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Make stdio functions which can be interrupted by the progressmeter timer

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recover gracefully from EINTR.
This commit is contained in:
Matt Kraai 2001-05-09 19:15:46 +00:00
parent d283e1cfe9
commit 854125f6e6
2 changed files with 98 additions and 10 deletions
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54
networking/wget.c
View File

@ -72,6 +72,50 @@ static void close_and_delete_outfile(FILE* output, char *fname_out, int do_conti
}
}
/* Read NMEMB elements of SIZE bytes into PTR from STREAM. Returns the
* number of elements read, and a short count if an eof or non-interrupt
* error is encountered. */
static size_t safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t ret = 0;
do {
clearerr(stream);
ret += fread((char *)ptr + (ret * size), size, nmemb - ret, stream);
} while (ret < nmemb && ferror(stream) && errno == EINTR);
return ret;
}
/* Write NMEMB elements of SIZE bytes from PTR to STREAM. Returns the
* number of elements written, and a short count if an eof or non-interrupt
* error is encountered. */
static size_t safe_fwrite(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t ret = 0;
do {
clearerr(stream);
ret += fwrite((char *)ptr + (ret * size), size, nmemb - ret, stream);
} while (ret < nmemb && ferror(stream) && errno == EINTR);
return ret;
}
/* Read a line or SIZE - 1 bytes into S, whichever is less, from STREAM.
* Returns S, or NULL if an eof or non-interrupt error is encountered. */
static char *safe_fgets(char *s, int size, FILE *stream)
{
char *ret;
do {
clearerr(stream);
ret = fgets(s, size, stream);
} while (ret == NULL && ferror(stream) && errno == EINTR);
return ret;
}
#define close_delete_and_die(s...) { \
close_and_delete_outfile(output, fname_out, do_continue); \
error_msg_and_die(s); }
@ -395,8 +439,8 @@ read_response: if (fgets(buf, sizeof(buf), sfp) == NULL)
progressmeter(-1);
#endif
do {
while ((filesize > 0 || !got_clen) && (n = fread(buf, 1, chunked ? (filesize > sizeof(buf) ? sizeof(buf) : filesize) : sizeof(buf), dfp)) > 0) {
fwrite(buf, 1, n, output);
while ((filesize > 0 || !got_clen) && (n = safe_fread(buf, 1, chunked ? (filesize > sizeof(buf) ? sizeof(buf) : filesize) : sizeof(buf), dfp)) > 0) {
safe_fwrite(buf, 1, n, output);
#ifdef BB_FEATURE_WGET_STATUSBAR
statbytes+=n;
#endif
@ -405,8 +449,8 @@ read_response: if (fgets(buf, sizeof(buf), sfp) == NULL)
}
if (chunked) {
fgets(buf, sizeof(buf), dfp); /* This is a newline */
fgets(buf, sizeof(buf), dfp);
safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
safe_fgets(buf, sizeof(buf), dfp);
filesize = strtol(buf, (char **) NULL, 16);
if (filesize==0) chunked = 0; /* all done! */
}
@ -733,7 +777,7 @@ progressmeter(int flag)
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: wget.c,v 1.36 2001/04/17 18:13:16 markw Exp $
* $Id: wget.c,v 1.37 2001/05/09 19:15:46 kraai Exp $
*/

54
wget.c
View File

@ -72,6 +72,50 @@ static void close_and_delete_outfile(FILE* output, char *fname_out, int do_conti
}
}
/* Read NMEMB elements of SIZE bytes into PTR from STREAM. Returns the
* number of elements read, and a short count if an eof or non-interrupt
* error is encountered. */
static size_t safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t ret = 0;
do {
clearerr(stream);
ret += fread((char *)ptr + (ret * size), size, nmemb - ret, stream);
} while (ret < nmemb && ferror(stream) && errno == EINTR);
return ret;
}
/* Write NMEMB elements of SIZE bytes from PTR to STREAM. Returns the
* number of elements written, and a short count if an eof or non-interrupt
* error is encountered. */
static size_t safe_fwrite(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t ret = 0;
do {
clearerr(stream);
ret += fwrite((char *)ptr + (ret * size), size, nmemb - ret, stream);
} while (ret < nmemb && ferror(stream) && errno == EINTR);
return ret;
}
/* Read a line or SIZE - 1 bytes into S, whichever is less, from STREAM.
* Returns S, or NULL if an eof or non-interrupt error is encountered. */
static char *safe_fgets(char *s, int size, FILE *stream)
{
char *ret;
do {
clearerr(stream);
ret = fgets(s, size, stream);
} while (ret == NULL && ferror(stream) && errno == EINTR);
return ret;
}
#define close_delete_and_die(s...) { \
close_and_delete_outfile(output, fname_out, do_continue); \
error_msg_and_die(s); }
@ -395,8 +439,8 @@ read_response: if (fgets(buf, sizeof(buf), sfp) == NULL)
progressmeter(-1);
#endif
do {
while ((filesize > 0 || !got_clen) && (n = fread(buf, 1, chunked ? (filesize > sizeof(buf) ? sizeof(buf) : filesize) : sizeof(buf), dfp)) > 0) {
fwrite(buf, 1, n, output);
while ((filesize > 0 || !got_clen) && (n = safe_fread(buf, 1, chunked ? (filesize > sizeof(buf) ? sizeof(buf) : filesize) : sizeof(buf), dfp)) > 0) {
safe_fwrite(buf, 1, n, output);
#ifdef BB_FEATURE_WGET_STATUSBAR
statbytes+=n;
#endif
@ -405,8 +449,8 @@ read_response: if (fgets(buf, sizeof(buf), sfp) == NULL)
}
if (chunked) {
fgets(buf, sizeof(buf), dfp); /* This is a newline */
fgets(buf, sizeof(buf), dfp);
safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
safe_fgets(buf, sizeof(buf), dfp);
filesize = strtol(buf, (char **) NULL, 16);
if (filesize==0) chunked = 0; /* all done! */
}
@ -733,7 +777,7 @@ progressmeter(int flag)
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: wget.c,v 1.36 2001/04/17 18:13:16 markw Exp $
* $Id: wget.c,v 1.37 2001/05/09 19:15:46 kraai Exp $
*/