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libs/nixio: implement optional timeout for getnameinfo() on Linux

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This commit is contained in:
Jo-Philipp Wich 2012-08-27 14:36:47 +00:00
parent d135599c51
commit c755e818c4
1 changed files with 43 additions and 1 deletions
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44
libs/nixio/src/address.c
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@ -23,6 +23,15 @@
#include <string.h>
#ifdef __linux__
#include <signal.h>
#include <setjmp.h>
#include <unistd.h>
/* setjmp() / longjmp() stuff */
static jmp_buf nixio__jump_alarm;
static void nixio__handle_alarm(int sig) { longjmp(nixio__jump_alarm, 1); }
#include <linux/netdevice.h>
/* struct net_device_stats is buggy on amd64, redefine it */
@ -271,11 +280,38 @@ static int nixio_getaddrinfo(lua_State *L) {
}
/**
* getnameinfo(address, family)
* getnameinfo(address, family[, timeout])
*/
static int nixio_getnameinfo(lua_State *L) {
const char *ip = luaL_checkstring(L, 1);
const char *family = luaL_optstring(L, 2, NULL);
#ifdef __linux__
struct sigaction sa_new, sa_old;
int timeout = luaL_optnumber(L, 3, 0);
if (timeout > 0 && timeout < 1000)
{
sa_new.sa_handler = nixio__handle_alarm;
sa_new.sa_flags = 0;
sigemptyset(&sa_new.sa_mask);
sigaction(SIGALRM, &sa_new, &sa_old);
/* user timeout exceeded */
if (setjmp(nixio__jump_alarm))
{
sigaction(SIGALRM, &sa_old, NULL);
lua_pushnil(L);
lua_pushinteger(L, EAI_AGAIN);
lua_pushstring(L, gai_strerror(EAI_AGAIN));
return 3;
}
ualarm(timeout * 1000, 0);
}
#endif
char host[NI_MAXHOST];
struct sockaddr_storage saddr;
@ -297,6 +333,12 @@ static int nixio_getnameinfo(lua_State *L) {
int res = getnameinfo((struct sockaddr *)&saddr, sizeof(saddr),
host, sizeof(host), NULL, 0, NI_NAMEREQD);
#ifdef __linux__
if (timeout > 0 && timeout < 1000)
sigaction(SIGALRM, &sa_old, NULL);
#endif
if (res) {
lua_pushnil(L);
lua_pushinteger(L, res);