fix missing SOCK_CLOEXEC in various functions that use sockets internally

src/network/getifaddrs.c

@@ -127,7 +127,7 @@ int getifaddrs(struct ifaddrs **ifap)
 	}
 	if_freenameindex(ii);
 
-	int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
+	int sock = socket(PF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP);
 	if(sock == -1) goto err2;
 	struct ifreq reqs[32]; /* arbitrary chosen boundary */
 	struct ifconf conf = {.ifc_len = sizeof reqs, .ifc_req = reqs};

src/network/if_indextoname.c

@@ -10,7 +10,7 @@ char *if_indextoname(unsigned index, char *name)
 	struct ifreq ifr;
 	int fd, r;
 
-	if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) return 0;
+	if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
 	ifr.ifr_ifindex = index;
 	r = ioctl(fd, SIOCGIFNAME, &ifr);
 	__syscall(SYS_close, fd);

src/network/if_nameindex.c

@@ -47,7 +47,7 @@ struct if_nameindex *if_nameindex()
 {
 	size_t n;
 	void *p = 0;
-	int s = socket(AF_UNIX, SOCK_DGRAM, 0);
+	int s = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
 	if (s>=0) {
 		for (n=0; (p=do_nameindex(s, n)) == (void *)-1; n++);
 		__syscall(SYS_close, s);

src/network/if_nametoindex.c

@@ -10,7 +10,7 @@ unsigned if_nametoindex(const char *name)
 	struct ifreq ifr;
 	int fd, r;
 
-	if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) return -1;
+	if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return -1;
 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
 	r = ioctl(fd, SIOCGIFINDEX, &ifr);
 	__syscall(SYS_close, fd);