff --git a/alsa/pcm_a2dp.c b/alsa/pcm_a2dp.c
index 89a53211..fef13941 100644
--- a/alsa/pcm_a2dp.c
+++ b/alsa/pcm_a2dp.c
@@ -110,7 +110,7 @@ static snd_pcm_sframes_t a2dp_transfer(snd_pcm_ioplug_t *io,
 {
 	snd_pcm_a2dp_t *a2dp = io->private_data;
 	unsigned char *buf;
-	int len;
+	int err, len;
 
 	buf = (unsigned char *) areas->addr + (areas->first + areas->step * offset) / 8;
 
@@ -119,7 +119,7 @@ static snd_pcm_sframes_t a2dp_transfer(snd_pcm_ioplug_t *io,
 		return len;
 
 	if (a2dp->len + a2dp->sbc.len > sizeof(a2dp->buf)) {
-		write(a2dp->sk, a2dp->buf, a2dp->len);
+		err = write(a2dp->sk, a2dp->buf, a2dp->len);
 		a2dp->len = 0;
 	}
 
diff --git a/cups/hcrp.c b/cups/hcrp.c
index c613b4fc..c70945be 100644
--- a/cups/hcrp.c
+++ b/cups/hcrp.c
@@ -89,7 +89,7 @@ static int hcrp_credit_grant(int sk, uint16_t tid, uint32_t credit)
 	cp.credit = credit;
 	memcpy(buf, &hdr, HCRP_PDU_HDR_SIZE);
 	memcpy(buf + HCRP_PDU_HDR_SIZE, &cp, HCRP_CREDIT_GRANT_CP_SIZE);
-	write(sk, buf, HCRP_PDU_HDR_SIZE + HCRP_CREDIT_GRANT_CP_SIZE);
+	len = write(sk, buf, HCRP_PDU_HDR_SIZE + HCRP_CREDIT_GRANT_CP_SIZE);
 
 	len = read(sk, buf, sizeof(buf));
 	memcpy(&hdr, buf, HCRP_PDU_HDR_SIZE);
@@ -114,7 +114,7 @@ static int hcrp_credit_request(int sk, uint16_t tid, uint32_t *credit)
 	hdr.tid = htons(tid);
 	hdr.plen = htons(0);
 	memcpy(buf, &hdr, HCRP_PDU_HDR_SIZE);
-	write(sk, buf, HCRP_PDU_HDR_SIZE);
+	len = write(sk, buf, HCRP_PDU_HDR_SIZE);
 
 	len = read(sk, buf, sizeof(buf));
 	memcpy(&hdr, buf, HCRP_PDU_HDR_SIZE);
@@ -142,7 +142,7 @@ static int hcrp_get_lpt_status(int sk, uint16_t tid, uint8_t *lpt_status)
 	hdr.tid = htons(tid);
 	hdr.plen = htons(0);
 	memcpy(buf, &hdr, HCRP_PDU_HDR_SIZE);
-	write(sk, buf, HCRP_PDU_HDR_SIZE);
+	len = write(sk, buf, HCRP_PDU_HDR_SIZE);
 
 	len = read(sk, buf, sizeof(buf));
 	memcpy(&hdr, buf, HCRP_PDU_HDR_SIZE);
diff --git a/cups/spp.c b/cups/spp.c
index 968cd61e..0350280b 100644
--- a/cups/spp.c
+++ b/cups/spp.c
@@ -38,7 +38,7 @@ int spp_print(bdaddr_t *src, bdaddr_t *dst, uint8_t channel, int fd, int copies)
 {
 	struct sockaddr_rc addr;
 	unsigned char buf[2048];
-	int i, sk, len;
+	int i, sk, err, len;
 
 	if ((sk = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)) < 0) {
 		perror("ERROR: Can't create socket");
@@ -87,7 +87,7 @@ int spp_print(bdaddr_t *src, bdaddr_t *dst, uint8_t channel, int fd, int copies)
 		}
 
 		while ((len = read(fd, buf, sizeof(buf))) > 0) {
-			write(sk, buf, len);
+			err = write(sk, buf, len);
 		}
 
 	}
diff --git a/dund/dun.c b/dund/dun.c
index 4fbbad69..718da7ec 100644
--- a/dund/dun.c
+++ b/dund/dun.c
@@ -98,7 +98,9 @@ static int uses_rfcomm(char *path, char *dev)
 	dir = opendir(path);
 	if (!dir)
 		return 0;
-	chdir(path);
+
+	if (chdir(path) < 0)
+		return 0;
 
 	while ((de = readdir(dir)) != NULL) {
 		char link[PATH_MAX + 1];
@@ -109,7 +111,9 @@ static int uses_rfcomm(char *path, char *dev)
 				return 1;
 		}
 	}
+
 	closedir(dir);
+
 	return 0;
 }
 
diff --git a/dund/main.c b/dund/main.c
index 249d6d7c..bb96d639 100644
--- a/dund/main.c
+++ b/dund/main.c
@@ -598,18 +598,9 @@ int main(int argc, char *argv[])
 	sa.sa_handler = sig_hup;
 	sigaction(SIGHUP, &sa, NULL);
 
-	if (detach) {
-		int fd;
-
-		if (fork()) exit(0);
-
-		/* Direct stdin,stdout,stderr to '/dev/null' */
-		fd = open("/dev/null", O_RDWR);
-		dup2(fd, 0); dup2(fd, 1); dup2(fd, 2);
-		close(fd);
-
-		setsid();
-		chdir("/");
+	if (detach && daemon(0, 0)) {
+		perror("Can't start daemon");
+		exit(1);
 	}
 
 	openlog("dund", LOG_PID | LOG_NDELAY | LOG_PERROR, LOG_DAEMON);
diff --git a/hidd/fakehid.c b/hidd/fakehid.c
index 0d87335b..138d2b48 100644
--- a/hidd/fakehid.c
+++ b/hidd/fakehid.c
@@ -47,6 +47,7 @@
 static void event(int fd, uint16_t type, uint16_t code, int32_t value)
 {
 	struct uinput_event event;
+	int len;
 
 	if (fd <= fileno(stderr))
 		return;
@@ -56,7 +57,7 @@ static void event(int fd, uint16_t type, uint16_t code, int32_t value)
 	event.code = code;
 	event.value = value;
 
-	write(fd, &event, sizeof(event));
+	len = write(fd, &event, sizeof(event));
 }
 
 static void func(int fd)
diff --git a/hidd/main.c b/hidd/main.c
index 6ccbf0bc..b684cac7 100644
--- a/hidd/main.c
+++ b/hidd/main.c
@@ -638,8 +638,8 @@ int main(int argc, char *argv[])
 	uint8_t subclass = 0x00;
 	char addr[18];
 	int log_option = LOG_NDELAY | LOG_PID;
-	int opt, fd, ctl, csk, isk;
-	int mode = SHOW, daemon = 1, nosdp = 0, nocheck = 0, bootonly = 0;
+	int opt, ctl, csk, isk;
+	int mode = SHOW, detach = 1, nosdp = 0, nocheck = 0, bootonly = 0;
 	int fakehid = 1, encrypt = 0, timeout = 30, lm = 0;
 
 	bacpy(&bdaddr, BDADDR_ANY);
@@ -653,7 +653,7 @@ int main(int argc, char *argv[])
 				str2ba(optarg, &bdaddr);
 			break;
 		case 'n':
-			daemon = 0;
+			detach = 0;
 			break;
 		case 't':
 			timeout = atoi(optarg);
@@ -760,16 +760,11 @@ int main(int argc, char *argv[])
 		exit(0);
 	}
 
-	if (daemon) {
-		if (fork())
-			exit(0);
-
-		fd = open("/dev/null", O_RDWR);
-		dup2(fd, 0); dup2(fd, 1); dup2(fd, 2);
-		close(fd);
-
-		setsid();
-		chdir("/");
+        if (detach) {
+		if (daemon(0, 0)) {
+			perror("Can't start daemon");
+        	        exit(1);
+		}
 	} else
 		log_option |= LOG_PERROR;
 
diff --git a/pand/main.c b/pand/main.c
index 50b355b6..fd77e4ab 100644
--- a/pand/main.c
+++ b/pand/main.c
@@ -443,7 +443,7 @@ static int write_pidfile(void)
 		if (fd == -1) {
 			/* Try to open the file for read. */
 			fd = open(pidfile, O_RDONLY);
-			if(fd == -1) {
+			if (fd < 0) {
 				syslog(LOG_ERR, "Could not read old pidfile: %s(%d)",
 							strerror(errno), errno);
 				return -1;
@@ -464,7 +464,8 @@ static int write_pidfile(void)
 			}
 
 			pid = 0;
-			fscanf(f, "%d", &pid);
+			if (fscanf(f, "%d", &pid) != 1)
+				pid = 0;
 			fclose(f);
 
 			if (pid) {
@@ -706,19 +707,9 @@ int main(int argc, char *argv[])
 	sigaction(SIGTERM, &sa, NULL);
 	sigaction(SIGINT,  &sa, NULL);
 
-	if (detach) {
-		if (fork())
-			exit(0);
-
-		/* Direct stdin,stdout,stderr to '/dev/null' */
-		{
-			int fd = open("/dev/null", O_RDWR);
-			dup2(fd, 0); dup2(fd, 1); dup2(fd, 2);
-			close(fd);
-		}
-
-		setsid();
-		chdir("/");
+	if (detach && daemon(0, 0)) {
+		perror("Can't start daemon");
+		exit(1);
 	}
 
 	openlog("pand", LOG_PID | LOG_NDELAY | LOG_PERROR, LOG_DAEMON);
diff --git a/test/attest.c b/test/attest.c
index 59ab1d29..98fdf5e7 100644
--- a/test/attest.c
+++ b/test/attest.c
@@ -45,7 +45,7 @@ static int at_command(int fd, char *cmd, int to)
 	char buf[1024];
 	int sel, len, i, n;
 
-	write(fd, cmd, strlen(cmd));
+	len = write(fd, cmd, strlen(cmd));
 
 	for (i = 0; i < 100; i++) {
 
diff --git a/test/hciemu.c b/test/hciemu.c
index d6996a3e..213ca78c 100644
--- a/test/hciemu.c
+++ b/test/hciemu.c
@@ -219,6 +219,7 @@ static int write_snoop(int fd, int type, int incoming, unsigned char *buf, int l
 	struct timeval tv;
 	uint32_t size = len;
 	uint64_t ts;
+	int err;
 
 	if (fd < 0)
 		return -1;
@@ -236,8 +237,8 @@ static int write_snoop(int fd, int type, int incoming, unsigned char *buf, int l
 	if (type == HCI_COMMAND_PKT || type == HCI_EVENT_PKT)
 		pkt.flags |= ntohl(0x02);
 
-	write(fd, &pkt, BTSNOOP_PKT_SIZE);
-	write(fd, buf, size);
+	err = write(fd, &pkt, BTSNOOP_PKT_SIZE);
+	err = write(fd, buf, size);
 
 	return 0;
 }
@@ -872,7 +873,7 @@ static gboolean io_acl_data(GIOChannel *chan, GIOCondition cond, gpointer data)
 	unsigned char buf[HCI_MAX_FRAME_SIZE], *ptr;
 	hci_acl_hdr *ah;
 	uint16_t flags;
-	int len, fd;
+	int fd, err, len;
 
 	if (cond & G_IO_NVAL)
 		return FALSE;
@@ -907,7 +908,7 @@ static gboolean io_acl_data(GIOChannel *chan, GIOCondition cond, gpointer data)
 
 	write_snoop(vdev.dd, HCI_ACLDATA_PKT, 1, buf, len);
 
-	write(vdev.fd, buf, len);
+	err = write(vdev.fd, buf, len);
 
 	return TRUE;
 }
@@ -1137,7 +1138,7 @@ static int run_proxy(int fd, int dev, bdaddr_t *bdaddr)
 			len = read(fd, buf, sizeof(buf));
 			if (len > 0) {
 				rewrite_bdaddr(buf, len, bdaddr);
-				write(dd, buf, len);
+				err = write(dd, buf, len);
 			}
 		}
 
@@ -1145,7 +1146,7 @@ static int run_proxy(int fd, int dev, bdaddr_t *bdaddr)
 			len = read(dd, buf, sizeof(buf));
 			if (len > 0) {
 				rewrite_bdaddr(buf, len, bdaddr);
-				write(fd, buf, len);
+				err = write(fd, buf, len);
 			}
 		}
 	}
@@ -1185,13 +1186,10 @@ int main(int argc, char *argv[])
 	GIOChannel *dev_io;
 	char *device = NULL, *snoop = NULL;
 	bdaddr_t bdaddr;
-	int fd, dd, opt, daemon, dofork, dev = -1;
+	int fd, dd, opt, detach = 1, dev = -1;
 
 	bacpy(&bdaddr, BDADDR_ANY);
 
-	/* Configure default settings */
-	daemon = 1; dofork = 1;
-
 	while ((opt=getopt_long(argc, argv, "d:b:s:nh", main_options, NULL)) != EOF) {
 		switch(opt) {
 		case 'd':
@@ -1207,7 +1205,7 @@ int main(int argc, char *argv[])
 			break;
 
 		case 'n':
-			daemon = 0;
+			detach = 0;
 			break;
 
 		case 'h':
@@ -1237,18 +1235,11 @@ int main(int argc, char *argv[])
 			exit(1);
 	}
 
-	if (daemon) {
-		if (dofork && fork())
-			exit(0);
-
-		/* Direct stdin,stdout,stderr to '/dev/null' */
-		fd = open("/dev/null", O_RDWR);
-		dup2(fd, 0); dup2(fd, 1); dup2(fd, 2);
-		close(fd);
-
-		setsid();
-
-		chdir("/");
+	if (detach) {
+		if (daemon(0, 0)) {
+			perror("Can't start daemon");
+			exit(1);
+		}
 	}
 
 	/* Start logging to syslog and stderr */
diff --git a/test/hstest.c b/test/hstest.c
index cda9101c..d94ade20 100644
--- a/test/hstest.c
+++ b/test/hstest.c
@@ -159,7 +159,7 @@ int main(int argc, char *argv[])
 
 	char *filename;
 	mode_t filemode;
-	int mode = 0;
+	int err, mode = 0;
 	int dd, rd, sd, fd;
 	uint16_t sco_handle, sco_mtu, vs;
 
@@ -245,7 +245,7 @@ int main(int argc, char *argv[])
 	fprintf(stderr, "SCO audio channel connected (handle %d, mtu %d)\n", sco_handle, sco_mtu);
 
 	if (mode == RECORD)
-		write(rd, "RING\r\n", 6);
+		err = write(rd, "RING\r\n", 6);
 
 	maxfd = (rd > sd) ? rd : sd;
 
diff --git a/tools/csr_bcsp.c b/tools/csr_bcsp.c
index 77766114..29a60bf9 100644
--- a/tools/csr_bcsp.c
+++ b/tools/csr_bcsp.c
@@ -136,7 +136,8 @@ int csr_open_bcsp(char *device)
 
 void put_uart(uint8_t ch)
 {
-	write(fd, &ch, 1);
+	if (write(fd, &ch, 1) < 0)
+		fprintf(stderr, "UART write error\n");
 }
 
 uint8_t get_uart(uint8_t *ch)
diff --git a/tools/dfutool.c b/tools/dfutool.c
index 8d5e9194..6bf65639 100644
--- a/tools/dfutool.c
+++ b/tools/dfutool.c
@@ -166,7 +166,8 @@ static struct usb_dev_handle *open_device(char *device, struct dfu_suffix *suffi
 		printf("\rSelect device (abort with 0): ");
 		fflush(stdout);
 		memset(str, 0, sizeof(str));
-		fgets(str, sizeof(str) - 1, stdin);
+		if (!fgets(str, sizeof(str) - 1, stdin))
+			continue;
 		sel = atoi(str);
 	} while (!isdigit(str[0]) || sel < 0 || sel > num );
 
@@ -666,8 +667,12 @@ static void cmd_archive(char *device, int argc, char **argv)
 		for (i = 0; i < len; i++)
 			crc = crc32_byte(crc, buf[i]);
 
-		if (len > 0)
-			write(fd, buf, len);
+		if (len > 0) {
+			if (write(fd, buf, len) < 0) {
+				printf("\rCan't write next block: %s (%d)\n", strerror(errno), errno);
+				goto done;
+			}
+		}
 
 		n++;
 		if (len != 1023)
@@ -687,7 +692,8 @@ static void cmd_archive(char *device, int argc, char **argv)
 
 	suffix.dwCRC = cpu_to_le32(crc);
 
-	write(fd, &suffix, DFU_SUFFIX_SIZE);
+	if (write(fd, &suffix, DFU_SUFFIX_SIZE) < 0)
+		printf("Can't write suffix block: %s (%d)\n", strerror(errno), errno);
 
 done:
 	close(fd);