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Retry name resolving after temporary failure few times before giving up

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This is a temporary fix to allow starting when resolv.conf is not ready yet
(e.g. when using NetworkManager). It may delay start up to 1022 seconds.
This commit is contained in:
Miroslav Lichvar
2008-11-10 14:42:41 +01:00
parent fd2641bcb9
commit 0148ecaea0
4 changed files with 32 additions and 5 deletions
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29
nameserv.c
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@@ -32,18 +32,28 @@
#include "sysincl.h"
#include "nameserv.h"
#include <resolv.h>
/* ================================================== */
unsigned long
DNS_Name2IPAddress(const char *name)
static unsigned int retries = 0;
static unsigned long
Name2IPAddress(const char *name, int retry)
{
struct hostent *host;
unsigned char *address0;
unsigned long result;
try_again:
host = gethostbyname(name);
if (host == NULL) {
if (retry && h_errno == TRY_AGAIN && retries < 10) {
sleep(2 << retries);
retries++;
res_init();
goto try_again;
}
result = DNS_Failed_Address;
} else {
address0 = host->h_addr_list[0];
@@ -54,7 +64,22 @@ DNS_Name2IPAddress(const char *name)
}
return result;
}
/* ================================================== */
unsigned long
DNS_Name2IPAddress(const char *name)
{
return Name2IPAddress(name, 0);
}
/* ================================================== */
unsigned long
DNS_Name2IPAddressRetry(const char *name)
{
return Name2IPAddress(name, 1);
}
/* ================================================== */