/* *------------------------------------------------------------------ * Copyright (c) 2017 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------ */ #define _GNU_SOURCE #include <sys/socket.h> #include <sys/types.h> #include <sys/un.h> #include <string.h> #include <stdio.h> #include <stdlib.h> #include <net/if.h> #include <sys/ioctl.h> #include <sys/uio.h> #include <sys/mman.h> #include <sys/prctl.h> #include <fcntl.h> #include <errno.h> #include <socket.h> #include <memif.h> #include <memif_private.h> /* sends msg to socket */ static_fn int memif_msg_send (int fd, memif_msg_t * msg, int afd) { struct msghdr mh = { 0 }; struct iovec iov[1]; char ctl[CMSG_SPACE (sizeof (int))]; int rv, err = MEMIF_ERR_SUCCESS; /* 0 */ iov[0].iov_base = (void *) msg; iov[0].iov_len = sizeof (memif_msg_t); mh.msg_iov = iov; mh.msg_iovlen = 1; if (afd > 0) { struct cmsghdr *cmsg; memset (&ctl, 0, sizeof (ctl)); mh.msg_control = ctl; mh.msg_controllen = sizeof (ctl); cmsg = CMSG_FIRSTHDR (&mh); cmsg->cmsg_len = CMSG_LEN (sizeof (int)); cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = SCM_RIGHTS; memcpy (CMSG_DATA (cmsg), &afd, sizeof (int)); } rv = sendmsg (fd, &mh, 0); if (rv < 0) err = memif_syscall_error_handler (errno); DBG ("Message type %u sent", msg->type); return err; } /* response from memif master - master is ready to handle next message */ static_fn int memif_msg_enq_ack (memif_connection_t * c) { libmemif_main_t *lm = &libmemif_main; memif_msg_queue_elt_t *e = (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); if (e == NULL) return memif_syscall_error_handler (errno); memset (&e->msg, 0, sizeof (e->msg)); e->msg.type = MEMIF_MSG_TYPE_ACK; e->fd = -1; e->next = NULL; if (c->msg_queue == NULL) { c->msg_queue = e; return MEMIF_ERR_SUCCESS; /* 0 */ } memif_msg_queue_elt_t *cur = c->msg_queue; while (cur->next != NULL) { cur = cur->next; } cur->next = e; return MEMIF_ERR_SUCCESS; /* 0 */ } static_fn int memif_msg_send_hello (int fd) { libmemif_main_t *lm = &libmemif_main; memif_msg_t msg = { 0 }; memif_msg_hello_t *h = &msg.hello; msg.type = MEMIF_MSG_TYPE_HELLO; h->min_version = MEMIF_VERSION; h->max_version = MEMIF_VERSION; h->max_s2m_ring = MEMIF_MAX_S2M_RING; h->max_m2s_ring = MEMIF_MAX_M2S_RING; h->max_region = MEMIF_MAX_REGION; h->max_log2_ring_size = MEMIF_MAX_LOG2_RING_SIZE; strncpy ((char *) h->name, (char *) lm->app_name, strlen ((char *) lm->app_name)); /* msg hello is not enqueued but sent directly, because it is the first msg to be sent */ return memif_msg_send (fd, &msg, -1); } /* send id and secret (optional) for interface identification */ static_fn int memif_msg_enq_init (memif_connection_t * c) { libmemif_main_t *lm = &libmemif_main; memif_msg_queue_elt_t *e = (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); if (e == NULL) return memif_syscall_error_handler (errno); memset (e, 0, sizeof (memif_msg_queue_elt_t)); memset (&e->msg, 0, sizeof (e->msg)); memif_msg_init_t *i = &e->msg.init; e->msg.type = MEMIF_MSG_TYPE_INIT; e->fd = -1; i->version = MEMIF_VERSION; i->id = c->args.interface_id; i->mode = c->args.mode; strncpy ((char *) i->name, (char *) lm->app_name, strlen ((char *) lm->app_name)); if (strlen ((char *) c->args.secret) > 0) strncpy ((char *) i->secret, (char *) c->args.secret, sizeof (i->secret)); e->next = NULL; if (c->msg_queue == NULL) { c->msg_queue = e; return MEMIF_ERR_SUCCESS; /* 0 */ } memif_msg_queue_elt_t *cur = c->msg_queue; while (cur->next != NULL) { cur = cur->next; } cur->next = e; return MEMIF_ERR_SUCCESS; /* 0 */ } /* send information about region specified by region_index */ static_fn int memif_msg_enq_add_region (memif_connection_t * c, uint8_t region_index) { libmemif_main_t *lm = &libmemif_main; memif_region_t *mr = &c->regions[region_index]; memif_msg_queue_elt_t *e = (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); if (e == NULL) return memif_syscall_error_handler (errno); memset (&e->msg, 0, sizeof (e->msg)); memif_msg_add_region_t *ar = &e->msg.add_region; e->msg.type = MEMIF_MSG_TYPE_ADD_REGION; e->fd = mr->fd; ar->index = region_index; ar->size = mr->region_size; e->next = NULL; if (c->msg_queue == NULL) { c->msg_queue = e; return MEMIF_ERR_SUCCESS; /* 0 */ } memif_msg_queue_elt_t *cur = c->msg_queue; while (cur->next != NULL) { cur = cur->next; } cur->next = e; return MEMIF_ERR_SUCCESS; /* 0 */ } /* send information about ring specified by direction (S2M | M2S) and index */ static_fn int memif_msg_enq_add_ring (memif_connection_t * c, uint8_t index, uint8_t dir) { libmemif_main_t *lm = &libmemif_main; memif_msg_queue_elt_t *e = (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); if (e == NULL) return memif_syscall_error_handler (errno); memset (&e->msg, 0, sizeof (e->msg)); memif_msg_add_ring_t *ar = &e->msg.add_ring; e->msg.type = MEMIF_MSG_TYPE_ADD_RING; /* TODO: support multiple rings */ memif_queue_t *mq; if (dir == MEMIF_RING_M2S) mq = &c->rx_queues[index]; else mq = &c->tx_queues[index]; e->fd = mq->int_fd; ar->index = index; ar->offset = mq->offset; ar->region = mq->region; ar->log2_ring_size = mq->log2_ring_size; ar->flags = (dir == MEMIF_RING_S2M) ? MEMIF_MSG_ADD_RING_FLAG_S2M : 0; ar->private_hdr_size = 0; e->next = NULL; if (c->msg_queue == NULL) { c->msg_queue = e; return MEMIF_ERR_SUCCESS; /* 0 */ } memif_msg_queue_elt_t *cur = c->msg_queue; while (cur->next != NULL) { cur = cur->next; } cur->next = e; return MEMIF_ERR_SUCCESS; /* 0 */ } /* used as connection request from slave */ static_fn int memif_msg_enq_connect (memif_connection_t * c) { libmemif_main_t *lm = &libmemif_main; memif_msg_queue_elt_t *e = (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); if (e == NULL) return memif_syscall_error_handler (errno); memset (&e->msg, 0, sizeof (e->msg)); memif_msg_connect_t *cm = &e->msg.connect; e->msg.type = MEMIF_MSG_TYPE_CONNECT; e->fd = -1; strncpy ((char *) cm->if_name, (char *) c->args.interface_name, strlen ((char *) c->args.interface_name)); e->next = NULL; if (c->msg_queue == NULL) { c->msg_queue = e; return MEMIF_ERR_SUCCESS; /* 0 */ } memif_msg_queue_elt_t *cur = c->msg_queue; while (cur->next != NULL) { cur = cur->next; } cur->next = e; return MEMIF_ERR_SUCCESS; /* 0 */ } /* used as confirmation of connection by master */ static_fn int memif_msg_enq_connected (memif_connection_t * c) { libmemif_main_t *lm = &libmemif_main; memif_msg_queue_elt_t *e = (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); if (e == NULL) return memif_syscall_error_handler (errno); memset (&e->msg, 0, sizeof (e->msg)); memif_msg_connected_t *cm = &e->msg.connected; e->msg.type = MEMIF_MSG_TYPE_CONNECTED; e->fd = -1; strncpy ((char *) cm->if_name, (char *) c->args.interface_name, strlen ((char *) c->args.interface_name)); e->next = NULL; if (c->msg_queue == NULL) { c->msg_queue = e; return MEMIF_ERR_SUCCESS; /* 0 */ } memif_msg_queue_elt_t *cur = c->msg_queue; while (cur->next != NULL) { cur = cur->next; } cur->next = e; return MEMIF_ERR_SUCCESS; /* 0 */ } /* immediately send disconnect msg */ /* specifie protocol for disconnect msg err_code so that it will be compatible with VPP? (header/doc) */ int memif_msg_send_disconnect (int fd, uint8_t * err_string, uint32_t err_code) { memif_msg_t msg = { 0 }; memif_msg_disconnect_t *d = &msg.disconnect; msg.type = MEMIF_MSG_TYPE_DISCONNECT; d->code = err_code; uint16_t l = strlen ((char *) err_string); if (l > 96) { DBG ("Disconnect string too long. Sending first 96 characters."); l = 96; } strncpy ((char *) d->string, (char *) err_string, l); return memif_msg_send (fd, &msg, -1); } static_fn int memif_msg_receive_hello (memif_connection_t * c, memif_msg_t * msg) { memif_msg_hello_t *h = &msg->hello; if (msg->hello.min_version > MEMIF_VERSION || msg->hello.max_version < MEMIF_VERSION) { DBG ("incompatible protocol version"); return MEMIF_ERR_PROTO; } c->run_args.num_s2m_rings = memif_min (h->max_s2m_ring + 1, c->args.num_s2m_rings); c->run_args.num_m2s_rings = memif_min (h->max_m2s_ring + 1, c->args.num_m2s_rings); c->run_args.log2_ring_size = memif_min (h->max_log2_ring_size, c->args.log2_ring_size); c->run_args.buffer_size = c->args.buffer_size; strncpy ((char *) c->remote_name, (char *) h->name, strlen ((char *) h->name)); return MEMIF_ERR_SUCCESS; /* 0 */ } /* handle interface identification (id, secret (optional)) */ static_fn int memif_msg_receive_init (memif_socket_t * ms, int fd, memif_msg_t * msg) { memif_msg_init_t *i = &msg->init; memif_list_elt_t *elt = NULL; memif_list_elt_t elt2; memif_connection_t *c = NULL; libmemif_main_t *lm = &libmemif_main; uint8_t err_string[96]; memset (err_string, 0, sizeof (char) * 96); int err = MEMIF_ERR_SUCCESS; /* 0 */ if (i->version != MEMIF_VERSION) { DBG ("MEMIF_VER_ERR"); strncpy ((char *) err_string, MEMIF_VER_ERR, strlen (MEMIF_VER_ERR)); err = MEMIF_ERR_PROTO; goto error; } get_list_elt (&elt, ms->interface_list, ms->interface_list_len, i->id); if (elt == NULL) { DBG ("MEMIF_ID_ERR"); strncpy ((char *) err_string, MEMIF_ID_ERR, strlen (MEMIF_ID_ERR)); err = MEMIF_ERR_ID; goto error; } c = (memif_connection_t *) elt->data_struct; if (!(c->args.is_master)) { DBG ("MEMIF_SLAVE_ERR"); strncpy ((char *) err_string, MEMIF_SLAVE_ERR, strlen (MEMIF_SLAVE_ERR)); err = MEMIF_ERR_ACCSLAVE; goto error; } if (c->fd != -1) { DBG ("MEMIF_CONN_ERR"); strncpy ((char *) err_string, MEMIF_CONN_ERR, strlen (MEMIF_CONN_ERR)); err = MEMIF_ERR_ALRCONN; goto error; } c->fd = fd; if (i->mode != c->args.mode) { DBG ("MEMIF_MODE_ERR"); strncpy ((char *) err_string, MEMIF_MODE_ERR, strlen (MEMIF_MODE_ERR)); err = MEMIF_ERR_MODE; goto error; } strncpy ((char *) c->remote_name, (char *) i->name, strlen ((char *) i->name)); if (strlen ((char *) c->args.secret) > 0) { int r; if (strlen ((char *) i->secret) > 0) { if (strlen ((char *) c->args.secret) != strlen ((char *) i->secret)) { DBG ("MEMIF_SECRET_ERR"); strncpy ((char *) err_string, MEMIF_SECRET_ERR, strlen (MEMIF_SECRET_ERR)); err = MEMIF_ERR_SECRET; goto error; } r = strncmp ((char *) i->secret, (char *) c->args.secret, strlen ((char *) c->args.secret)); if (r != 0) { DBG ("MEMIF_SECRET_ERR"); strncpy ((char *) err_string, MEMIF_SECRET_ERR, strlen (MEMIF_SECRET_ERR)); err = MEMIF_ERR_SECRET; goto error; } } else { DBG ("MEMIF_NOSECRET_ERR"); strncpy ((char *) err_string, MEMIF_NOSECRET_ERR, strlen (MEMIF_NOSECRET_ERR)); err = MEMIF_ERR_NOSECRET; goto error; } } c->read_fn = memif_conn_fd_read_ready; c->write_fn = memif_conn_fd_write_ready; c->error_fn = memif_conn_fd_error; elt2.key = c->fd; elt2.data_struct = c; add_list_elt (&elt2, &lm->control_list, &lm->control_list_len); free_list_elt (lm->pending_list, lm->pending_list_len, fd); return err; error: memif_msg_send_disconnect (fd, err_string, 0); lm->control_fd_update (fd, MEMIF_FD_EVENT_DEL); free_list_elt (lm->pending_list, lm->pending_list_len, fd); close (fd); fd = -1; return err; } /* receive region information and add new region to connection (if possible) */ static_fn int memif_msg_receive_add_region (memif_connection_t * c, memif_msg_t * msg, int fd) { libmemif_main_t *lm = &libmemif_main; memif_msg_add_region_t *ar = &msg->add_region; memif_region_t *mr; if (fd < 0) return MEMIF_ERR_NO_SHMFD; if (ar->index > MEMIF_MAX_REGION) return MEMIF_ERR_MAXREG; mr = (memif_region_t *) lm->realloc (c->regions, sizeof (memif_region_t) * (++c->regions_num)); if (mr == NULL) return memif_syscall_error_handler (errno); memset (mr + ar->index, 0, sizeof (memif_region_t)); c->regions = mr; c->regions[ar->index].fd = fd; c->regions[ar->index].region_size = ar->size; c->regions[ar->index].addr = NULL; /* region 0 is never external */ if (lm->get_external_region_addr && (ar->index != 0)) c->regions[ar->index].is_external = 1; return MEMIF_ERR_SUCCESS; /* 0 */ } /* receive ring information and add new ring to connection queue (based on direction S2M | M2S) */ static_fn int memif_msg_receive_add_ring (memif_connection_t * c, memif_msg_t * msg, int fd) { libmemif_main_t *lm = &libmemif_main; memif_msg_add_ring_t *ar = &msg->add_ring; memif_queue_t *mq; if (fd < 0) return MEMIF_ERR_NO_INTFD; if (ar->private_hdr_size != 0) return MEMIF_ERR_PRIVHDR; if (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M) { if (ar->index > MEMIF_MAX_S2M_RING) return MEMIF_ERR_MAXRING; if (ar->index >= c->args.num_s2m_rings) return MEMIF_ERR_MAXRING; mq = (memif_queue_t *) lm->realloc (c->rx_queues, sizeof (memif_queue_t) * (++c->rx_queues_num)); memset (mq + ar->index, 0, sizeof (memif_queue_t)); if (mq == NULL) return memif_syscall_error_handler (errno); c->rx_queues = mq; c->rx_queues[ar->index].int_fd = fd; c->rx_queues[ar->index].log2_ring_size = ar->log2_ring_size; c->rx_queues[ar->index].region = ar->region; c->rx_queues[ar->index].offset = ar->offset; c->run_args.num_s2m_rings++; } else { if (ar->index > MEMIF_MAX_M2S_RING) return MEMIF_ERR_MAXRING; if (ar->index >= c->args.num_m2s_rings) return MEMIF_ERR_MAXRING; mq = (memif_queue_t *) lm->realloc (c->tx_queues, sizeof (memif_queue_t) * (++c->tx_queues_num)); memset (mq + ar->index, 0, sizeof (memif_queue_t)); if (mq == NULL) return memif_syscall_error_handler (errno); c->tx_queues = mq; c->tx_queues[ar->index].int_fd = fd; c->tx_queues[ar->index].log2_ring_size = ar->log2_ring_size; c->tx_queues[ar->index].region = ar->region; c->tx_queues[ar->index].offset = ar->offset; c->run_args.num_m2s_rings++; } return MEMIF_ERR_SUCCESS; /* 0 */ } /* slave -> master */ static_fn int memif_msg_receive_connect (memif_connection_t * c, memif_msg_t * msg) { memif_msg_connect_t *cm = &msg->connect; libmemif_main_t *lm = &libmemif_main; memif_list_elt_t elt; int err; err = memif_connect1 (c); if (err != MEMIF_ERR_SUCCESS) return err; strncpy ((char *) c->remote_if_name, (char *) cm->if_name, strlen ((char *) cm->if_name)); int i; if (c->on_interrupt != NULL) { for (i = 0; i < c->run_args.num_m2s_rings; i++) { elt.key = c->rx_queues[i].int_fd; elt.data_struct = c; add_list_elt (&elt, &lm->interrupt_list, &lm->interrupt_list_len); lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ); } } c->on_connect ((void *) c, c->private_ctx); return err; } /* master -> slave */ static_fn int memif_msg_receive_connected (memif_connection_t * c, memif_msg_t * msg) { memif_msg_connect_t *cm = &msg->connect; libmemif_main_t *lm = &libmemif_main; int err; err = memif_connect1 (c); if (err != MEMIF_ERR_SUCCESS) return err; strncpy ((char *) c->remote_if_name, (char *) cm->if_name, strlen ((char *) cm->if_name)); int i; if (c->on_interrupt != NULL) { for (i = 0; i < c->run_args.num_s2m_rings; i++) { lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ); } } c->on_connect ((void *) c, c->private_ctx); return err; } static_fn int memif_msg_receive_disconnect (memif_connection_t * c, memif_msg_t * msg) { memif_msg_disconnect_t *d = &msg->disconnect; memset (c->remote_disconnect_string, 0, sizeof (c->remote_disconnect_string)); strncpy ((char *) c->remote_disconnect_string, (char *) d->string, strlen ((char *) d->string)); /* on returning error, handle function will call memif_disconnect () */ DBG ("disconnect received: %s, mode: %d", c->remote_disconnect_string, c->args.mode); return MEMIF_ERR_DISCONNECT; } static_fn int memif_msg_receive (int ifd) { char ctl[CMSG_SPACE (sizeof (int)) + CMSG_SPACE (sizeof (struct ucred))] = { 0 }; struct msghdr mh = { 0 }; struct iovec iov[1]; memif_msg_t msg = { 0 }; ssize_t size; int err = MEMIF_ERR_SUCCESS; /* 0 */ int fd = -1; int i; libmemif_main_t *lm = &libmemif_main; memif_connection_t *c = NULL; memif_socket_t *ms = NULL; memif_list_elt_t *elt = NULL; iov[0].iov_base = (void *) &msg; iov[0].iov_len = sizeof (memif_msg_t); mh.msg_iov = iov; mh.msg_iovlen = 1; mh.msg_control = ctl; mh.msg_controllen = sizeof (ctl); DBG ("recvmsg fd %d", ifd); size = recvmsg (ifd, &mh, 0); DBG ("done"); if (size != sizeof (memif_msg_t)) { if (size == 0) return MEMIF_ERR_DISCONNECTED; else return MEMIF_ERR_MFMSG; } struct cmsghdr *cmsg; cmsg = CMSG_FIRSTHDR (&mh); while (cmsg) { if (cmsg->cmsg_level == SOL_SOCKET) { if (cmsg->cmsg_type == SCM_CREDENTIALS) { /* Do nothing */ ; } else if (cmsg->cmsg_type == SCM_RIGHTS) { int *fdp = (int *) CMSG_DATA (cmsg); fd = *fdp; } } cmsg = CMSG_NXTHDR (&mh, cmsg); } DBG ("Message type %u received", msg.type); get_list_elt (&elt, lm->control_list, lm->control_list_len, ifd); if (elt != NULL) c = (memif_connection_t *) elt->data_struct; switch (msg.type) { case MEMIF_MSG_TYPE_ACK: break; case MEMIF_MSG_TYPE_HELLO: if ((err = memif_msg_receive_hello (c, &msg)) != MEMIF_ERR_SUCCESS) return err; if ((err = memif_init_regions_and_queues (c)) != MEMIF_ERR_SUCCESS) return err; if ((err = memif_msg_enq_init (c)) != MEMIF_ERR_SUCCESS) return err; for (i = 0; i < c->regions_num; i++) { if ((err = memif_msg_enq_add_region (c, i)) != MEMIF_ERR_SUCCESS) return err; } for (i = 0; i < c->run_args.num_s2m_rings; i++) { if ((err = memif_msg_enq_add_ring (c, i, MEMIF_RING_S2M)) != MEMIF_ERR_SUCCESS) return err; } for (i = 0; i < c->run_args.num_m2s_rings; i++) { if ((err = memif_msg_enq_add_ring (c, i, MEMIF_RING_M2S)) != MEMIF_ERR_SUCCESS) return err; } if ((err = memif_msg_enq_connect (c)) != MEMIF_ERR_SUCCESS) return err; break; case MEMIF_MSG_TYPE_INIT: get_list_elt (&elt, lm->pending_list, lm->pending_list_len, ifd); if (elt == NULL) return -1; ms = (memif_socket_t *) elt->data_struct; if ((err = memif_msg_receive_init (ms, ifd, &msg)) != MEMIF_ERR_SUCCESS) return err; /* c->remote_pid = cr->pid */ /* c->remote_uid = cr->uid */ /* c->remote_gid = cr->gid */ get_list_elt (&elt, lm->control_list, lm->control_list_len, ifd); if (elt == NULL) return -1; c = (memif_connection_t *) elt->data_struct; if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) return err; break; case MEMIF_MSG_TYPE_ADD_REGION: if ((err = memif_msg_receive_add_region (c, &msg, fd)) != MEMIF_ERR_SUCCESS) return err; if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) return err; break; case MEMIF_MSG_TYPE_ADD_RING: if ((err = memif_msg_receive_add_ring (c, &msg, fd)) != MEMIF_ERR_SUCCESS) return err; if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) return err; break; case MEMIF_MSG_TYPE_CONNECT: if ((err = memif_msg_receive_connect (c, &msg)) != MEMIF_ERR_SUCCESS) return err; if ((err = memif_msg_enq_connected (c)) != MEMIF_ERR_SUCCESS) return err; break; case MEMIF_MSG_TYPE_CONNECTED: if ((err = memif_msg_receive_connected (c, &msg)) != MEMIF_ERR_SUCCESS) return err; break; case MEMIF_MSG_TYPE_DISCONNECT: if ((err = memif_msg_receive_disconnect (c, &msg)) != MEMIF_ERR_SUCCESS) return err; break; default: return MEMIF_ERR_UNKNOWN_MSG;; break; } if (c != NULL) c->flags |= MEMIF_CONNECTION_FLAG_WRITE; /* libmemif_main_t *lm = &libmemif_main; lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD); */ return MEMIF_ERR_SUCCESS; /* 0 */ } int memif_conn_fd_error (memif_connection_t * c) { DBG ("connection fd error"); strncpy ((char *) c->remote_disconnect_string, "connection fd error", 19); int err = memif_disconnect_internal (c); return err; } /* calls memif_msg_receive to handle pending messages on socket */ int memif_conn_fd_read_ready (memif_connection_t * c) { int err; err = memif_msg_receive (c->fd); if (err != 0) { err = memif_disconnect_internal (c); } return err; } /* get msg from msg queue buffer and send it to socket */ int memif_conn_fd_write_ready (memif_connection_t * c) { libmemif_main_t *lm = &libmemif_main; int err = MEMIF_ERR_SUCCESS; /* 0 */ if ((c->flags & MEMIF_CONNECTION_FLAG_WRITE) == 0) goto done; memif_msg_queue_elt_t *e = c->msg_queue; if (e == NULL) goto done; c->msg_queue = c->msg_queue->next; c->flags &= ~MEMIF_CONNECTION_FLAG_WRITE; /* libmemif_main_t *lm = &libmemif_main; lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE | MEMIF_FD_EVENT_MOD); */ err = memif_msg_send (c->fd, &e->msg, e->fd); lm->free (e); goto done; done: return err; } int memif_conn_fd_accept_ready (memif_socket_t * ms) { int addr_len; struct sockaddr_un client; int conn_fd; libmemif_main_t *lm = &libmemif_main; DBG ("accept called"); addr_len = sizeof (client); conn_fd = accept (ms->fd, (struct sockaddr *) &client, (socklen_t *) & addr_len); if (conn_fd < 0) { return memif_syscall_error_handler (errno); } DBG ("accept fd %d", ms->fd); DBG ("conn fd %d", conn_fd); memif_list_elt_t elt; elt.key = conn_fd; elt.data_struct = ms; add_list_elt (&elt, &lm->pending_list, &lm->pending_list_len); lm->control_fd_update (conn_fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE); return memif_msg_send_hello (conn_fd); } int memif_read_ready (int fd) { int err; DBG ("call recv"); err = memif_msg_receive (fd); DBG ("recv finished"); return err; }