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Merge branch 'Tieske-errormsg'

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This commit is contained in:
Diego Nehab 2015-03-03 19:20:44 -03:00
commit 321c0c9b1f
3 changed files with 107 additions and 80 deletions
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28
src/pierror.h Normal file
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@ -0,0 +1,28 @@
#ifndef PIERROR_H
#define PIERROR_H
/*=========================================================================*\
* Error messages
* Defines platform independent error messages
\*=========================================================================*/
#define PIE_HOST_NOT_FOUND "host not found"
#define PIE_ADDRINUSE "address already in use"
#define PIE_ISCONN "already connected"
#define PIE_ACCESS "permission denied"
#define PIE_CONNREFUSED "connection refused"
#define PIE_CONNABORTED "closed"
#define PIE_CONNRESET "closed"
#define PIE_TIMEDOUT "timeout"
#define PIE_AGAIN "temporary failure in name resolution"
#define PIE_BADFLAGS "invalid value for ai_flags"
#define PIE_BADHINTS "invalid value for hints"
#define PIE_FAIL "non-recoverable failure in name resolution"
#define PIE_FAMILY "ai_family not supported"
#define PIE_MEMORY "memory allocation failure"
#define PIE_NONAME "host or service not provided, or not known"
#define PIE_OVERFLOW "argument buffer overflow"
#define PIE_PROTOCOL "resolved protocol is unknown"
#define PIE_SERVICE "service not supported for socket type"
#define PIE_SOCKTYPE "ai_socktype not supported"
#endif

98
src/usocket.c
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@ -4,12 +4,13 @@
* *
* The code is now interrupt-safe. * The code is now interrupt-safe.
* The penalty of calling select to avoid busy-wait is only paid when * The penalty of calling select to avoid busy-wait is only paid when
* the I/O call fail in the first place. * the I/O call fail in the first place.
\*=========================================================================*/ \*=========================================================================*/
#include <string.h> #include <string.h>
#include <signal.h> #include <signal.h>
#include "socket.h" #include "socket.h"
#include "pierror.h"
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Wait for readable/writable/connected socket with timeout * Wait for readable/writable/connected socket with timeout
@ -72,7 +73,7 @@ int socket_waitfd(p_socket ps, int sw, p_timeout tm) {
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Initializes module * Initializes module
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_open(void) { int socket_open(void) {
/* instals a handler to ignore sigpipe or it will crash us */ /* instals a handler to ignore sigpipe or it will crash us */
@ -81,7 +82,7 @@ int socket_open(void) {
} }
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Close module * Close module
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_close(void) { int socket_close(void) {
return 1; return 1;
@ -100,7 +101,7 @@ void socket_destroy(p_socket ps) {
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Select with timeout control * Select with timeout control
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_select(t_socket n, fd_set *rfds, fd_set *wfds, fd_set *efds, int socket_select(t_socket n, fd_set *rfds, fd_set *wfds, fd_set *efds,
p_timeout tm) { p_timeout tm) {
int ret; int ret;
do { do {
@ -119,8 +120,8 @@ int socket_select(t_socket n, fd_set *rfds, fd_set *wfds, fd_set *efds,
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_create(p_socket ps, int domain, int type, int protocol) { int socket_create(p_socket ps, int domain, int type, int protocol) {
*ps = socket(domain, type, protocol); *ps = socket(domain, type, protocol);
if (*ps != SOCKET_INVALID) return IO_DONE; if (*ps != SOCKET_INVALID) return IO_DONE;
else return errno; else return errno;
} }
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
@ -129,22 +130,22 @@ int socket_create(p_socket ps, int domain, int type, int protocol) {
int socket_bind(p_socket ps, SA *addr, socklen_t len) { int socket_bind(p_socket ps, SA *addr, socklen_t len) {
int err = IO_DONE; int err = IO_DONE;
socket_setblocking(ps); socket_setblocking(ps);
if (bind(*ps, addr, len) < 0) err = errno; if (bind(*ps, addr, len) < 0) err = errno;
socket_setnonblocking(ps); socket_setnonblocking(ps);
return err; return err;
} }
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* *
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_listen(p_socket ps, int backlog) { int socket_listen(p_socket ps, int backlog) {
int err = IO_DONE; int err = IO_DONE;
if (listen(*ps, backlog)) err = errno; if (listen(*ps, backlog)) err = errno;
return err; return err;
} }
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* *
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
void socket_shutdown(p_socket ps, int how) { void socket_shutdown(p_socket ps, int how) {
shutdown(*ps, how); shutdown(*ps, how);
@ -161,7 +162,7 @@ int socket_connect(p_socket ps, SA *addr, socklen_t len, p_timeout tm) {
do if (connect(*ps, addr, len) == 0) return IO_DONE; do if (connect(*ps, addr, len) == 0) return IO_DONE;
while ((err = errno) == EINTR); while ((err = errno) == EINTR);
/* if connection failed immediately, return error code */ /* if connection failed immediately, return error code */
if (err != EINPROGRESS && err != EAGAIN) return err; if (err != EINPROGRESS && err != EAGAIN) return err;
/* zero timeout case optimization */ /* zero timeout case optimization */
if (timeout_iszero(tm)) return IO_TIMEOUT; if (timeout_iszero(tm)) return IO_TIMEOUT;
/* wait until we have the result of the connection attempt or timeout */ /* wait until we have the result of the connection attempt or timeout */
@ -176,7 +177,7 @@ int socket_connect(p_socket ps, SA *addr, socklen_t len, p_timeout tm) {
* Accept with timeout * Accept with timeout
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_accept(p_socket ps, p_socket pa, SA *addr, socklen_t *len, p_timeout tm) { int socket_accept(p_socket ps, p_socket pa, SA *addr, socklen_t *len, p_timeout tm) {
if (*ps == SOCKET_INVALID) return IO_CLOSED; if (*ps == SOCKET_INVALID) return IO_CLOSED;
for ( ;; ) { for ( ;; ) {
int err; int err;
if ((*pa = accept(*ps, addr, len)) != SOCKET_INVALID) return IO_DONE; if ((*pa = accept(*ps, addr, len)) != SOCKET_INVALID) return IO_DONE;
@ -192,7 +193,7 @@ int socket_accept(p_socket ps, p_socket pa, SA *addr, socklen_t *len, p_timeout
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Send with timeout * Send with timeout
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_send(p_socket ps, const char *data, size_t count, int socket_send(p_socket ps, const char *data, size_t count,
size_t *sent, p_timeout tm) size_t *sent, p_timeout tm)
{ {
int err; int err;
@ -224,14 +225,14 @@ int socket_send(p_socket ps, const char *data, size_t count,
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Sendto with timeout * Sendto with timeout
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_sendto(p_socket ps, const char *data, size_t count, size_t *sent, int socket_sendto(p_socket ps, const char *data, size_t count, size_t *sent,
SA *addr, socklen_t len, p_timeout tm) SA *addr, socklen_t len, p_timeout tm)
{ {
int err; int err;
*sent = 0; *sent = 0;
if (*ps == SOCKET_INVALID) return IO_CLOSED; if (*ps == SOCKET_INVALID) return IO_CLOSED;
for ( ;; ) { for ( ;; ) {
long put = (long) sendto(*ps, data, count, 0, addr, len); long put = (long) sendto(*ps, data, count, 0, addr, len);
if (put >= 0) { if (put >= 0) {
*sent = put; *sent = put;
return IO_DONE; return IO_DONE;
@ -261,8 +262,8 @@ int socket_recv(p_socket ps, char *data, size_t count, size_t *got, p_timeout tm
err = errno; err = errno;
if (taken == 0) return IO_CLOSED; if (taken == 0) return IO_CLOSED;
if (err == EINTR) continue; if (err == EINTR) continue;
if (err != EAGAIN) return err; if (err != EAGAIN) return err;
if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err; if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
} }
return IO_UNKNOWN; return IO_UNKNOWN;
} }
@ -270,7 +271,7 @@ int socket_recv(p_socket ps, char *data, size_t count, size_t *got, p_timeout tm
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* Recvfrom with timeout * Recvfrom with timeout
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_recvfrom(p_socket ps, char *data, size_t count, size_t *got, int socket_recvfrom(p_socket ps, char *data, size_t count, size_t *got,
SA *addr, socklen_t *len, p_timeout tm) { SA *addr, socklen_t *len, p_timeout tm) {
int err; int err;
*got = 0; *got = 0;
@ -284,8 +285,8 @@ int socket_recvfrom(p_socket ps, char *data, size_t count, size_t *got,
err = errno; err = errno;
if (taken == 0) return IO_CLOSED; if (taken == 0) return IO_CLOSED;
if (err == EINTR) continue; if (err == EINTR) continue;
if (err != EAGAIN) return err; if (err != EAGAIN) return err;
if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err; if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
} }
return IO_UNKNOWN; return IO_UNKNOWN;
} }
@ -298,7 +299,7 @@ int socket_recvfrom(p_socket ps, char *data, size_t count, size_t *got,
* with send/recv replaced with write/read. We can't just use write/read * with send/recv replaced with write/read. We can't just use write/read
* in the socket version, because behaviour when size is zero is different. * in the socket version, because behaviour when size is zero is different.
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_write(p_socket ps, const char *data, size_t count, int socket_write(p_socket ps, const char *data, size_t count,
size_t *sent, p_timeout tm) size_t *sent, p_timeout tm)
{ {
int err; int err;
@ -344,8 +345,8 @@ int socket_read(p_socket ps, char *data, size_t count, size_t *got, p_timeout tm
err = errno; err = errno;
if (taken == 0) return IO_CLOSED; if (taken == 0) return IO_CLOSED;
if (err == EINTR) continue; if (err == EINTR) continue;
if (err != EAGAIN) return err; if (err != EAGAIN) return err;
if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err; if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
} }
return IO_UNKNOWN; return IO_UNKNOWN;
} }
@ -369,7 +370,7 @@ void socket_setnonblocking(p_socket ps) {
} }
/*-------------------------------------------------------------------------*\ /*-------------------------------------------------------------------------*\
* DNS helpers * DNS helpers
\*-------------------------------------------------------------------------*/ \*-------------------------------------------------------------------------*/
int socket_gethostbyaddr(const char *addr, socklen_t len, struct hostent **hp) { int socket_gethostbyaddr(const char *addr, socklen_t len, struct hostent **hp) {
*hp = gethostbyaddr(addr, len, AF_INET); *hp = gethostbyaddr(addr, len, AF_INET);
@ -394,7 +395,7 @@ int socket_gethostbyname(const char *addr, struct hostent **hp) {
const char *socket_hoststrerror(int err) { const char *socket_hoststrerror(int err) {
if (err <= 0) return io_strerror(err); if (err <= 0) return io_strerror(err);
switch (err) { switch (err) {
case HOST_NOT_FOUND: return "host not found"; case HOST_NOT_FOUND: return PIE_HOST_NOT_FOUND;
default: return hstrerror(err); default: return hstrerror(err);
} }
} }
@ -402,13 +403,13 @@ const char *socket_hoststrerror(int err) {
const char *socket_strerror(int err) { const char *socket_strerror(int err) {
if (err <= 0) return io_strerror(err); if (err <= 0) return io_strerror(err);
switch (err) { switch (err) {
case EADDRINUSE: return "address already in use"; case EADDRINUSE: return PIE_ADDRINUSE;
case EISCONN: return "already connected"; case EISCONN: return PIE_ISCONN;
case EACCES: return "permission denied"; case EACCES: return PIE_ACCESS;
case ECONNREFUSED: return "connection refused"; case ECONNREFUSED: return PIE_CONNREFUSED;
case ECONNABORTED: return "closed"; case ECONNABORTED: return PIE_CONNABORTED;
case ECONNRESET: return "closed"; case ECONNRESET: return PIE_CONNRESET;
case ETIMEDOUT: return "timeout"; case ETIMEDOUT: return PIE_TIMEDOUT;
default: return strerror(err); default: return strerror(err);
} }
} }
@ -416,28 +417,27 @@ const char *socket_strerror(int err) {
const char *socket_ioerror(p_socket ps, int err) { const char *socket_ioerror(p_socket ps, int err) {
(void) ps; (void) ps;
return socket_strerror(err); return socket_strerror(err);
} }
const char *socket_gaistrerror(int err) { const char *socket_gaistrerror(int err) {
if (err == 0) return NULL; if (err == 0) return NULL;
switch (err) { switch (err) {
case EAI_AGAIN: return "temporary failure in name resolution"; case EAI_AGAIN: return PIE_AGAIN;
case EAI_BADFLAGS: return "invalid value for ai_flags"; case EAI_BADFLAGS: return PIE_BADFLAGS;
#ifdef EAI_BADHINTS #ifdef EAI_BADHINTS
case EAI_BADHINTS: return "invalid value for hints"; case EAI_BADHINTS: return PIE_BADHINTS;
#endif #endif
case EAI_FAIL: return "non-recoverable failure in name resolution"; case EAI_FAIL: return PIE_FAIL;
case EAI_FAMILY: return "ai_family not supported"; case EAI_FAMILY: return PIE_FAMILY;
case EAI_MEMORY: return "memory allocation failure"; case EAI_MEMORY: return PIE_MEMORY;
case EAI_NONAME: case EAI_NONAME: return PIE_NONAME;
return "host or service not provided, or not known"; case EAI_OVERFLOW: return PIE_OVERFLOW;
case EAI_OVERFLOW: return "argument buffer overflow";
#ifdef EAI_PROTOCOL #ifdef EAI_PROTOCOL
case EAI_PROTOCOL: return "resolved protocol is unknown"; case EAI_PROTOCOL: return PIE_PROTOCOL;
#endif #endif
case EAI_SERVICE: return "service not supported for socket type"; case EAI_SERVICE: return PIE_SERVICE;
case EAI_SOCKTYPE: return "ai_socktype not supported"; case EAI_SOCKTYPE: return PIE_SOCKTYPE;
case EAI_SYSTEM: return strerror(errno); case EAI_SYSTEM: return strerror(errno);
default: return gai_strerror(err); default: return gai_strerror(err);
} }
} }

61
src/wsocket.c
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@ -8,6 +8,7 @@
#include <string.h> #include <string.h>
#include "socket.h" #include "socket.h"
#include "pierror.h"
/* WinSock doesn't have a strerror... */ /* WinSock doesn't have a strerror... */
static const char *wstrerror(int err); static const char *wstrerror(int err);
@ -330,7 +331,7 @@ int socket_gethostbyname(const char *addr, struct hostent **hp) {
const char *socket_hoststrerror(int err) { const char *socket_hoststrerror(int err) {
if (err <= 0) return io_strerror(err); if (err <= 0) return io_strerror(err);
switch (err) { switch (err) {
case WSAHOST_NOT_FOUND: return "host not found"; case WSAHOST_NOT_FOUND: return PIE_HOST_NOT_FOUND;
default: return wstrerror(err); default: return wstrerror(err);
} }
} }
@ -338,13 +339,13 @@ const char *socket_hoststrerror(int err) {
const char *socket_strerror(int err) { const char *socket_strerror(int err) {
if (err <= 0) return io_strerror(err); if (err <= 0) return io_strerror(err);
switch (err) { switch (err) {
case WSAEADDRINUSE: return "address already in use"; case WSAEADDRINUSE: return PIE_ADDRINUSE;
case WSAECONNREFUSED: return "connection refused"; case WSAECONNREFUSED : return PIE_CONNREFUSED;
case WSAEISCONN: return "already connected"; case WSAEISCONN: return PIE_ISCONN;
case WSAEACCES: return "permission denied"; case WSAEACCES: return PIE_ACCESS;
case WSAECONNABORTED: return "closed"; case WSAECONNABORTED: return PIE_CONNABORTED;
case WSAECONNRESET: return "closed"; case WSAECONNRESET: return PIE_CONNRESET;
case WSAETIMEDOUT: return "timeout"; case WSAETIMEDOUT: return PIE_TIMEDOUT;
default: return wstrerror(err); default: return wstrerror(err);
} }
} }
@ -357,7 +358,7 @@ const char *socket_ioerror(p_socket ps, int err) {
static const char *wstrerror(int err) { static const char *wstrerror(int err) {
switch (err) { switch (err) {
case WSAEINTR: return "Interrupted function call"; case WSAEINTR: return "Interrupted function call";
case WSAEACCES: return "Permission denied"; case WSAEACCES: return PIE_ACCESS; // "Permission denied";
case WSAEFAULT: return "Bad address"; case WSAEFAULT: return "Bad address";
case WSAEINVAL: return "Invalid argument"; case WSAEINVAL: return "Invalid argument";
case WSAEMFILE: return "Too many open files"; case WSAEMFILE: return "Too many open files";
@ -370,24 +371,23 @@ static const char *wstrerror(int err) {
case WSAEPROTOTYPE: return "Protocol wrong type for socket"; case WSAEPROTOTYPE: return "Protocol wrong type for socket";
case WSAENOPROTOOPT: return "Bad protocol option"; case WSAENOPROTOOPT: return "Bad protocol option";
case WSAEPROTONOSUPPORT: return "Protocol not supported"; case WSAEPROTONOSUPPORT: return "Protocol not supported";
case WSAESOCKTNOSUPPORT: return "Socket type not supported"; case WSAESOCKTNOSUPPORT: return PIE_SOCKTYPE; // "Socket type not supported";
case WSAEOPNOTSUPP: return "Operation not supported"; case WSAEOPNOTSUPP: return "Operation not supported";
case WSAEPFNOSUPPORT: return "Protocol family not supported"; case WSAEPFNOSUPPORT: return "Protocol family not supported";
case WSAEAFNOSUPPORT: case WSAEAFNOSUPPORT: return PIE_FAMILY; // "Address family not supported by protocol family";
return "Address family not supported by protocol family"; case WSAEADDRINUSE: return PIE_ADDRINUSE; // "Address already in use";
case WSAEADDRINUSE: return "Address already in use";
case WSAEADDRNOTAVAIL: return "Cannot assign requested address"; case WSAEADDRNOTAVAIL: return "Cannot assign requested address";
case WSAENETDOWN: return "Network is down"; case WSAENETDOWN: return "Network is down";
case WSAENETUNREACH: return "Network is unreachable"; case WSAENETUNREACH: return "Network is unreachable";
case WSAENETRESET: return "Network dropped connection on reset"; case WSAENETRESET: return "Network dropped connection on reset";
case WSAECONNABORTED: return "Software caused connection abort"; case WSAECONNABORTED: return "Software caused connection abort";
case WSAECONNRESET: return "Connection reset by peer"; case WSAECONNRESET: return PIE_CONNRESET; // "Connection reset by peer";
case WSAENOBUFS: return "No buffer space available"; case WSAENOBUFS: return "No buffer space available";
case WSAEISCONN: return "Socket is already connected"; case WSAEISCONN: return PIE_ISCONN; // "Socket is already connected";
case WSAENOTCONN: return "Socket is not connected"; case WSAENOTCONN: return "Socket is not connected";
case WSAESHUTDOWN: return "Cannot send after socket shutdown"; case WSAESHUTDOWN: return "Cannot send after socket shutdown";
case WSAETIMEDOUT: return "Connection timed out"; case WSAETIMEDOUT: return PIE_TIMEDOUT; // "Connection timed out";
case WSAECONNREFUSED: return "Connection refused"; case WSAECONNREFUSED: return PIE_CONNREFUSED; // "Connection refused";
case WSAEHOSTDOWN: return "Host is down"; case WSAEHOSTDOWN: return "Host is down";
case WSAEHOSTUNREACH: return "No route to host"; case WSAEHOSTUNREACH: return "No route to host";
case WSAEPROCLIM: return "Too many processes"; case WSAEPROCLIM: return "Too many processes";
@ -396,9 +396,9 @@ static const char *wstrerror(int err) {
case WSANOTINITIALISED: case WSANOTINITIALISED:
return "Successful WSAStartup not yet performed"; return "Successful WSAStartup not yet performed";
case WSAEDISCON: return "Graceful shutdown in progress"; case WSAEDISCON: return "Graceful shutdown in progress";
case WSAHOST_NOT_FOUND: return "Host not found"; case WSAHOST_NOT_FOUND: return PIE_HOST_NOT_FOUND; // "Host not found";
case WSATRY_AGAIN: return "Nonauthoritative host not found"; case WSATRY_AGAIN: return "Nonauthoritative host not found";
case WSANO_RECOVERY: return "Nonrecoverable name lookup error"; case WSANO_RECOVERY: return PIE_FAIL; // "Nonrecoverable name lookup error";
case WSANO_DATA: return "Valid name, no data record of requested type"; case WSANO_DATA: return "Valid name, no data record of requested type";
default: return "Unknown error"; default: return "Unknown error";
} }
@ -407,24 +407,23 @@ static const char *wstrerror(int err) {
const char *socket_gaistrerror(int err) { const char *socket_gaistrerror(int err) {
if (err == 0) return NULL; if (err == 0) return NULL;
switch (err) { switch (err) {
case EAI_AGAIN: return "temporary failure in name resolution"; case EAI_AGAIN: return PIE_AGAIN;
case EAI_BADFLAGS: return "invalid value for ai_flags"; case EAI_BADFLAGS: return PIE_BADFLAGS;
#ifdef EAI_BADHINTS #ifdef EAI_BADHINTS
case EAI_BADHINTS: return "invalid value for hints"; case EAI_BADHINTS: return PIE_BADHINTS;
#endif #endif
case EAI_FAIL: return "non-recoverable failure in name resolution"; case EAI_FAIL: return PIE_FAIL;
case EAI_FAMILY: return "ai_family not supported"; case EAI_FAMILY: return PIE_FAMILY;
case EAI_MEMORY: return "memory allocation failure"; case EAI_MEMORY: return PIE_MEMORY;
case EAI_NONAME: case EAI_NONAME: return PIE_NONAME;
return "host or service not provided, or not known";
#ifdef EAI_OVERFLOW #ifdef EAI_OVERFLOW
case EAI_OVERFLOW: return "argument buffer overflow"; case EAI_OVERFLOW: return PIE_OVERFLOW;
#endif #endif
#ifdef EAI_PROTOCOL #ifdef EAI_PROTOCOL
case EAI_PROTOCOL: return "resolved protocol is unknown"; case EAI_PROTOCOL: return PIE_PROTOCOL;
#endif #endif
case EAI_SERVICE: return "service not supported for socket type"; case EAI_SERVICE: return PIE_SERVICE;
case EAI_SOCKTYPE: return "ai_socktype not supported"; case EAI_SOCKTYPE: return PIE_SOCKTYPE;
#ifdef EAI_SYSTEM #ifdef EAI_SYSTEM
case EAI_SYSTEM: return strerror(errno); case EAI_SYSTEM: return strerror(errno);
#endif #endif