Clean up compiler warnings from overly pedantic checking.

4 files changed, 20 insertions, 11 deletions

diff --git a/bind.c b/bind.c
index 1b34ffd6..483c7462 100644
--- a/bind.c
+++ b/bind.c
@@ -79,7 +79,8 @@ daemonise(void)
 			setsid();
 			/* Notify parent it's safe to exit as we've detached. */
 			close(sidpipe[0]);
-			write(sidpipe[1], &buf, 1);
+			if (write(sidpipe[1], &buf, 1) == -1)
+				syslog(LOG_ERR, "failed to notify parent: %m");
 			close(sidpipe[1]);
 			if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
 				dup2(fd, STDIN_FILENO);
@@ -93,7 +94,8 @@ daemonise(void)
 			signal_reset();
 			/* Wait for child to detach */
 			close(sidpipe[1]);
-			read(sidpipe[0], &buf, 1);
+			if (read(sidpipe[0], &buf, 1) == -1)
+				syslog(LOG_ERR, "failed to read child: %m");
 			close(sidpipe[0]);
 			break;
 	}
diff --git a/common.c b/common.c
index 71f4e805..48f51a4e 100644
--- a/common.c
+++ b/common.c
@@ -94,7 +94,8 @@ again:
 		}
 		p = lbuf + last;
 		memset(p, 0, BUFSIZ);
-		fgets(p, BUFSIZ, fp);
+		if (fgets(p, BUFSIZ, fp) == NULL)
+			break;
 		last += strlen(p);
 		if (last != 0 && lbuf[last - 1] == '\n') {
 			lbuf[last - 1] = '\0';
diff --git a/dhcpcd.c b/dhcpcd.c
index 8004534a..f0aaf1bc 100644
--- a/dhcpcd.c
+++ b/dhcpcd.c
@@ -116,16 +116,15 @@ static pid_t
 read_pid(void)
 {
 	FILE *fp;
-	pid_t pid = 0;
+	pid_t pid;
 
 	if ((fp = fopen(pidfile, "r")) == NULL) {
 		errno = ENOENT;
 		return 0;
 	}
-
-	fscanf(fp, "%d", &pid);
+	if (fscanf(fp, "%d", &pid) != 1)
+		pid = 0;
 	fclose(fp);
-
 	return pid;
 }
 
@@ -1141,7 +1140,9 @@ handle_args(struct fd_list *fd, int argc, char **argv)
 			if (argc == 1) {
 				for (ifp = ifaces; ifp; ifp = ifp->next)
 					len++;
-				write(fd->fd, &len, sizeof(len));
+				len = write(fd->fd, &len, sizeof(len));
+				if (len != sizeof(len))
+					return -1;
 				for (ifp = ifaces; ifp; ifp = ifp->next)
 					send_interface(fd->fd, ifp);
 				return 0;
@@ -1152,7 +1153,9 @@ handle_args(struct fd_list *fd, int argc, char **argv)
 					if (strcmp(argv[opt], ifp->name) == 0)
 						len++;
 			}
-			write(fd->fd, &len, sizeof(len));
+			len = write(fd->fd, &len, sizeof(len));
+			if (len != sizeof(len))
+				return -1;
 			opt = 0;
 			while (argv[++opt] != NULL) {
 				for (ifp = ifaces; ifp; ifp = ifp->next)
@@ -1321,7 +1324,8 @@ main(int argc, char **argv)
 		options |= DHCPCD_MASTER;
 	}
 
-	chdir("/");
+	if (chdir("/") == -1)
+		syslog(LOG_ERR, "failed to chdir to /: %m");
 	umask(022);
 	atexit(cleanup);
 
diff --git a/signals.c b/signals.c
index 64831fae..0007b5d2 100644
--- a/signals.c
+++ b/signals.c
@@ -31,6 +31,7 @@
 #include <errno.h>
 #include <signal.h>
 #include <string.h>
+#include <syslog.h>
 #include <unistd.h>
 
 #include "common.h"
@@ -51,7 +52,8 @@ signal_handler(int sig)
 {
 	int serrno = errno;
 
-	write(signal_pipe[1], &sig, sizeof(sig));
+	if (write(signal_pipe[1], &sig, sizeof(sig)) != sizeof(sig))
+		syslog(LOG_ERR, "failed to write signal %d: %m", sig);
 	/* Restore errno */
 	errno = serrno;
 }