From 69fa44735497e10ca7c49075455da1370b7d7484 Mon Sep 17 00:00:00 2001 From: Yang Tse Date: Fri, 16 Feb 2007 15:04:44 +0000 Subject: [PATCH] use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling --- adig.c | 2 +- ares_init.c | 21 +++++++++++++-------- ares_process.c | 20 +++++++------------- inet_net_pton.c | 24 +++++++++++++++++------- inet_ntop.c | 11 ++++++++--- windows_port.c | 2 +- 6 files changed, 47 insertions(+), 33 deletions(-) diff --git a/adig.c b/adig.c index 6a23c513..32e07217 100644 --- a/adig.c +++ b/adig.c @@ -289,7 +289,7 @@ int main(int argc, char **argv) break; tvp = ares_timeout(channel, NULL, &tv); count = select(nfds, &read_fds, &write_fds, NULL, tvp); - if (count < 0 && errno != EINVAL) + if (count < 0 && SOCKERRNO != EINVAL) { perror("select"); return 1; diff --git a/ares_init.c b/ares_init.c index b0fa50f2..5268745d 100644 --- a/ares_init.c +++ b/ares_init.c @@ -610,6 +610,7 @@ DhcpNameServer char *p; FILE *fp; int linesize; + int error; fp = fopen(PATH_RESOLV_CONF, "r"); if (fp) { @@ -635,13 +636,14 @@ DhcpNameServer fclose(fp); } else { - switch(errno) { + error = ERRNO; + switch(error) { case ENOENT: status = ARES_EOF; break; default: DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - errno, strerror(errno))); + error, strerror(error))); DEBUGF(fprintf(stderr, "Error opening file: %s\n", PATH_RESOLV_CONF)); status = ARES_EFILE; } @@ -659,13 +661,14 @@ DhcpNameServer fclose(fp); } else { - switch(errno) { + error = ERRNO; + switch(error) { case ENOENT: status = ARES_EOF; break; default: DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - errno, strerror(errno))); + error, strerror(error))); DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/nsswitch.conf")); status = ARES_EFILE; } @@ -684,13 +687,14 @@ DhcpNameServer fclose(fp); } else { - switch(errno) { + error = ERRNO; + switch(error) { case ENOENT: status = ARES_EOF; break; default: DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - errno, strerror(errno))); + error, strerror(error))); DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/host.conf")); status = ARES_EFILE; } @@ -709,13 +713,14 @@ DhcpNameServer fclose(fp); } else { - switch(errno) { + error = ERRNO; + switch(error) { case ENOENT: status = ARES_EOF; break; default: DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - errno, strerror(errno))); + error, strerror(error))); DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/svc.conf")); status = ARES_EFILE; } diff --git a/ares_process.c b/ares_process.c index f6669ca9..480948eb 100644 --- a/ares_process.c +++ b/ares_process.c @@ -59,12 +59,6 @@ #define TRUE 1 #endif -#ifdef USE_WINSOCK -#define GET_ERRNO() WSAGetLastError() -#else -#define GET_ERRNO() errno -#endif - static int try_again(int errnum); static void write_tcp_data(ares_channel channel, fd_set *write_fds, time_t now); @@ -97,7 +91,7 @@ void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds) process_timeouts(channel, now); } -/* Return 1 if the specified errno describes a readiness error, or 0 +/* Return 1 if the specified error number describes a readiness error, or 0 * otherwise. This is mostly for HP-UX, which could return EAGAIN or * EWOULDBLOCK. See this man page * @@ -164,7 +158,7 @@ static void write_tcp_data(ares_channel channel, fd_set *write_fds, time_t now) free(vec); if (wcount < 0) { - if (!try_again(GET_ERRNO())) + if (!try_again(SOCKERRNO)) handle_error(channel, i, now); continue; } @@ -200,7 +194,7 @@ static void write_tcp_data(ares_channel channel, fd_set *write_fds, time_t now) scount = swrite(server->tcp_socket, sendreq->data, sendreq->len); if (scount < 0) { - if (!try_again(GET_ERRNO())) + if (!try_again(SOCKERRNO)) handle_error(channel, i, now); continue; } @@ -253,7 +247,7 @@ static void read_tcp_data(ares_channel channel, fd_set *read_fds, time_t now) 2 - server->tcp_lenbuf_pos); if (count <= 0) { - if (!(count == -1 && try_again(GET_ERRNO()))) + if (!(count == -1 && try_again(SOCKERRNO))) handle_error(channel, i, now); continue; } @@ -280,7 +274,7 @@ static void read_tcp_data(ares_channel channel, fd_set *read_fds, time_t now) server->tcp_length - server->tcp_buffer_pos); if (count <= 0) { - if (!(count == -1 && try_again(GET_ERRNO()))) + if (!(count == -1 && try_again(SOCKERRNO))) handle_error(channel, i, now); continue; } @@ -322,7 +316,7 @@ static void read_udp_packets(ares_channel channel, fd_set *read_fds, continue; count = sread(server->udp_socket, buf, sizeof(buf)); - if (count == -1 && try_again(GET_ERRNO())) + if (count == -1 && try_again(SOCKERRNO)) continue; else if (count <= 0) handle_error(channel, i, now); @@ -615,7 +609,7 @@ static int open_tcp_socket(ares_channel channel, struct server_state *server) sockin.sin_addr = server->addr; sockin.sin_port = (unsigned short)(channel->tcp_port & 0xffff); if (connect(s, (struct sockaddr *) &sockin, sizeof(sockin)) == -1) { - int err = GET_ERRNO(); + int err = SOCKERRNO; if (err != EINPROGRESS && err != EWOULDBLOCK) { closesocket(s); diff --git a/inet_net_pton.c b/inet_net_pton.c index 49bac69a..af941bf6 100644 --- a/inet_net_pton.c +++ b/inet_net_pton.c @@ -66,6 +66,11 @@ * note: * network byte order assumed. this means 192.5.5.240/28 has * 0b11110000 in its fourth octet. + * note: + * On Windows we store the error in the thread errno, not + * in the winsock error code. This is to avoid loosing the + * actual last winsock error. So use macro ERRNO to fetch the + * errno this funtion sets when returning (-1), not SOCKERRNO. * author: * Paul Vixie (ISC), June 1996 */ @@ -186,11 +191,11 @@ inet_net_pton_ipv4(const char *src, unsigned char *dst, size_t size) return (bits); enoent: - errno = ENOENT; + SET_ERRNO(ENOENT); return (-1); emsgsize: - errno = EMSGSIZE; + SET_ERRNO(EMSGSIZE); return (-1); } @@ -381,11 +386,11 @@ inet_net_pton_ipv6(const char *src, unsigned char *dst, size_t size) return (bits); enoent: - errno = ENOENT; + SET_ERRNO(ENOENT); return (-1); emsgsize: - errno = EMSGSIZE; + SET_ERRNO(EMSGSIZE); return (-1); } @@ -399,6 +404,11 @@ inet_net_pton_ipv6(const char *src, unsigned char *dst, size_t size) * number of bits, either imputed classfully or specified with /CIDR, * or -1 if some failure occurred (check errno). ENOENT means it was * not a valid network specification. + * note: + * On Windows we store the error in the thread errno, not + * in the winsock error code. This is to avoid loosing the + * actual last winsock error. So use macro ERRNO to fetch the + * errno this funtion sets when returning (-1), not SOCKERRNO. * author: * Paul Vixie (ISC), June 1996 */ @@ -411,7 +421,7 @@ ares_inet_net_pton(int af, const char *src, void *dst, size_t size) case AF_INET6: return (inet_net_pton_ipv6(src, dst, size)); default: - errno = EAFNOSUPPORT; + SET_ERRNO(EAFNOSUPPORT); return (-1); } } @@ -429,11 +439,11 @@ int ares_inet_pton(int af, const char *src, void *dst) size = sizeof(struct in6_addr); else { - errno = EAFNOSUPPORT; + SET_ERRNO(EAFNOSUPPORT); return -1; } result = ares_inet_net_pton(af, src, dst, size); - if (result == -1 && errno == ENOENT) + if (result == -1 && ERRNO == ENOENT) return 0; return (result > -1 ? 1 : -1); } diff --git a/inet_ntop.c b/inet_ntop.c index 097e7764..f076e066 100644 --- a/inet_ntop.c +++ b/inet_ntop.c @@ -68,6 +68,11 @@ static const char *inet_ntop6(const unsigned char *src, char *dst, size_t size); * convert a network format address to presentation format. * return: * pointer to presentation format address (`dst'), or NULL (see errno). + * note: + * On Windows we store the error in the thread errno, not + * in the winsock error code. This is to avoid loosing the + * actual last winsock error. So use macro ERRNO to fetch the + * errno this funtion sets when returning NULL, not SOCKERRNO. * author: * Paul Vixie, 1996. */ @@ -81,7 +86,7 @@ ares_inet_ntop(int af, const void *src, char *dst, size_t size) case AF_INET6: return (inet_ntop6(src, dst, size)); default: - errno = EAFNOSUPPORT; + SET_ERRNO(EAFNOSUPPORT); return (NULL); } /* NOTREACHED */ @@ -106,7 +111,7 @@ inet_ntop4(const unsigned char *src, char *dst, size_t size) if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) > size) { - errno = ENOSPC; + SET_ERRNO(ENOSPC); return (NULL); } strcpy(dst, tmp); @@ -218,7 +223,7 @@ inet_ntop6(const unsigned char *src, char *dst, size_t size) */ if ((size_t)(tp - tmp) > size) { - errno = ENOSPC; + SET_ERRNO(ENOSPC); return (NULL); } strcpy(dst, tmp); diff --git a/windows_port.c b/windows_port.c index dabe0bcc..d9c358e2 100644 --- a/windows_port.c +++ b/windows_port.c @@ -105,7 +105,7 @@ ares_writev (ares_socket_t s, const struct iovec *vector, size_t count) buffer = bp = (char*) alloca (bytes); if (!buffer) { - errno = ENOMEM; + SET_ERRNO(ENOMEM); return (-1); }