Annotation of qemu/migration-tcp.c, revision 1.1.1.7

1.1       root        1: /*
                      2:  * QEMU live migration
                      3:  *
                      4:  * Copyright IBM, Corp. 2008
                      5:  *
                      6:  * Authors:
                      7:  *  Anthony Liguori   <aliguori@us.ibm.com>
                      8:  *
                      9:  * This work is licensed under the terms of the GNU GPL, version 2.  See
                     10:  * the COPYING file in the top-level directory.
                     11:  *
1.1.1.7 ! root       12:  * Contributions after 2012-01-13 are licensed under the terms of the
        !            13:  * GNU GPL, version 2 or (at your option) any later version.
1.1       root       14:  */
                     15: 
                     16: #include "qemu-common.h"
                     17: #include "qemu_socket.h"
                     18: #include "migration.h"
                     19: #include "qemu-char.h"
                     20: #include "buffered_file.h"
                     21: #include "block.h"
                     22: 
                     23: //#define DEBUG_MIGRATION_TCP
                     24: 
                     25: #ifdef DEBUG_MIGRATION_TCP
1.1.1.4   root       26: #define DPRINTF(fmt, ...) \
1.1       root       27:     do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
                     28: #else
1.1.1.4   root       29: #define DPRINTF(fmt, ...) \
1.1       root       30:     do { } while (0)
                     31: #endif
                     32: 
1.1.1.6   root       33: static int socket_errno(MigrationState *s)
1.1       root       34: {
                     35:     return socket_error();
                     36: }
                     37: 
1.1.1.6   root       38: static int socket_write(MigrationState *s, const void * buf, size_t size)
1.1       root       39: {
                     40:     return send(s->fd, buf, size, 0);
                     41: }
                     42: 
1.1.1.6   root       43: static int tcp_close(MigrationState *s)
1.1       root       44: {
1.1.1.7 ! root       45:     int r = 0;
1.1.1.4   root       46:     DPRINTF("tcp_close\n");
1.1       root       47:     if (s->fd != -1) {
1.1.1.7 ! root       48:         if (close(s->fd) < 0) {
        !            49:             r = -errno;
        !            50:         }
1.1       root       51:         s->fd = -1;
                     52:     }
1.1.1.7 ! root       53:     return r;
1.1       root       54: }
                     55: 
                     56: static void tcp_wait_for_connect(void *opaque)
                     57: {
1.1.1.6   root       58:     MigrationState *s = opaque;
1.1       root       59:     int val, ret;
                     60:     socklen_t valsize = sizeof(val);
                     61: 
1.1.1.4   root       62:     DPRINTF("connect completed\n");
1.1       root       63:     do {
1.1.1.2   root       64:         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
1.1.1.6   root       65:     } while (ret == -1 && (socket_error()) == EINTR);
1.1       root       66: 
                     67:     if (ret < 0) {
                     68:         migrate_fd_error(s);
                     69:         return;
                     70:     }
                     71: 
                     72:     qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
                     73: 
                     74:     if (val == 0)
                     75:         migrate_fd_connect(s);
                     76:     else {
1.1.1.4   root       77:         DPRINTF("error connecting %d\n", val);
1.1       root       78:         migrate_fd_error(s);
                     79:     }
                     80: }
                     81: 
1.1.1.7 ! root       82: int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
        !            83:                                  Error **errp)
1.1       root       84: {
                     85:     s->get_error = socket_errno;
                     86:     s->write = socket_write;
                     87:     s->close = tcp_close;
1.1.1.6   root       88: 
1.1.1.7 ! root       89:     s->fd = inet_connect(host_port, false, errp);
1.1       root       90: 
1.1.1.7 ! root       91:     if (!error_is_set(errp)) {
        !            92:         migrate_fd_connect(s);
        !            93:     } else if (error_is_type(*errp, QERR_SOCKET_CONNECT_IN_PROGRESS)) {
        !            94:         DPRINTF("connect in progress\n");
        !            95:         qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
        !            96:     } else if (error_is_type(*errp, QERR_SOCKET_CREATE_FAILED)) {
        !            97:         DPRINTF("connect failed\n");
        !            98:         return -1;
        !            99:     } else if (error_is_type(*errp, QERR_SOCKET_CONNECT_FAILED)) {
1.1.1.4   root      100:         DPRINTF("connect failed\n");
                    101:         migrate_fd_error(s);
1.1.1.7 ! root      102:         return -1;
        !           103:     } else {
        !           104:         DPRINTF("unknown error\n");
        !           105:         return -1;
1.1.1.6   root      106:     }
1.1.1.7 ! root      107: 
1.1.1.6   root      108:     return 0;
1.1       root      109: }
                    110: 
                    111: static void tcp_accept_incoming_migration(void *opaque)
                    112: {
                    113:     struct sockaddr_in addr;
                    114:     socklen_t addrlen = sizeof(addr);
1.1.1.5   root      115:     int s = (intptr_t)opaque;
1.1       root      116:     QEMUFile *f;
1.1.1.4   root      117:     int c;
1.1       root      118: 
                    119:     do {
1.1.1.3   root      120:         c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
1.1       root      121:     } while (c == -1 && socket_error() == EINTR);
                    122: 
1.1.1.4   root      123:     DPRINTF("accepted migration\n");
1.1       root      124: 
                    125:     if (c == -1) {
                    126:         fprintf(stderr, "could not accept migration connection\n");
1.1.1.4   root      127:         goto out2;
1.1       root      128:     }
                    129: 
                    130:     f = qemu_fopen_socket(c);
                    131:     if (f == NULL) {
                    132:         fprintf(stderr, "could not qemu_fopen socket\n");
                    133:         goto out;
                    134:     }
                    135: 
1.1.1.4   root      136:     process_incoming_migration(f);
1.1       root      137:     qemu_fclose(f);
                    138: out:
                    139:     close(c);
1.1.1.4   root      140: out2:
                    141:     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
                    142:     close(s);
1.1       root      143: }
                    144: 
1.1.1.7 ! root      145: int tcp_start_incoming_migration(const char *host_port, Error **errp)
1.1       root      146: {
                    147:     int s;
                    148: 
1.1.1.7 ! root      149:     s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
1.1       root      150: 
1.1.1.7 ! root      151:     if (s < 0) {
        !           152:         return -1;
1.1.1.6   root      153:     }
1.1       root      154: 
                    155:     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
1.1.1.5   root      156:                          (void *)(intptr_t)s);
1.1       root      157: 
                    158:     return 0;
                    159: }

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