X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/679e765768f85485818ecb33d084de677e3ac1a7..b9b15fb165d9adbfb56201429af2bd0f492c483c:/io.c diff --git a/io.c b/io.c index a91b3db6..bf7f3d90 100644 --- a/io.c +++ b/io.c @@ -1,64 +1,97 @@ -/* - Copyright (C) Andrew Tridgell 1996 - Copyright (C) Paul Mackerras 1996 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ +/* -*- c-file-style: "linux" -*- + * + * Copyright (C) 1996-2001 by Andrew Tridgell + * Copyright (C) Paul Mackerras 1996 + * Copyright (C) 2001, 2002 by Martin Pool + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/** + * @file io.c + * + * Socket and pipe IO utilities used in rsync. + * + * rsync provides its own multiplexing system, which is used to send + * stderr and stdout over a single socket. We need this because + * stdout normally carries the binary data stream, and stderr all our + * error messages. + * + * For historical reasons this is off during the start of the + * connection, but it's switched on quite early using + * io_start_multiplex_out() and io_start_multiplex_in(). + **/ -/* - Utilities used in rsync - - tridge, June 1996 - */ #include "rsync.h" -static int64 total_written; -static int64 total_read; +/** If no timeout is specified then use a 60 second select timeout */ +#define SELECT_TIMEOUT 60 static int io_multiplexing_out; static int io_multiplexing_in; -static int multiplex_in_fd; -static int multiplex_out_fd; +static int multiplex_in_fd = -1; +static int multiplex_out_fd = -1; static time_t last_io; +static int no_flush; +extern int bwlimit; extern int verbose; -extern int sparse_files; extern int io_timeout; - -int64 write_total(void) -{ - return total_written; -} - -int64 read_total(void) -{ - return total_read; -} - -static int buffer_f_in = -1; - -void setup_nonblocking(int f_in,int f_out) -{ - set_blocking(f_out,0); - buffer_f_in = f_in; -} +extern struct stats stats; + + +const char phase_unknown[] = "unknown"; + +/** + * The connection might be dropped at some point; perhaps because the + * remote instance crashed. Just giving the offset on the stream is + * not very helpful. So instead we try to make io_phase_name point to + * something useful. + * + * For buffered/multiplexed IO these names will be somewhat + * approximate; perhaps for ease of support we would rather make the + * buffer always flush when a single application-level IO finishes. + * + * @todo Perhaps we want some simple stack functionality, but there's + * no need to overdo it. + **/ +const char *io_write_phase = phase_unknown; +const char *io_read_phase = phase_unknown; + +/** Ignore EOF errors while reading a module listing if the remote + version is 24 or less. */ +int kludge_around_eof = False; + + +static int io_error_fd = -1; +static int io_filesfrom_f_in = -1; +static int io_filesfrom_f_out = -1; +static char io_filesfrom_buf[2048]; +static char *io_filesfrom_bp; +static char io_filesfrom_lastchar; +static int io_filesfrom_buflen; + +static void read_loop(int fd, char *buf, size_t len); static void check_timeout(void) { + extern int am_server, am_daemon; time_t t; - + + err_list_push(); + if (!io_timeout) return; if (!last_io) { @@ -68,254 +101,474 @@ static void check_timeout(void) t = time(NULL); - if (last_io && io_timeout && (t-last_io)>io_timeout) { - rprintf(FERROR,"read timeout after %d second - exiting\n", - (int)(t-last_io)); - exit_cleanup(1); + if (last_io && io_timeout && (t-last_io) >= io_timeout) { + if (!am_server && !am_daemon) { + rprintf(FERROR,"io timeout after %d seconds - exiting\n", + (int)(t-last_io)); + } + exit_cleanup(RERR_TIMEOUT); } } +/** Setup the fd used to propagate errors */ +void io_set_error_fd(int fd) +{ + io_error_fd = fd; +} -static char *read_buffer; -static char *read_buffer_p; -static int read_buffer_len; -static int read_buffer_size; +/** Read some data from the error fd and write it to the write log code */ +static void read_error_fd(void) +{ + char buf[200]; + size_t n; + int fd = io_error_fd; + int tag, len; + /* io_error_fd is temporarily disabled -- is this meant to + * prevent indefinite recursion? */ + io_error_fd = -1; + + read_loop(fd, buf, 4); + tag = IVAL(buf, 0); + + len = tag & 0xFFFFFF; + tag = tag >> 24; + tag -= MPLEX_BASE; -/* continue trying to read len bytes - don't return until len - has been read */ -static void read_loop(int fd, char *buf, int len) -{ while (len) { - int n = read(fd, buf, 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; +} + +/** + * When we're the receiver and we have a local --files-from list of names + * that needs to be sent over the socket to the sender, we have to do two + * things at the same time: send the sender a list of what files we're + * processing and read the incoming file+info list from the sender. We do + * this by augmenting the read_timeout() function to copy this data. It + * uses the io_filesfrom_buf to read a block of data from f_in (when it is + * ready, since it might be a pipe) and then blast it out f_out (when it + * is ready to receive more data). + */ +void io_set_filesfrom_fds(int f_in, int f_out) +{ + io_filesfrom_f_in = f_in; + io_filesfrom_f_out = f_out; + io_filesfrom_bp = io_filesfrom_buf; + io_filesfrom_lastchar = '\0'; + io_filesfrom_buflen = 0; +} + +/** + * It's almost always an error to get an EOF when we're trying to read + * from the network, because the protocol is self-terminating. + * + * However, there is one unfortunate cases where it is not, which is + * rsync <2.4.6 sending a list of modules on a server, since the list + * is terminated by closing the socket. So, for the section of the + * program where that is a problem (start_socket_client), + * kludge_around_eof is True and we just exit. + */ +static void whine_about_eof(void) +{ + if (kludge_around_eof) + exit_cleanup(0); + else { + rprintf(FERROR, + "%s: connection unexpectedly closed " + "(%.0f bytes read so far)\n", + RSYNC_NAME, (double)stats.total_read); + + exit_cleanup(RERR_STREAMIO); + } +} + + +static void die_from_readerr(int err) +{ + /* this prevents us trying to write errors on a dead socket */ + io_multiplexing_close(); + + rprintf(FERROR, "%s: read error: %s\n", + RSYNC_NAME, strerror(err)); + exit_cleanup(RERR_STREAMIO); +} + + +/** + * Read from a socket with IO timeout. return the number of bytes + * read. If no bytes can be read then exit, never return a number <= 0. + * + * TODO: If the remote shell connection fails, then current versions + * actually report an "unexpected EOF" error here. Since it's a + * fairly common mistake to try to use rsh when ssh is required, we + * should trap that: if we fail to read any data at all, we should + * give a better explanation. We can tell whether the connection has + * started by looking e.g. at whether the remote version is known yet. + */ +static int read_timeout(int fd, char *buf, size_t len) +{ + int n, ret=0; + + io_flush(); + + while (ret == 0) { + /* until we manage to read *something* */ + fd_set r_fds, w_fds; + struct timeval tv; + int fd_count = fd+1; + int count; + + FD_ZERO(&r_fds); + FD_SET(fd, &r_fds); + if (io_error_fd >= 0) { + FD_SET(io_error_fd, &r_fds); + if (io_error_fd >= fd_count) fd_count = io_error_fd+1; + } + if (io_filesfrom_f_out >= 0) { + int new_fd; + if (io_filesfrom_buflen == 0) { + if (io_filesfrom_f_in >= 0) { + FD_SET(io_filesfrom_f_in, &r_fds); + new_fd = io_filesfrom_f_in; + } else { + io_filesfrom_f_out = -1; + new_fd = -1; + } + } else { + FD_ZERO(&w_fds); + FD_SET(io_filesfrom_f_out, &w_fds); + new_fd = io_filesfrom_f_out; + } + if (new_fd >= fd_count) fd_count = new_fd+1; + } + + tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT; + tv.tv_usec = 0; + + errno = 0; + + count = select(fd_count, &r_fds, + io_filesfrom_buflen? &w_fds : NULL, + NULL, &tv); + + if (count == 0) { + check_timeout(); + } + + if (count <= 0) { + if (errno == EBADF) { + exit_cleanup(RERR_SOCKETIO); + } + continue; + } + + if (io_error_fd >= 0 && FD_ISSET(io_error_fd, &r_fds)) { + read_error_fd(); + } + + if (io_filesfrom_f_out >= 0) { + if (io_filesfrom_buflen) { + if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { + int l = write(io_filesfrom_f_out, + io_filesfrom_bp, + io_filesfrom_buflen); + if (l > 0) { + if (!(io_filesfrom_buflen -= l)) + io_filesfrom_bp = io_filesfrom_buf; + else + io_filesfrom_bp += l; + } else { + /* XXX should we complain? */ + io_filesfrom_f_out = -1; + } + } + } else if (io_filesfrom_f_in >= 0) { + if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { + int l = read(io_filesfrom_f_in, + io_filesfrom_buf, + sizeof io_filesfrom_buf); + if (l <= 0) { + /* Send end-of-file marker */ + io_filesfrom_buf[0] = '\0'; + io_filesfrom_buf[1] = '\0'; + io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; + io_filesfrom_f_in = -1; + } else { + extern int eol_nulls; + if (!eol_nulls) { + char *s = io_filesfrom_buf + l; + /* Transform CR and/or LF into '\0' */ + while (s-- > io_filesfrom_buf) { + if (*s == '\n' || *s == '\r') + *s = '\0'; + } + } + if (!io_filesfrom_lastchar) { + /* Last buf ended with a '\0', so don't + * let this buf start with one. */ + while (l && !*io_filesfrom_bp) + io_filesfrom_bp++, l--; + } + if (!l) + io_filesfrom_bp = io_filesfrom_buf; + else { + char *f = io_filesfrom_bp; + char *t = f; + char *eob = f + l; + /* Eliminate any multi-'\0' runs. */ + while (f != eob) { + if (!(*t++ = *f++)) { + while (f != eob && !*f) + f++, l--; + } + } + io_filesfrom_lastchar = f[-1]; + } + io_filesfrom_buflen = l; + } + } + } + } + + if (!FD_ISSET(fd, &r_fds)) continue; + + n = read(fd, buf, len); + if (n > 0) { buf += n; len -= n; + ret += n; + if (io_timeout) + last_io = time(NULL); + continue; + } else if (n == 0) { + whine_about_eof(); + return -1; /* doesn't return */ + } else if (n < 0) { + if (errno == EINTR || errno == EWOULDBLOCK || + errno == EAGAIN) + continue; + die_from_readerr(errno); } - if (n == 0) { - rprintf(FERROR,"EOF in read_loop\n"); - exit_cleanup(1); - } - if (n == -1) { - fd_set fds; - struct timeval tv; + } - if (errno != EAGAIN && errno != EWOULDBLOCK) { - rprintf(FERROR,"io error: %s\n", - strerror(errno)); - exit_cleanup(1); - } + return ret; +} +/** + * Read a line into the "fname" buffer (which must be at least MAXPATHLEN + * characters long). + */ +int read_filesfrom_line(int fd, char *fname) +{ + char ch, *s, *eob = fname + MAXPATHLEN - 1; + int cnt; + extern int io_timeout; + extern int eol_nulls; + extern char *remote_filesfrom_file; + int reading_remotely = remote_filesfrom_file != NULL; + int nulls = eol_nulls || reading_remotely; + + start: + s = fname; + while (1) { + cnt = read(fd, &ch, 1); + if (cnt < 0 && (errno == EWOULDBLOCK + || errno == EINTR || errno == EAGAIN)) { + struct timeval tv; + fd_set fds; FD_ZERO(&fds); FD_SET(fd, &fds); - tv.tv_sec = io_timeout; + tv.tv_sec = io_timeout? io_timeout : SELECT_TIMEOUT; tv.tv_usec = 0; - - if (select(fd+1, &fds, NULL, NULL, - io_timeout?&tv:NULL) != 1) { + if (!select(fd+1, &fds, NULL, NULL, &tv)) check_timeout(); - } + continue; + } + if (cnt != 1) + break; + if (nulls? !ch : (ch == '\r' || ch == '\n')) { + /* Skip empty lines if reading locally. */ + if (!reading_remotely && s == fname) + continue; + break; } + if (s < eob) + *s++ = ch; } + *s = '\0'; + + /* Dump comments. */ + if (*fname == '#' || *fname == ';') + goto start; + + return s - fname; } -static int read_unbuffered(int fd, char *buf, int len) + +/** + * Continue trying to read len bytes - don't return until len has been + * read. + **/ +static void read_loop(int fd, char *buf, size_t len) { - static int remaining; - char ibuf[4]; - int tag, ret=0; - char line[1024]; + while (len) { + int n = read_timeout(fd, buf, len); - if (!io_multiplexing_in || fd != multiplex_in_fd) - return read(fd, buf, len); + buf += n; + len -= n; + } +} + + +/** + * Read from the file descriptor handling multiplexing - return number + * of bytes read. + * + * Never returns <= 0. + */ +static int read_unbuffered(int fd, char *buf, size_t len) +{ + static size_t remaining; + int tag, ret = 0; + char line[1024]; + static char *buffer; + static size_t bufferIdx = 0; + static size_t bufferSz; + + if (fd != multiplex_in_fd) + return read_timeout(fd, buf, len); + + if (!io_multiplexing_in && remaining == 0) { + if (!buffer) { + bufferSz = 2 * IO_BUFFER_SIZE; + buffer = new_array(char, bufferSz); + if (!buffer) out_of_memory("read_unbuffered"); + } + remaining = read_timeout(fd, buffer, bufferSz); + bufferIdx = 0; + } while (ret == 0) { if (remaining) { len = MIN(len, remaining); - read_loop(fd, buf, len); + memcpy(buf, buffer + bufferIdx, len); + bufferIdx += len; remaining -= len; ret = len; - continue; + break; } - 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 == MPLEX_BASE) continue; + if (tag == MPLEX_BASE) { + if (!buffer || remaining > bufferSz) { + buffer = realloc_array(buffer, char, remaining); + if (!buffer) out_of_memory("read_unbuffered"); + bufferSz = remaining; + } + read_loop(fd, buffer, remaining); + bufferIdx = 0; + continue; + } tag -= MPLEX_BASE; if (tag != FERROR && tag != FINFO) { - rprintf(FERROR,"unexpected tag %d\n", tag); - exit_cleanup(1); + rprintf(FERROR, "unexpected tag %d\n", tag); + exit_cleanup(RERR_STREAMIO); } - if (remaining > sizeof(line)-1) { - rprintf(FERROR,"multiplexing overflow %d\n\n", - remaining); - exit_cleanup(1); + if (remaining > sizeof line - 1) { + rprintf(FERROR, "multiplexing overflow %ld\n\n", + (long)remaining); + exit_cleanup(RERR_STREAMIO); } read_loop(fd, line, remaining); line[remaining] = 0; - rprintf(tag,"%s", line); + rprintf((enum logcode) tag, "%s", line); remaining = 0; } + if (remaining == 0) + io_flush(); + return ret; } -/* 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; - - if (f == -1) return; - if (read_buffer_len == 0) { - read_buffer_p = read_buffer; - } - - if ((n=num_waiting(f)) <= 0) - return; - - /* things could deteriorate if we read in really small chunks */ - if (n < 10) n = 1024; - - 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; - if (!read_buffer) - read_buffer = (char *)malloc(read_buffer_size); - else - 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); - if (n > 0) { - read_buffer_len += n; - } -} - -static int readfd(int fd,char *buffer,int N) +/** + * Do a buffered read from @p fd. Don't return until all @p n bytes + * have been read. If all @p n can't be read then exit with an + * error. + **/ +static void readfd(int fd, char *buffer, size_t N) { int ret; - int total=0; - struct timeval tv; - - if (read_buffer_len < N) - 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; - } + size_t total=0; - io_flush(); - - while ((ret = read_unbuffered(fd,buffer + total,N-total)) == -1) { - fd_set fds; - - if (errno != EAGAIN && errno != EWOULDBLOCK) - return -1; - FD_ZERO(&fds); - FD_SET(fd, &fds); - tv.tv_sec = io_timeout; - tv.tv_usec = 0; - - if (select(fd+1, &fds, NULL, NULL, - io_timeout?&tv:NULL) != 1) { - check_timeout(); - } - } - - if (ret <= 0) - return total; + while (total < N) { + ret = read_unbuffered(fd, buffer + total, N-total); total += ret; } - if (io_timeout) - last_io = time(NULL); - return total; + stats.total_read += total; } int32 read_int(int f) { - int ret; - char b[4]; - if ((ret=readfd(f,b,4)) != 4) { - if (verbose > 1) - rprintf(FERROR,"(%d) read_int: Error reading %d bytes : %s\n", - getpid(),4,ret==-1?strerror(errno):"EOF"); - exit_cleanup(1); - } - total_read += 4; - return IVAL(b,0); + char b[4]; + int32 ret; + + readfd(f,b,4); + ret = IVAL(b,0); + if (ret == (int32)0xffffffff) return -1; + return ret; } int64 read_longint(int f) { - extern int remote_version; int64 ret; char b[8]; ret = read_int(f); - if ((int32)ret != (int32)0xffffffff) return ret; + if ((int32)ret != (int32)0xffffffff) { + return 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) { - if ((ret=readfd(f,b,8)) != 8) { - if (verbose > 1) - rprintf(FERROR,"(%d) read_longint: Error reading %d bytes : %s\n", - getpid(),8,ret==-1?strerror(errno):"EOF"); - exit_cleanup(1); - } - total_read += 8; - ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); - } + readfd(f,b,8); + ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); #endif return ret; } -void read_buf(int f,char *buf,int len) +void read_buf(int f,char *buf,size_t len) { - int ret; - if ((ret=readfd(f,buf,len)) != len) { - if (verbose > 1) - rprintf(FERROR,"(%d) read_buf: Error reading %d bytes : %s\n", - getpid(),len,ret==-1?strerror(errno):"EOF"); - exit_cleanup(1); - } - total_read += len; + readfd(f,buf,len); } -void read_sbuf(int f,char *buf,int len) +void read_sbuf(int f,char *buf,size_t len) { read_buf(f,buf,len); buf[len] = 0; @@ -323,269 +576,274 @@ void read_sbuf(int f,char *buf,int len) unsigned char read_byte(int f) { - unsigned char c; - read_buf(f,(char *)&c,1); - return c; + unsigned char c; + read_buf(f, (char *)&c, 1); + return c; } -static char last_byte; -static int last_sparse; - -int sparse_end(int f) +/** + * Sleep after writing to limit I/O bandwidth usage. + * + * @todo Rather than sleeping after each write, it might be better to + * use some kind of averaging. The current algorithm seems to always + * use a bit less bandwidth than specified, because it doesn't make up + * for slow periods. But arguably this is a feature. In addition, we + * ought to take the time used to write the data into account. + **/ +static void sleep_for_bwlimit(int bytes_written) { - if (last_sparse) { - do_lseek(f,-1,SEEK_CUR); - return (write(f,&last_byte,1) == 1 ? 0 : -1); - } - last_sparse = 0; - return 0; -} - - -static int write_sparse(int f,char *buf,int len) -{ - int l1=0,l2=0; - int ret; - - for (l1=0;l1 0) - last_sparse=1; - - if (l1 > 0) - do_lseek(f,l1,SEEK_CUR); - - if (l1 == len) - return len; - - if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) { - if (ret == -1 || ret == 0) return ret; - return (l1+ret); - } - - if (l2 > 0) - do_lseek(f,l2,SEEK_CUR); - - return len; -} + struct timeval tv; + if (!bwlimit) + return; + assert(bytes_written > 0); + assert(bwlimit > 0); -int write_file(int f,char *buf,int len) -{ - int ret = 0; + tv.tv_usec = bytes_written * 1000 / bwlimit; + tv.tv_sec = tv.tv_usec / 1000000; + tv.tv_usec = tv.tv_usec % 1000000; - if (!sparse_files) - return write(f,buf,len); - - while (len>0) { - int len1 = MIN(len, SPARSE_WRITE_SIZE); - int r1 = write_sparse(f, buf, len1); - if (r1 <= 0) { - if (ret > 0) return ret; - return r1; - } - len -= r1; - buf += r1; - ret += r1; - } - return ret; + select(0, NULL, NULL, NULL, &tv); } -static int writefd_unbuffered(int fd,char *buf,int len) +/** + * Write len bytes to the file descriptor @p fd. + * + * This function underlies the multiplexing system. The body of the + * application never calls this function directly. + **/ +static void writefd_unbuffered(int fd,char *buf,size_t len) { - int total = 0; + size_t total = 0; fd_set w_fds, r_fds; - int fd_count, count, got_select=0; + int fd_count, count; struct timeval tv; - while (total < len) { - int ret = write(fd,buf+total,len-total); + err_list_push(); - if (ret == 0) return total; + no_flush++; - if (ret == -1 && !(errno == EWOULDBLOCK || errno == EAGAIN)) - return -1; + while (total < len) { + FD_ZERO(&w_fds); + FD_SET(fd,&w_fds); + fd_count = fd; - if (ret == -1 && got_select) { - /* hmmm, we got a write select on the fd and - then failed to write. Why doesn't that - mean that the fd is dead? It doesn't on - some systems it seems (eg. IRIX) */ - u_sleep(1000); + if (io_error_fd >= 0) { + FD_ZERO(&r_fds); + FD_SET(io_error_fd,&r_fds); + if (io_error_fd > fd_count) + fd_count = io_error_fd; } - got_select = 0; - - - if (ret != -1) { - total += ret; - continue; - } + tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT; + tv.tv_usec = 0; - if (read_buffer_len < MAX_READ_BUFFER && buffer_f_in != -1) - read_check(buffer_f_in); + errno = 0; - fd_count = fd+1; - FD_ZERO(&w_fds); - FD_ZERO(&r_fds); - FD_SET(fd,&w_fds); - if (buffer_f_in != -1) { - FD_SET(buffer_f_in,&r_fds); - if (buffer_f_in > fd) - fd_count = buffer_f_in+1; - } + count = select(fd_count+1, + io_error_fd >= 0?&r_fds:NULL, + &w_fds,NULL, + &tv); - tv.tv_sec = BLOCKING_TIMEOUT; - tv.tv_usec = 0; - count = select(fd_count,buffer_f_in == -1? NULL: &r_fds, - &w_fds,NULL,&tv); - - if (count == -1 && errno != EINTR) { - if (verbose > 1) - rprintf(FERROR,"select error: %s\n", strerror(errno)); - exit_cleanup(1); - } - if (count == 0) { check_timeout(); + } + + if (count <= 0) { + if (errno == EBADF) { + exit_cleanup(RERR_SOCKETIO); + } continue; } - + + if (io_error_fd >= 0 && FD_ISSET(io_error_fd, &r_fds)) { + read_error_fd(); + } + if (FD_ISSET(fd, &w_fds)) { - got_select = 1; + int ret; + size_t n = len-total; + ret = write(fd,buf+total,n); + + if (ret < 0) { + if (errno == EINTR) + continue; + if (errno == EWOULDBLOCK || errno == EAGAIN) { + msleep(1); + continue; + } + } + + if (ret <= 0) { + /* Don't try to write errors back + * across the stream */ + io_multiplexing_close(); + rprintf(FERROR, RSYNC_NAME + ": writefd_unbuffered failed to write %ld bytes: phase \"%s\": %s\n", + (long) len, io_write_phase, + strerror(errno)); + exit_cleanup(RERR_STREAMIO); + } + + sleep_for_bwlimit(ret); + + total += ret; + + if (io_timeout) + last_io = time(NULL); } } - if (io_timeout) - last_io = time(NULL); - - return total; + no_flush--; } static char *io_buffer; static int io_buffer_count; -void io_start_buffering(int fd) +void io_start_buffering_out(int fd) { if (io_buffer) return; multiplex_out_fd = fd; - io_buffer = (char *)malloc(IO_BUFFER_SIZE+4); + io_buffer = new_array(char, IO_BUFFER_SIZE); if (!io_buffer) out_of_memory("writefd"); io_buffer_count = 0; +} + +void io_start_buffering_in(int fd) +{ + multiplex_in_fd = fd; +} + +/** + * Write an message to a multiplexed stream. If this fails then rsync + * exits. + **/ +static void mplex_write(int fd, enum logcode code, char *buf, size_t len) +{ + char buffer[4096]; + size_t n = len; + + SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); + + if (n > (sizeof buffer - 4)) { + n = sizeof buffer - 4; + } - /* leave room for the multiplex header in case it's needed */ - io_buffer += 4; + memcpy(&buffer[4], buf, n); + writefd_unbuffered(fd, buffer, n+4); + + len -= n; + buf += n; + + if (len) { + writefd_unbuffered(fd, buf, len); + } } + void io_flush(void) { int fd = multiplex_out_fd; - if (!io_buffer_count) return; + + err_list_push(); + + if (!io_buffer_count || no_flush) return; if (io_multiplexing_out) { - SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count); - if (writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4) != - io_buffer_count+4) { - rprintf(FERROR,"write failed\n"); - exit_cleanup(1); - } + mplex_write(fd, FNONE, io_buffer, io_buffer_count); } else { - if (writefd_unbuffered(fd, io_buffer, io_buffer_count) != - io_buffer_count) { - rprintf(FERROR,"write failed\n"); - exit_cleanup(1); - } + writefd_unbuffered(fd, io_buffer, io_buffer_count); } io_buffer_count = 0; } -void io_end_buffering(int fd) + +void io_end_buffering(void) { io_flush(); if (!io_multiplexing_out) { - free(io_buffer-4); + free(io_buffer); io_buffer = NULL; } } -static int writefd(int fd,char *buf,int len1) +static void writefd(int fd,char *buf,size_t len) { - int len = len1; + stats.total_written += len; - if (!io_buffer) return writefd_unbuffered(fd, buf, len); + err_list_push(); + + if (!io_buffer || fd != multiplex_out_fd) { + writefd_unbuffered(fd, buf, len); + return; + } while (len) { - int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count); + int n = MIN((int) len, IO_BUFFER_SIZE-io_buffer_count); if (n > 0) { memcpy(io_buffer+io_buffer_count, buf, n); buf += n; len -= n; io_buffer_count += n; } - + if (io_buffer_count == IO_BUFFER_SIZE) io_flush(); } - - return len1; } void write_int(int f,int32 x) { - int ret; char b[4]; SIVAL(b,0,x); - if ((ret=writefd(f,b,4)) != 4) { - rprintf(FERROR,"write_int failed : %s\n", - ret==-1?strerror(errno):"EOF"); - exit_cleanup(1); - } - total_written += 4; + writefd(f,b,4); } + +void write_int_named(int f, int32 x, const char *phase) +{ + io_write_phase = phase; + write_int(f, x); + io_write_phase = phase_unknown; +} + + +/* + * Note: int64 may actually be a 32-bit type if ./configure couldn't find any + * 64-bit types on this platform. + */ void write_longint(int f, int64 x) { - extern int remote_version; char b[8]; - int ret; - if (remote_version < 16 || x <= 0x7FFFFFFF) { + if (x <= 0x7FFFFFFF) { write_int(f, (int)x); return; } - write_int(f, -1); +#ifdef NO_INT64 + rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n"); + exit_cleanup(RERR_UNSUPPORTED); +#else + write_int(f, (int32)0xFFFFFFFF); SIVAL(b,0,(x&0xFFFFFFFF)); SIVAL(b,4,((x>>32)&0xFFFFFFFF)); - if ((ret=writefd(f,b,8)) != 8) { - rprintf(FERROR,"write_longint failed : %s\n", - ret==-1?strerror(errno):"EOF"); - exit_cleanup(1); - } - total_written += 8; + writefd(f,b,8); +#endif } -void write_buf(int f,char *buf,int len) +void write_buf(int f,char *buf,size_t len) { - int ret; - if ((ret=writefd(f,buf,len)) != len) { - rprintf(FERROR,"write_buf failed : %s\n", - ret==-1?strerror(errno):"EOF"); - exit_cleanup(1); - } - total_written += len; + writefd(f,buf,len); } -/* write a string to the connection */ -void write_sbuf(int f,char *buf) +/** Write a string to the connection */ +static void write_sbuf(int f,char *buf) { write_buf(f, buf, strlen(buf)); } @@ -596,15 +854,21 @@ void write_byte(int f,unsigned char c) write_buf(f,(char *)&c,1); } -void write_flush(int f) -{ -} -int read_line(int f, char *buf, int maxlen) +/** + * Read a line of up to @p maxlen characters into @p buf. Does not + * contain a trailing newline or carriage return. + * + * @return 1 for success; 0 for io error or truncation. + **/ +int read_line(int f, char *buf, size_t maxlen) { while (maxlen) { + buf[0] = 0; read_buf(f, buf, 1); + if (buf[0] == 0) + return 0; if (buf[0] == '\n') { buf[0] = 0; break; @@ -618,6 +882,7 @@ int read_line(int f, char *buf, int maxlen) *buf = 0; return 0; } + return 1; } @@ -627,54 +892,48 @@ void io_printf(int fd, const char *format, ...) va_list ap; char buf[1024]; int len; - + va_start(ap, format); - len = vslprintf(buf, sizeof(buf)-1, format, ap); + len = vsnprintf(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); } -/* setup for multiplexing an error stream with the data stream */ +/** Setup for multiplexing an error stream with the data stream */ void io_start_multiplex_out(int fd) { multiplex_out_fd = fd; io_flush(); - io_start_buffering(fd); + io_start_buffering_out(fd); io_multiplexing_out = 1; } -/* setup for multiplexing an error stream with the data stream */ +/** Setup for multiplexing an error stream with the data stream */ void io_start_multiplex_in(int fd) { 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, size_t len) { if (!io_multiplexing_out) return 0; io_flush(); - - SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len); - memcpy(io_buffer, buf, len); - - writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4); + stats.total_written += (len+4); + mplex_write(multiplex_out_fd, code, buf, len); return 1; } -void io_close_input(int fd) +/** Stop output multiplexing */ +void io_multiplexing_close(void) { - buffer_f_in = -1; + io_multiplexing_out = 0; } +