diff options
author | Eric Andersen <andersen@codepoet.org> | 2002-08-06 14:47:12 +0000 |
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committer | Eric Andersen <andersen@codepoet.org> | 2002-08-06 14:47:12 +0000 |
commit | 0a2d7c0bb713079a668162883e5ccdacf92f4beb (patch) | |
tree | 4c199712af0088255cef243d0eca620606845ca8 /libc/inet/resolv.c | |
parent | 17a1a692cb64c4b56a5c86e35f8abed121bc758b (diff) |
Fixup the last missing pieces of thread locking
-Erik
Diffstat (limited to 'libc/inet/resolv.c')
-rw-r--r-- | libc/inet/resolv.c | 102 |
1 files changed, 80 insertions, 22 deletions
diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c index 177424d51..4651896a5 100644 --- a/libc/inet/resolv.c +++ b/libc/inet/resolv.c @@ -83,12 +83,22 @@ #endif /* DEBUG */ -/* Global stuff... */ +/* Global stuff (stuff needing to be locked to be thread safe)... */ extern int __nameservers; extern char * __nameserver[MAX_SERVERS]; extern int __searchdomains; extern char * __searchdomain[MAX_SEARCH]; +#ifdef __UCLIBC_HAS_THREADS__ +#include <pthread.h> +extern pthread_mutex_t __resolv_lock; +# define BIGLOCK pthread_mutex_lock(&__resolv_lock) +# define BIGUNLOCK pthread_mutex_unlock(&__resolv_lock); +#else +# define BIGLOCK +# define BIGUNLOCK +#endif + /* Structs */ @@ -573,7 +583,6 @@ int __connect_dns(char *nsip) #ifdef L_dnslookup #ifdef __UCLIBC_HAS_THREADS__ -#include <pthread.h> static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER; # define LOCK pthread_mutex_lock(&mylock) # define UNLOCK pthread_mutex_unlock(&mylock); @@ -636,11 +645,13 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip, goto fail; strncpy(lookup,name,MAXDNAME); + BIGLOCK; if (variant < __searchdomains && strchr(lookup, '.') == NULL) { strncat(lookup,".", MAXDNAME); strncat(lookup,__searchdomain[variant], MAXDNAME); } + BIGUNLOCK; DPRINTF("lookup name: %s\n", lookup); q.dotted = (char *)lookup; q.qtype = type; @@ -755,21 +766,35 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip, tryall: /* if there are other nameservers, give them a go, otherwise return with error */ - variant = 0; - if (retries >= nscount*(__searchdomains+1)) - goto fail; + { + int sdomains; + + BIGLOCK; + sdomains=__searchdomains; + BIGUNLOCK; + variant = 0; + if (retries >= nscount*(sdomains+1)) + goto fail; + } again: /* if there are searchdomains, try them or fallback as passed */ - if (variant < __searchdomains) { - /* next search */ - variant++; - } else { - /* next server, first search */ - LOCK; - ns = (ns + 1) % nscount; - UNLOCK; - variant = 0; + { + int sdomains; + BIGLOCK; + sdomains=__searchdomains; + BIGUNLOCK; + + if (variant < sdomains) { + /* next search */ + variant++; + } else { + /* next server, first search */ + LOCK; + ns = (ns + 1) % nscount; + UNLOCK; + variant = 0; + } } } @@ -786,11 +811,13 @@ fail: #ifdef L_opennameservers -#warning fixme -- __nameserver, __nameservers, __searchdomain, and __searchdomains need locking int __nameservers; char * __nameserver[MAX_SERVERS]; int __searchdomains; char * __searchdomain[MAX_SEARCH]; +#ifdef __UCLIBC_HAS_THREADS__ +pthread_mutex_t __resolv_lock = PTHREAD_MUTEX_INITIALIZER; +#endif /* * we currently read formats not quite the same as that on normal @@ -805,8 +832,11 @@ int __open_nameservers() char szBuffer[128], *p, *argv[RESOLV_ARGS]; int argc; - if (__nameservers > 0) + BIGLOCK; + if (__nameservers > 0) { + BIGUNLOCK; return 0; + } if ((fp = fopen("/etc/resolv.conf", "r")) || (fp = fopen("/etc/config/resolv.conf", "r"))) { @@ -850,6 +880,7 @@ int __open_nameservers() DPRINTF("failed to open %s\n", "resolv.conf"); } DPRINTF("nameservers = %d\n", __nameservers); + BIGUNLOCK; return 0; } #endif @@ -859,6 +890,7 @@ int __open_nameservers() void __close_nameservers(void) { + BIGLOCK; while (__nameservers > 0) { free(__nameserver[--__nameservers]); __nameserver[__nameservers] = NULL; @@ -867,6 +899,7 @@ void __close_nameservers(void) free(__searchdomain[--__searchdomains]); __searchdomain[__searchdomains] = NULL; } + BIGUNLOCK; } #endif @@ -955,6 +988,7 @@ int res_init(void) /** rp->rhook = NULL; **/ /** rp->_u._ext.nsinit = 0; **/ + BIGLOCK; if(__searchdomains) { int i; for(i=0; i<__searchdomains; i++) { @@ -974,6 +1008,7 @@ int res_init(void) } } rp->nscount = __nameservers; + BIGUNLOCK; return(0); } @@ -1007,9 +1042,11 @@ void res_close( void ) int res_query(const char *dname, int class, int type, unsigned char *answer, int anslen) { + int i; unsigned char * packet = 0; struct resolv_answer a; - int i; + int __nameserversXX; + char ** __nameserverXX; __open_nameservers(); @@ -1018,7 +1055,11 @@ int res_query(const char *dname, int class, int type, memset((char *) &a, '\0', sizeof(a)); - i = __dns_lookup(dname, type, __nameservers, __nameserver, &packet, &a); + BIGLOCK; + __nameserversXX=__nameservers; + __nameserverXX=__nameserver; + BIGUNLOCK; + i = __dns_lookup(dname, type, __nameserversXX, __nameserverXX, &packet, &a); if (i < 0) return(-1); @@ -1215,7 +1256,6 @@ int __read_etc_hosts_r(FILE * fp, const char * name, int type, #ifdef L_gethostent #ifdef __UCLIBC_HAS_THREADS__ -#include <pthread.h> static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER; # define LOCK pthread_mutex_lock(&mylock) # define UNLOCK pthread_mutex_unlock(&mylock); @@ -1532,6 +1572,8 @@ int gethostbyname_r(const char * name, struct resolv_answer a; int i; int nest = 0; + int __nameserversXX; + char ** __nameserverXX; __open_nameservers(); @@ -1591,7 +1633,11 @@ int gethostbyname_r(const char * name, for (;;) { - i = __dns_lookup(buf, T_A, __nameservers, __nameserver, &packet, &a); + BIGLOCK; + __nameserversXX=__nameservers; + __nameserverXX=__nameserver; + BIGUNLOCK; + i = __dns_lookup(buf, T_A, __nameserversXX, __nameserverXX, &packet, &a); if (i < 0) { *h_errnop = HOST_NOT_FOUND; @@ -1665,6 +1711,8 @@ int gethostbyname2_r(const char *name, int family, struct resolv_answer a; int i; int nest = 0; + int __nameserversXX; + char ** __nameserverXX; if (family == AF_INET) return gethostbyname_r(name, result_buf, buf, buflen, result, h_errnop); @@ -1724,8 +1772,12 @@ int gethostbyname2_r(const char *name, int family, } for (;;) { + BIGLOCK; + __nameserversXX=__nameservers; + __nameserverXX=__nameserver; + BIGUNLOCK; - i = __dns_lookup(buf, T_AAAA, __nameservers, __nameserver, &packet, &a); + i = __dns_lookup(buf, T_AAAA, __nameserversXX, __nameserverXX, &packet, &a); if (i < 0) { *h_errnop = HOST_NOT_FOUND; @@ -1790,6 +1842,8 @@ int gethostbyaddr_r (const void *addr, socklen_t len, int type, struct resolv_answer a; int i; int nest = 0; + int __nameserversXX; + char ** __nameserverXX; *result=NULL; if (!addr) @@ -1892,7 +1946,11 @@ int gethostbyaddr_r (const void *addr, socklen_t len, int type, for (;;) { - i = __dns_lookup(buf, T_PTR, __nameservers, __nameserver, &packet, &a); + BIGLOCK; + __nameserversXX=__nameservers; + __nameserverXX=__nameserver; + BIGUNLOCK; + i = __dns_lookup(buf, T_PTR, __nameserversXX, __nameserverXX, &packet, &a); if (i < 0) { *h_errnop = HOST_NOT_FOUND; |