From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/network/getservbyport_r.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/network/getservbyport_r.c (limited to 'src/network/getservbyport_r.c') 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 +#include +#include +#include +#include +#include + +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; +} -- cgit v1.2.1