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authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/network/getservbyport_r.c
downloadmusl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz
initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/network/getservbyport_r.c')
-rw-r--r--src/network/getservbyport_r.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/network/getservbyport_r.c b/src/network/getservbyport_r.c
new file mode 100644
index 00000000..004a6168
--- /dev/null
+++ b/src/network/getservbyport_r.c
@@ -0,0 +1,43 @@
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <string.h>
+
+int getservbyport_r(int port, const char *prots,
+ struct servent *se, char *buf, size_t buflen, struct servent **res)
+{
+ int i;
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_port = port,
+ };
+
+ /* Align buffer */
+ i = (uintptr_t)buf & sizeof(char *)-1;
+ if (!i) i = sizeof(char *);
+ if (buflen < 3*sizeof(char *)-i) {
+ errno = ERANGE;
+ return -1;
+ }
+ buf += sizeof(char *)-i;
+ buflen -= sizeof(char *)-i;
+
+ if (strcmp(prots, "tcp") && strcmp(prots, "udp")) return -1;
+
+ se->s_port = port;
+ se->s_proto = (char *)prots;
+ se->s_aliases = (void *)buf;
+ buf += 2*sizeof(char *);
+ buflen -= 2*sizeof(char *);
+ se->s_aliases[1] = 0;
+ se->s_aliases[0] = se->s_name = buf;
+
+ if (getnameinfo((void *)&sin, sizeof sin, 0, 0, buf, buflen,
+ strcmp(prots, "udp") ? 0 : NI_DGRAM) < 0) return -1;
+
+ *res = se;
+ return 0;
+}