*/
/*
- Utilities used in rsync
+ socket and pipe IO utilities used in rsync
tridge, June 1996
*/
extern struct stats stats;
static int buffer_f_in = -1;
+static int io_error_fd = -1;
+
+static void read_loop(int fd, char *buf, int len);
void setup_readbuffer(int f_in)
{
if (last_io && io_timeout && (t-last_io) >= io_timeout) {
rprintf(FERROR,"io timeout after %d second - exiting\n",
(int)(t-last_io));
- exit_cleanup(1);
+ exit_cleanup(RERR_TIMEOUT);
+ }
+}
+
+/* setup the fd used to propogate errors */
+void io_set_error_fd(int fd)
+{
+ io_error_fd = fd;
+}
+
+/* read some data from the error fd and write it to the write log code */
+static void read_error_fd(void)
+{
+ char buf[200];
+ int n;
+ int fd = io_error_fd;
+ int tag, len;
+
+ io_error_fd = -1;
+
+ read_loop(fd, buf, 4);
+ tag = IVAL(buf, 0);
+
+ len = tag & 0xFFFFFF;
+ tag = tag >> 24;
+ tag -= MPLEX_BASE;
+
+ while (len) {
+ n = len;
+ if (n > (sizeof(buf)-1)) n = sizeof(buf)-1;
+ read_loop(fd, buf, n);
+ rwrite((enum logcode)tag, buf, n);
+ len -= n;
}
+
+ io_error_fd = fd;
}
-static char *read_buffer;
-static char *read_buffer_p;
-static int read_buffer_len;
-static int read_buffer_size;
static int no_flush;
-static int no_flush_read;
/* read from a socket with IO timeout. return the number of
bytes read. If no bytes can be read then exit, never return
{
int n, ret=0;
- no_flush_read++;
io_flush();
- no_flush_read--;
while (ret == 0) {
fd_set fds;
struct timeval tv;
+ int fd_count = fd+1;
FD_ZERO(&fds);
FD_SET(fd, &fds);
+ if (io_error_fd != -1) {
+ FD_SET(io_error_fd, &fds);
+ if (io_error_fd > fd) fd_count = io_error_fd+1;
+ }
+
tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
tv.tv_usec = 0;
- if (select(fd+1, &fds, NULL, NULL, &tv) != 1) {
+ errno = 0;
+
+ if (select(fd_count, &fds, NULL, NULL, &tv) < 1) {
+ if (errno == EBADF) {
+ exit_cleanup(RERR_SOCKETIO);
+ }
check_timeout();
continue;
}
+ if (io_error_fd != -1 && FD_ISSET(io_error_fd, &fds)) {
+ read_error_fd();
+ }
+
+ if (!FD_ISSET(fd, &fds)) continue;
+
n = read(fd, buf, len);
if (n > 0) {
continue;
}
- if (n == -1 &&
- (errno == EAGAIN || errno == EWOULDBLOCK)) {
- /* this shouldn't happen, if it does then
- sleep for a short time to prevent us
- chewing too much CPU */
- u_sleep(100);
- continue;
- }
if (n == 0) {
if (eof_error) {
rprintf(FERROR,"unexpected EOF in read_timeout\n");
}
- exit_cleanup(1);
+ exit_cleanup(RERR_STREAMIO);
}
+ /* this prevents us trying to write errors on a dead socket */
+ io_multiplexing_close();
+
rprintf(FERROR,"read error: %s\n", strerror(errno));
- exit_cleanup(1);
+ exit_cleanup(RERR_STREAMIO);
}
return ret;
static int read_unbuffered(int fd, char *buf, int len)
{
static int remaining;
- char ibuf[4];
int tag, ret=0;
char line[1024];
continue;
}
- read_loop(fd, ibuf, 4);
- tag = IVAL(ibuf, 0);
+ read_loop(fd, line, 4);
+ tag = IVAL(line, 0);
remaining = tag & 0xFFFFFF;
tag = tag >> 24;
if (tag != FERROR && tag != FINFO) {
rprintf(FERROR,"unexpected tag %d\n", tag);
- exit_cleanup(1);
+ exit_cleanup(RERR_STREAMIO);
}
if (remaining > sizeof(line)-1) {
rprintf(FERROR,"multiplexing overflow %d\n\n",
remaining);
- exit_cleanup(1);
+ exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, line, remaining);
line[remaining] = 0;
- rprintf(tag,"%s", line);
+ rprintf((enum logcode)tag,"%s", line);
remaining = 0;
}
}
-
-/* This function was added to overcome a deadlock problem when using
- * ssh. It looks like we can't allow our receive queue to get full or
- * ssh will clag up. Uggh. */
-static void read_check(int f)
-{
- int n = 8192;
-
- if (f == -1) return;
-
- if (read_buffer_len == 0) {
- read_buffer_p = read_buffer;
- }
-
- if (n > MAX_READ_BUFFER/4)
- n = MAX_READ_BUFFER/4;
-
- if (read_buffer_p != read_buffer) {
- memmove(read_buffer,read_buffer_p,read_buffer_len);
- read_buffer_p = read_buffer;
- }
-
- if (n > (read_buffer_size - read_buffer_len)) {
- read_buffer_size += n;
- read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
- if (!read_buffer) out_of_memory("read check");
- read_buffer_p = read_buffer;
- }
-
- n = read_unbuffered(f,read_buffer+read_buffer_len,n);
- read_buffer_len += n;
-}
-
-
/* do a buffered read from fd. don't return until all N bytes
have been read. If all N can't be read then exit with an error */
static void readfd(int fd,char *buffer,int N)
int ret;
int total=0;
- if ((read_buffer_len < N) && (N < 1024)) {
- read_check(buffer_f_in);
- }
-
while (total < N) {
- if (read_buffer_len > 0 && buffer_f_in == fd) {
- ret = MIN(read_buffer_len,N-total);
- memcpy(buffer+total,read_buffer_p,ret);
- read_buffer_p += ret;
- read_buffer_len -= ret;
- total += ret;
- continue;
- }
-
- no_flush_read++;
io_flush();
- no_flush_read--;
ret = read_unbuffered(fd,buffer + total,N-total);
total += ret;
#ifdef NO_INT64
rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
- exit_cleanup(1);
+ exit_cleanup(RERR_UNSUPPORTED);
#else
if (remote_version >= 16) {
readfd(f,b,8);
fd_set w_fds, r_fds;
int fd_count, count;
struct timeval tv;
- int reading=0;
- int blocked=0;
no_flush++;
FD_ZERO(&w_fds);
FD_ZERO(&r_fds);
FD_SET(fd,&w_fds);
- fd_count = fd+1;
-
- if (!no_flush_read) {
- reading = (buffer_f_in != -1);
- }
+ fd_count = fd;
- if (reading) {
- FD_SET(buffer_f_in,&r_fds);
- if (buffer_f_in > fd)
- fd_count = buffer_f_in+1;
+ if (io_error_fd != -1) {
+ FD_SET(io_error_fd,&r_fds);
+ if (io_error_fd > fd_count)
+ fd_count = io_error_fd;
}
tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
tv.tv_usec = 0;
- count = select(fd_count,
- reading?&r_fds:NULL,
+ errno = 0;
+
+ count = select(fd_count+1,
+ io_error_fd != -1?&r_fds:NULL,
&w_fds,NULL,
&tv);
if (count <= 0) {
+ if (errno == EBADF) {
+ exit_cleanup(RERR_SOCKETIO);
+ }
check_timeout();
continue;
}
- if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
- read_check(buffer_f_in);
+ if (io_error_fd != -1 && FD_ISSET(io_error_fd, &r_fds)) {
+ read_error_fd();
}
if (FD_ISSET(fd, &w_fds)) {
- int n = (len-total)>>blocked;
- int ret = write(fd,buf+total,n?n:1);
+ int ret, n = len-total;
+
+ if (n > PIPE_BUF) n = PIPE_BUF;
- if (ret == -1 && errno == EINTR) {
- continue;
- }
+ ret = write(fd,buf+total,n?n:1);
- if (ret == -1 &&
- (errno == EAGAIN || errno == EWOULDBLOCK)) {
- blocked++;
+ if (ret == -1 && errno == EINTR) {
continue;
}
if (ret <= 0) {
rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
- exit_cleanup(1);
+ exit_cleanup(RERR_STREAMIO);
}
- blocked = 0;
total += ret;
if (io_timeout)
{
if (io_buffer) return;
multiplex_out_fd = fd;
- io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
+ io_buffer = (char *)malloc(IO_BUFFER_SIZE);
if (!io_buffer) out_of_memory("writefd");
io_buffer_count = 0;
+}
- /* leave room for the multiplex header in case it's needed */
- io_buffer += 4;
+/* write an message to a multiplexed stream. If this fails then rsync
+ exits */
+static void mplex_write(int fd, enum logcode code, char *buf, int len)
+{
+ char buffer[4096];
+ int n = len;
+
+ SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
+
+ if (n > (sizeof(buf)-4)) {
+ n = sizeof(buf)-4;
+ }
+
+ memcpy(&buffer[4], buf, n);
+ writefd_unbuffered(fd, buffer, n+4);
+
+ len -= n;
+ buf += n;
+
+ writefd_unbuffered(fd, buf, len);
}
+
void io_flush(void)
{
int fd = multiplex_out_fd;
if (!io_buffer_count || no_flush) return;
if (io_multiplexing_out) {
- SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
- writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
+ mplex_write(fd, FNONE, io_buffer, io_buffer_count);
} else {
writefd_unbuffered(fd, io_buffer, io_buffer_count);
}
{
io_flush();
if (!io_multiplexing_out) {
- free(io_buffer-4);
+ free(io_buffer);
io_buffer = NULL;
}
}
{
stats.total_written += len;
- if (!io_buffer) {
+ if (!io_buffer || fd != multiplex_out_fd) {
writefd_unbuffered(fd, buf, len);
return;
}
int len;
va_start(ap, format);
- len = vslprintf(buf, sizeof(buf)-1, format, ap);
+ len = vslprintf(buf, sizeof(buf), format, ap);
va_end(ap);
- if (len < 0) exit_cleanup(1);
+ if (len < 0) exit_cleanup(RERR_STREAMIO);
write_sbuf(fd, buf);
}
{
multiplex_in_fd = fd;
io_flush();
- if (read_buffer_len) {
- fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
- exit_cleanup(1);
- }
-
io_multiplexing_in = 1;
}
-/* write an message to the error stream */
-int io_multiplex_write(int f, char *buf, int len)
+/* write an message to the multiplexed error stream */
+int io_multiplex_write(enum logcode code, char *buf, int len)
{
if (!io_multiplexing_out) return 0;
io_flush();
-
- SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
- memcpy(io_buffer, buf, len);
-
stats.total_written += (len+4);
+ mplex_write(multiplex_out_fd, code, buf, len);
+ return 1;
+}
- writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
+/* write a message to the special error fd */
+int io_error_write(int f, enum logcode code, char *buf, int len)
+{
+ if (f == -1) return 0;
+ mplex_write(f, code, buf, len);
return 1;
}
+/* stop output multiplexing */
+void io_multiplexing_close(void)
+{
+ io_multiplexing_out = 0;
+}
+
void io_close_input(int fd)
{
buffer_f_in = -1;
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