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netdb.c: add a LWIP_DNS_API_HOSTENT_STORAGE option to decide to use a static set of variables (=0) or a local one (=1). In this last case, your port should provide a function "struct hostent* sys_thread_hostent( struct hostent* h)" which have to do a copy of "h" and return a pointer ont the "per-thread" copy.

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This commit is contained in:
fbernon
2007-12-05 23:00:02 +00:00
parent 8d3d08e814
commit ac10470643
2 changed files with 29 additions and 5 deletions
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28
src/api/netdb.c
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@@ -54,11 +54,18 @@ struct gethostbyname_r_helper {
int h_errno;
#endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
/* static buffer variables for lwip_gethostbyname() */
static struct hostent s_hostent;
static char *s_aliases;
static struct ip_addr s_hostent_addr;
static struct ip_addr *s_phostent_addr;
/** define "hostent" variables storage: 0 if we use a static (but unprotected)
* set of variables for lwip_gethostbyname, 1 if we use a local storage */
#ifndef LWIP_DNS_API_HOSTENT_STORAGE
#define LWIP_DNS_API_HOSTENT_STORAGE 0
#endif
/** define "hostent" variables storage */
#if LWIP_DNS_API_HOSTENT_STORAGE
#define HOSTENT_STORAGE
#else
#define HOSTENT_STORAGE static
#endif /* LWIP_DNS_API_STATIC_HOSTENT */
/**
* Returns an entry containing addresses of address family AF_INET
@@ -75,6 +82,12 @@ lwip_gethostbyname(const char *name)
err_t err;
struct ip_addr addr;
/* buffer variables for lwip_gethostbyname() */
HOSTENT_STORAGE struct hostent s_hostent;
HOSTENT_STORAGE char *s_aliases;
HOSTENT_STORAGE struct ip_addr s_hostent_addr;
HOSTENT_STORAGE struct ip_addr *s_phostent_addr;
/* query host IP address */
err = netconn_gethostbyname(name, &addr);
if (err != ERR_OK) {
@@ -115,7 +128,12 @@ lwip_gethostbyname(const char *name)
}
#endif /* DNS_DEBUG */
#if LWIP_DNS_API_HOSTENT_STORAGE
/* this function should return the "per-thread" hostent after copy from s_hostent */
return sys_thread_hostent(&s_hostent);
#else
return &s_hostent;
#endif /* LWIP_DNS_API_HOSTENT_STORAGE */
}
/**