diff --git a/lib/download.c b/lib/download.c
index fb0cb60ea0afc950f2e9f4e95fbd941d71d28a1c..f2fd4448b3c528982429bb5daade4d42093fab28 100644
--- a/lib/download.c
+++ b/lib/download.c
@@ -80,27 +80,37 @@
#define MAX(x,y) ((x)>(y)?(x):(y))
-/* --- download a stream from a socket --- */
+/* --- download and upload a stream from/to a socket --- */
-/* This newly edited version of Download() was brought to us by the friendly
- Mark Butler <butlerm@xmission.com>. Re-indented with the indent command. */
+/* Parts of this function was brought to us by the friendly Mark Butler
+ <butlerm@xmission.com>. */
UrgError
-Download (struct UrlData *data,
- int sockfd, /* socket to read from */
+Transfer (struct UrlData *data,
+ /* READ stuff */
+ int sockfd, /* socket to read from or -1 */
int size, /* -1 if unknown at this point */
bool getheader, /* TRUE if header parsing is wanted */
- long *bytecountp /* return number of bytes read */
+ long *bytecountp, /* return number of bytes read or NULL */
+
+ /* WRITE stuff */
+ int writesockfd, /* socket to write to, it may very well be
+ the same we read from. -1 disables */
+ long *writebytecountp /* return number of bytes written or NULL */
+
+
)
{
char *buf = data->buffer;
size_t nread;
- int bytecount = 0;
- long contentlength=0;
+ int bytecount = 0; /* number of bytes read */
+ int writebytecount = 0; /* number of bytes written */
+ long contentlength=0; /* size of incoming data */
struct timeval start = tvnow();
struct timeval now = start;
- bool header = TRUE;
- int headerline = 0; /* counts header lines to better track the first one */
+ bool header = TRUE; /* incoming data has HTTP header */
+ int headerline = 0; /* counts header lines to better track the
+ first one */
char *hbufp; /* points at *end* of header line */
int hbuflen = 0;
@@ -112,9 +122,6 @@ Download (struct UrlData *data,
int offset = 0; /* possible resume offset read from the
Content-Range: header */
int code = 0; /* error code from the 'HTTP/1.? XXX' line */
-#ifdef USE_ZLIB
- gzFile gzfile=NULL;
-#endif
/* for the low speed checks: */
UrgError urg;
@@ -123,6 +130,9 @@ Download (struct UrlData *data,
char newurl[URL_MAX_LENGTH]; /* buffer for Location: URL */
+ /* the highest fd we use + 1 */
+ int maxfd = (sockfd>writesockfd?sockfd:writesockfd)+1;
+
hbufp = data->headerbuff;
myalarm (0); /* switch off the alarm-style timeout */
@@ -136,7 +146,9 @@ Download (struct UrlData *data,
}
{
fd_set readfd;
- fd_set keepfd;
+ fd_set writefd;
+ fd_set rkeepfd;
+ fd_set wkeepfd;
struct timeval interval;
bool keepon = TRUE;
@@ -148,76 +160,105 @@ Download (struct UrlData *data,
*/
FD_ZERO (&readfd); /* clear it */
- FD_SET (sockfd, &readfd);
+ if(sockfd != -1) {
+ FD_SET (sockfd, &readfd); /* read socket */
+ }
+
+ FD_ZERO (&writefd); /* clear it */
+ if(writesockfd != -1) {
+ FD_SET (writesockfd, &writefd); /* write socket */
+ }
+
+ /* get these in backup variables to be able to restore them on each lap in
+ the select() loop */
+ rkeepfd = readfd;
+ wkeepfd = writefd;
- keepfd = readfd;
-#ifdef USE_ZLIB
- gzfile = gzdopen(sockfd, "rb");
-#endif
while (keepon) {
- readfd = keepfd; /* set this every lap in the loop */
- interval.tv_sec = 2;
+ readfd = rkeepfd; /* set those every lap in the loop */
+ writefd = wkeepfd;
+ interval.tv_sec = 1;
interval.tv_usec = 0;
- switch (select (sockfd + 1, &readfd, NULL, NULL, &interval)) {
- case -1: /* error, stop reading */
+ switch (select (maxfd, &readfd, &writefd, NULL, &interval)) {
+ case -1: /* select() error, stop reading */
keepon = FALSE;
continue;
case 0: /* timeout */
break;
- default: /* read! */
+ default:
+ if((sockfd>-1) && FD_ISSET(sockfd, &readfd)) {
+ /* read! */
#ifdef USE_SSLEAY
- if (data->use_ssl) {
- nread = SSL_read (data->ssl, buf, BUFSIZE - 1);
- }
- else {
-#endif
-#ifdef USE_ZLIB
- nread = gzread(gzfile, buf, BUFSIZE -1 );
-#else
- nread = sread (sockfd, buf, BUFSIZE - 1);
+ if (data->use_ssl) {
+ nread = SSL_read (data->ssl, buf, BUFSIZE - 1);
+ }
+ else {
#endif
+ nread = sread (sockfd, buf, BUFSIZE - 1);
#ifdef USE_SSLEAY
- }
+ }
#endif /* USE_SSLEAY */
- /* NULL terminate, allowing string ops to be used */
- if (0 < (signed int) nread)
- buf[nread] = 0;
+ /* NULL terminate, allowing string ops to be used */
+ if (0 < (signed int) nread)
+ buf[nread] = 0;
- /* if we receive 0 or less here, the server closed the connection and
- we bail out from this! */
- else if (0 >= (signed int) nread) {
- keepon = FALSE;
- break;
- }
+ /* if we receive 0 or less here, the server closed the connection and
+ we bail out from this! */
+ else if (0 >= (signed int) nread) {
+ keepon = FALSE;
+ break;
+ }
- str = buf; /* Default buffer to use when we write the
+ str = buf; /* Default buffer to use when we write the
buffer, it may be changed in the flow below
before the actual storing is done. */
- /* Since this is a two-state thing, we check if we are parsing
- headers at the moment or not. */
-
- if (header) {
- /* we are in parse-the-header-mode */
-
- /* header line within buffer loop */
- do {
- int hbufp_index;
-
- str_start = str; /* str_start is start of line within buf */
-
- end_ptr = strchr (str_start, '\n');
+ /* Since this is a two-state thing, we check if we are parsing
+ headers at the moment or not. */
+
+ if (header) {
+ /* we are in parse-the-header-mode */
+
+ /* header line within buffer loop */
+ do {
+ int hbufp_index;
+
+ str_start = str; /* str_start is start of line within buf */
+
+ end_ptr = strchr (str_start, '\n');
+
+ if (!end_ptr) {
+ /* no more complete header lines within buffer */
+ /* copy what is remaining into headerbuff */
+ int str_length = (int)strlen(str);
+
+ if (hbuflen + (int)str_length >= data->headersize) {
+ char *newbuff;
+ long newsize=MAX((hbuflen+str_length)*3/2,
+ data->headersize*2);
+ hbufp_index = hbufp - data->headerbuff;
+ newbuff = (char *)realloc(data->headerbuff, newsize);
+ if(!newbuff) {
+ failf (data, "Failed to alloc memory for big header!");
+ return URG_READ_ERROR;
+ }
+ data->headersize=newsize;
+ data->headerbuff = newbuff;
+ hbufp = data->headerbuff + hbufp_index;
+ }
+ strcpy (hbufp, str);
+ hbufp += strlen (str);
+ hbuflen += strlen (str);
+ break; /* read more and try again */
+ }
- if (!end_ptr) {
- /* no more complete header lines within buffer */
- /* copy what is remaining into headerbuff */
- int str_length = (int)strlen(str);
+ str = end_ptr + 1; /* move just past new line */
- if (hbuflen + (int)str_length >= data->headersize) {
+ if (hbuflen + (str - str_start) >= data->headersize) {
char *newbuff;
- long newsize=MAX((hbuflen+str_length)*3/2,
+ long newsize=MAX((hbuflen+(str-str_start))*3/2,
data->headersize*2);
hbufp_index = hbufp - data->headerbuff;
newbuff = (char *)realloc(data->headerbuff, newsize);
@@ -225,227 +266,267 @@ Download (struct UrlData *data,
failf (data, "Failed to alloc memory for big header!");
return URG_READ_ERROR;
}
- data->headersize=newsize;
+ data->headersize= newsize;
data->headerbuff = newbuff;
hbufp = data->headerbuff + hbufp_index;
- }
- strcpy (hbufp, str);
- hbufp += strlen (str);
- hbuflen += strlen (str);
- break; /* read more and try again */
- }
-
- str = end_ptr + 1; /* move just past new line */
-
- if (hbuflen + (str - str_start) >= data->headersize) {
- char *newbuff;
- long newsize=MAX((hbuflen+(str-str_start))*3/2,
- data->headersize*2);
- hbufp_index = hbufp - data->headerbuff;
- newbuff = (char *)realloc(data->headerbuff, newsize);
- if(!newbuff) {
- failf (data, "Failed to alloc memory for big header!");
- return URG_READ_ERROR;
}
- data->headersize= newsize;
- data->headerbuff = newbuff;
- hbufp = data->headerbuff + hbufp_index;
- }
-
- /* copy to end of line */
- strncpy (hbufp, str_start, str - str_start);
- hbufp += str - str_start;
- hbuflen += str - str_start;
- *hbufp = 0;
-
- p = data->headerbuff;
-
- /* we now have a full line that p points to */
- if (('\n' == *p) || ('\r' == *p)) {
- /* Zero-length line means end of header! */
- if (-1 != size) /* if known */
- size += bytecount; /* we append the already read size */
-
-
- if ('\r' == *p)
- p++; /* pass the \r byte */
- if ('\n' == *p)
- p++; /* pass the \n byte */
-
- ProgressInit (data, size); /* init progress meter */
- header = FALSE; /* no more header to parse! */
-
- /* now, only output this if the header AND body are requested: */
- if ((data->conf & (CONF_HEADER | CONF_NOBODY)) == CONF_HEADER) {
- if((p - data->headerbuff) !=
- data->fwrite (data->headerbuff, 1,
- p - data->headerbuff, data->out)) {
+
+ /* copy to end of line */
+ strncpy (hbufp, str_start, str - str_start);
+ hbufp += str - str_start;
+ hbuflen += str - str_start;
+ *hbufp = 0;
+
+ p = data->headerbuff;
+
+ /* we now have a full line that p points to */
+ if (('\n' == *p) || ('\r' == *p)) {
+ /* Zero-length line means end of header! */
+ if (-1 != size) /* if known */
+ size += bytecount; /* we append the already read size */
+
+
+ if ('\r' == *p)
+ p++; /* pass the \r byte */
+ if ('\n' == *p)
+ p++; /* pass the \n byte */
+
+ ProgressInit (data, size); /* init progress meter */
+ header = FALSE; /* no more header to parse! */
+
+ /* now, only output this if the header AND body are requested:
+ */
+ if ((data->conf & (CONF_HEADER | CONF_NOBODY)) ==
+ CONF_HEADER) {
+ if((p - data->headerbuff) !=
+ data->fwrite (data->headerbuff, 1,
+ p - data->headerbuff, data->out)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+ }
+ if(data->writeheader) {
+ /* obviously, the header is requested to be written to
+ this file: */
+ if((p - data->headerbuff) !=
+ fwrite (data->headerbuff, 1, p - data->headerbuff,
+ data->writeheader)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+ }
+ break; /* exit header line loop */
+ }
+
+ if (!headerline++) {
+ /* This is the first header, it MUST be the error code line
+ or else we consiser this to be the body right away! */
+ if (sscanf (p, " HTTP/1.%*c %3d", &code)) {
+ /* 404 -> URL not found! */
+ if (
+ ( ((data->conf & CONF_FOLLOWLOCATION) && (code >= 400))
+ ||
+ !(data->conf & CONF_FOLLOWLOCATION) && (code >= 300))
+ && (data->conf & CONF_FAILONERROR)) {
+ /* If we have been told to fail hard on HTTP-errors,
+ here is the check for that: */
+ /* serious error, go home! */
+ failf (data, "The requested file was not found");
+ return URG_HTTP_NOT_FOUND;
+ }
+ }
+ else {
+ header = FALSE; /* this is not a header line */
+ break;
+ }
+ }
+ /* check for Content-Length: header lines to get size */
+ if (strnequal("Content-Length", p, 14) &&
+ sscanf (p+14, ": %ld", &contentlength))
+ size = contentlength;
+ else if (strnequal("Content-Range", p, 13) &&
+ sscanf (p+13, ": bytes %d-", &offset)) {
+ if (data->resume_from == offset) {
+ /* we asked for a resume and we got it */
+ content_range = TRUE;
+ }
+ }
+ else if(data->cookies &&
+ strnequal("Set-Cookie: ", p, 11)) {
+ cookie_add(data->cookies, TRUE, &p[12]);
+ }
+ else if(strnequal("Last-Modified:", p,
+ strlen("Last-Modified:")) &&
+ data->timecondition) {
+ time_t secs=time(NULL);
+ timeofdoc = get_date(p+strlen("Last-Modified:"), &secs);
+ }
+ else if ((code >= 300 && code < 400) &&
+ (data->conf & CONF_FOLLOWLOCATION) &&
+ strnequal("Location", p, 8) &&
+ sscanf (p+8, ": %" URL_MAX_LENGTH_TXT "s", newurl)) {
+ /* this is the URL that the server advices us to get
+ instead */
+ data->newurl = strdup (newurl);
+ }
+
+ if (data->conf & CONF_HEADER) {
+ if(hbuflen != data->fwrite (p, 1, hbuflen, data->out)) {
failf (data, "Failed writing output");
return URG_WRITE_ERROR;
}
- }
+ }
if(data->writeheader) {
- /* obviously, the header is requested to be written to
- this file: */
- if((p - data->headerbuff) !=
- fwrite (data->headerbuff, 1, p - data->headerbuff,
- data->writeheader)) {
+ /* the header is requested to be written to this file */
+ if(hbuflen != fwrite (p, 1, hbuflen, data->writeheader)) {
failf (data, "Failed writing output");
return URG_WRITE_ERROR;
}
}
- break; /* exit header line loop */
- }
-
- if (!headerline++) {
- /* This is the first header, it MUST be the error code line
- or else we consiser this to be the body right away! */
- if (sscanf (p, " HTTP/1.%*c %3d", &code)) {
- /* 404 -> URL not found! */
- if (
- ( ((data->conf & CONF_FOLLOWLOCATION) && (code >= 400)) ||
- !(data->conf & CONF_FOLLOWLOCATION) && (code >= 300))
- && (data->conf & CONF_FAILONERROR)) {
- /* If we have been told to fail hard on HTTP-errors,
- here is the check for that: */
- /* serious error, go home! */
- failf (data, "The requested file was not found");
- return URG_HTTP_NOT_FOUND;
- }
- }
- else {
- header = FALSE; /* this is not a header line */
- break;
- }
- }
- /* check for Content-Length: header lines to get size */
- if (strnequal("Content-Length", p, 14) &&
- sscanf (p+14, ": %ld", &contentlength))
- size = contentlength;
- else if (strnequal("Content-Range", p, 13) &&
- sscanf (p+13, ": bytes %d-", &offset)) {
- if (data->resume_from == offset) {
- /* we asked for a resume and we got it */
- content_range = TRUE;
- }
- }
- else if(data->cookies &&
- strnequal("Set-Cookie: ", p, 11)) {
- cookie_add(data->cookies, TRUE, &p[12]);
+
+ /* reset hbufp pointer && hbuflen */
+ hbufp = data->headerbuff;
+ hbuflen = 0;
}
- else if(strnequal("Last-Modified:", p, strlen("Last-Modified:")) &&
- data->timecondition) {
- time_t secs=time(NULL);
- timeofdoc = get_date(p+strlen("Last-Modified:"), &secs);
+ while (*str); /* header line within buffer */
+
+ /* We might have reached the end of the header part here, but
+ there might be a non-header part left in the end of the read
+ buffer. */
+
+ if (!header) {
+ /* the next token and forward is not part of
+ the header! */
+
+ /* we subtract the remaining header size from the buffer */
+ nread -= (str - buf);
}
- else if ((code >= 300 && code < 400) &&
- (data->conf & CONF_FOLLOWLOCATION) &&
- strnequal("Location", p, 8) &&
- sscanf (p+8, ": %" URL_MAX_LENGTH_TXT "s", newurl)) {
- /* this is the URL that the server advices us to get
- instead */
- data->newurl = strdup (newurl);
- }
-
- if (data->conf & CONF_HEADER) {
- if(hbuflen != data->fwrite (p, 1, hbuflen, data->out)) {
- failf (data, "Failed writing output");
- return URG_WRITE_ERROR;
- }
- }
- if(data->writeheader) {
- /* the header is requested to be written to this file */
- if(hbuflen != fwrite (p, 1, hbuflen, data->writeheader)) {
- failf (data, "Failed writing output");
- return URG_WRITE_ERROR;
- }
+
+ } /* end if header mode */
+
+ /* This is not an 'else if' since it may be a rest from the header
+ parsing, where the beginning of the buffer is headers and the end
+ is non-headers. */
+ if (str && !header && (nread > 0)) {
+
+ if(0 == bodywrites) {
+ /* These checks are only made the first time we are about to
+ write a chunk of the body */
+ if(data->conf&CONF_HTTP) {
+ /* HTTP-only checks */
+ if (data->resume_from && !content_range ) {
+ /* we wanted to resume a download, although the server
+ doesn't seem to support this */
+ failf (data, "HTTP server doesn't seem to support byte ranges. Cannot resume.");
+ return URG_HTTP_RANGE_ERROR;
+ }
+ else if (data->newurl) {
+ /* abort after the headers if "follow Location" is set */
+ infof (data, "Follow to new URL: %s\n", data->newurl);
+ return URG_OK;
+ }
+ else if(data->timecondition && !data->range) {
+ /* A time condition has been set AND no ranges have been
+ requested. This seems to be what chapter 13.3.4 of
+ RFC 2616 defines to be the correct action for a
+ HTTP/1.1 client */
+ if((timeofdoc > 0) && (data->timevalue > 0)) {
+ switch(data->timecondition) {
+ case TIMECOND_IFMODSINCE:
+ default:
+ if(timeofdoc < data->timevalue) {
+ infof(data,
+ "The requested document is not new enough");
+ return URG_OK;
+ }
+ break;
+ case TIMECOND_IFUNMODSINCE:
+ if(timeofdoc > data->timevalue) {
+ infof(data,
+ "The requested document is not old enough");
+ return URG_OK;
+ }
+ break;
+ } /* switch */
+ } /* two valid time strings */
+ } /* we have a time condition */
+ } /* this is HTTP */
+ } /* this is the first time we write a body part */
+ bodywrites++;
+
+ if(data->maxdownload &&
+ (bytecount + nread > data->maxdownload)) {
+ nread = data->maxdownload - bytecount;
+ if(nread < 0 ) /* this should be unusual */
+ nread = 0;
+ keepon = FALSE; /* we're done now! */
+ }
+
+ bytecount += nread;
+
+ if (nread != data->fwrite (str, 1, nread, data->out)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
}
- /* reset hbufp pointer && hbuflen */
- hbufp = data->headerbuff;
- hbuflen = 0;
- }
- while (*str); /* header line within buffer */
-
- /* We might have reached the end of the header part here, but
- there might be a non-header part left in the end of the read
- buffer. */
-
- if (!header) {
- /* the next token and forward is not part of
- the header! */
-
- /* we subtract the remaining header size from the buffer */
- nread -= (str - buf);
- }
-
- } /* end if header mode */
-
- /* This is not an 'else if' since it may be a rest from the header
- parsing, where the beginning of the buffer is headers and the end
- is non-headers. */
- if (str && !header && (nread > 0)) {
-
- if(0 == bodywrites) {
- /* These checks are only made the first time we are about to
- write a chunk of the body */
- if(data->conf&CONF_HTTP) {
- /* HTTP-only checks */
- if (data->resume_from && !content_range ) {
- /* we wanted to resume a download, although the server doesn't
- seem to support this */
- failf (data, "HTTP server doesn't seem to support byte ranges. Cannot resume.");
- return URG_HTTP_RANGE_ERROR;
+ } /* if (! header and data to read ) */
+ } /* if( read from socket ) */
+
+ if((writesockfd>-1) && FD_ISSET(writesockfd, &writefd)) {
+ /* write */
+
+ char scratch[BUFSIZE * 2];
+ int i, si;
+ int bytes_written;
+
+ if(data->crlf)
+ buf = data->buffer; /* put it back on the buffer */
+
+ nread = data->fread(buf, 1, BUFSIZE, data->in);
+ writebytecount += nread;
+
+ if (nread<=0) {
+ /* done */
+ keepon = FALSE;
+ break;
+ }
+
+ /* convert LF to CRLF if so asked */
+ if (data->crlf) {
+ for(i = 0, si = 0; i < (int)nread; i++, si++) {
+ if (buf[i] == 0x0a) {
+ scratch[si++] = 0x0d;
+ scratch[si] = 0x0a;
}
- else if (data->newurl) {
- /* abort after the headers if "follow Location" is set */
- infof (data, "Follow to new URL: %s\n", data->newurl);
- return URG_OK;
+ else {
+ scratch[si] = buf[i];
}
- else if(data->timecondition && !data->range) {
- /* A time condition has been set AND no ranges have been
- requested. This seems to be what chapter 13.3.4 of RFC 2616
- defines to be the correct action for a HTTP/1.1 client */
- if((timeofdoc > 0) && (data->timevalue > 0)) {
- switch(data->timecondition) {
- case TIMECOND_IFMODSINCE:
- default:
- if(timeofdoc < data->timevalue) {
- infof(data, "The requested document is not new enough");
- return URG_OK;
- }
- break;
- case TIMECOND_IFUNMODSINCE:
- if(timeofdoc > data->timevalue) {
- infof(data, "The requested document is not old enough");
- return URG_OK;
- }
- break;
- } /* switch */
- } /* two valid time strings */
- } /* we have a time condition */
- } /* this is HTTP */
- } /* this is the first time we write a body part */
- bodywrites++;
-
- if(data->maxdownload &&
- (bytecount + nread > data->maxdownload)) {
- nread = data->maxdownload - bytecount;
- if(nread < 0 ) /* this should be unusual */
- nread = 0;
- keepon = FALSE; /* we're done now! */
+ }
+ nread = si;
+ buf = scratch; /* point to the new buffer */
}
- bytecount += nread;
+ /* write to socket */
+#ifdef USE_SSLEAY
+ if (data->use_ssl) {
+ bytes_written = SSL_write(data->ssl, buf, nread);
+ }
+ else {
+#endif
+ bytes_written = swrite(writesockfd, buf, nread);
+#ifdef USE_SSLEAY
+ }
+#endif /* USE_SSLEAY */
+ if(nread != bytes_written) {
+ failf(data, "Failed uploading data");
+ return URG_WRITE_ERROR;
+ }
- if (nread != data->fwrite (str, 1, nread, data->out)) {
- failf (data, "Failed writing output");
- return URG_WRITE_ERROR;
- }
+ }
- }
- break;
+ break;
}
+
now = tvnow();
if (!header) {
ProgressShow (data, bytecount, start, now, FALSE);
@@ -467,17 +548,19 @@ Download (struct UrlData *data,
#endif
}
}
- if(contentlength && (bytecount != contentlength)) {
- failf(data, "transfer closed with %d bytes remaining", contentlength-bytecount);
+ if(!(data->conf&CONF_NOBODY) && contentlength &&
+ (bytecount != contentlength)) {
+ failf(data, "transfer closed with %d bytes remaining to read",
+ contentlength-bytecount);
return URG_PARTIAL_FILE;
}
ProgressShow (data, bytecount, start, now, TRUE);
- *bytecountp = bytecount;
+ if(bytecountp)
+ *bytecountp = bytecount; /* read count */
+ if(writebytecountp)
+ *writebytecountp = writebytecount; /* write count */
-#ifdef USE_ZLIB
- gzclose(gzfile);
-#endif
return URG_OK;
}
diff --git a/lib/download.h b/lib/download.h
index e8ca82add892616b3921f606ca6faf1ff8a4afde..414085df469638d7327c96e4e19ff2c094655841 100644
--- a/lib/download.h
+++ b/lib/download.h
@@ -40,11 +40,14 @@
* ------------------------------------------------------------
****************************************************************************/
UrgError
-Download (struct UrlData *data,
- int sockfd, /* socket to read from */
+Transfer (struct UrlData *data,
+ int sockfd, /* socket to read from or -1 */
int size, /* -1 if unknown at this point */
bool getheader, /* TRUE if header parsing is wanted */
- long *bytecountp /* return number of bytes read */
+ long *bytecountp, /* return number of bytes read */
+ int writesockfd, /* socket to write to, it may very well be
+ the same we read from. -1 disables */
+ long *writebytecountp /* return number of bytes written */
);
#endif