This module fails to compile with CC=clang:
make[1]: Entering directory
'/home/bill/linaro/chrisdrv/platform/linux-generic'
CC _fdserver.lo
_fdserver.c:150:17: error: cast from 'unsigned char *' to 'int *' increases
required alignment from 1 to 4 [-Werror,-Wcast-align]
fd_location = (int *)CMSG_DATA(control_message);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
_fdserver.c:221:18: error: cast from 'unsigned char *' to 'int *' increases
required alignment from 1 to 4 [-Werror,-Wcast-align]
fd_location = (int *)CMSG_DATA(control_message);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.
Makefile:911: recipe for target '_fdserver.lo' failed
make[1]: *** [_fdserver.lo] Error 1
On Fri, Aug 19, 2016 at 10:48 AM, Christophe Milard <
christophe.mil...@linaro.org> wrote:
> A fdserver is added and started at init time.
> The role of the fdserver (file descriptor server) is to enable sharing of
> file descriptors between unrelated processes: processes which wish to
> share a file descriptor may register their files descriptor to the server
> and processes wishing to use the shared file descriptors can do a lookup.
> When registration occurs, a triple {context, key, fd} is provided to
> the server. The context identifies the client and scope (i.e. shmem).
> The key is implemented as a long, and can be whatever.
> The server won't care as long as keys are unique.
> The file descriptor can be retrieved by another process providing the same
> context and key.
> Files descriptors passed this way are converted on the fly during the unix
> domain socket communication that occurs between the server and its clients.
> This is done by using the ancillary control data part of the msg.
>
> Signed-off-by: Christophe Milard <christophe.mil...@linaro.org>
> ---
> platform/linux-generic/Makefile.am | 2 +
> platform/linux-generic/_fdserver.c | 655
> +++++++++++++++++++++
> .../linux-generic/include/_fdserver_internal.h | 38 ++
> platform/linux-generic/include/odp_internal.h | 4 +
> platform/linux-generic/odp_init.c | 13 +
> 5 files changed, 712 insertions(+)
> create mode 100644 platform/linux-generic/_fdserver.c
> create mode 100644 platform/linux-generic/include/_fdserver_internal.h
>
> diff --git a/platform/linux-generic/Makefile.am b/platform/linux-generic/
> Makefile.am
> index 271f5b5..cb7c8e9 100644
> --- a/platform/linux-generic/Makefile.am
> +++ b/platform/linux-generic/Makefile.am
> @@ -112,6 +112,7 @@ odpdrvplatinclude_HEADERS = \
> $(srcdir)/include/odp/drv/plat/strong_types.h
>
> noinst_HEADERS = \
> + ${srcdir}/include/_fdserver_internal.h \
> ${srcdir}/include/odp_align_internal.h \
> ${srcdir}/include/odp_atomic_internal.h \
> ${srcdir}/include/odp_buffer_inlines.h \
> @@ -154,6 +155,7 @@ noinst_HEADERS = \
> ${srcdir}/Makefile.inc
>
> __LIB__libodp_linux_la_SOURCES = \
> + _fdserver.c \
> odp_atomic.c \
> odp_barrier.c \
> odp_buffer.c \
> diff --git a/platform/linux-generic/_fdserver.c b/platform/linux-generic/_
> fdserver.c
> new file mode 100644
> index 0000000..75035a8
> --- /dev/null
> +++ b/platform/linux-generic/_fdserver.c
> @@ -0,0 +1,655 @@
> +/* Copyright (c) 2016, Linaro Limited
> + * All rights reserved.
> + *
> + * SPDX-License-Identifier: BSD-3-Clause
> + */
> +
> +/*
> + * This file implements a file descriptor sharing server enabling
> + * sharing of file descriptors between processes, regardless of fork time.
> + *
> + * File descriptors are process scoped, but they can be "sent and
> converted
> + * on the fly" between processes using special unix domain socket
> ancillary
> + * data.
> + * The receiving process gets a file descriptor "pointing" to the same
> thing
> + * as the one sent (but the value of the file descriptor itself may be
> different
> + * from the one sent).
> + * Because ODP applications are responsible for creating ODP threads (i.e.
> + * pthreads or linux processes), ODP has no control on the order things
> happen:
> + * Nothing prevent a thread A to fork B and C, and then C creating a pktio
> + * which will be used by A and B to send/receive packets.
> + * Assuming this pktio uses a file descriptor, the latter will need to be
> + * shared between the processes, despite the "non convenient" fork time.
> + * The shared memory allocator is likely to use this as well to be able to
> + * share memory regardless of fork() time.
> + * This server handles a table of {(context,key)<-> fd} pair, and is
> + * interfaced by the following functions:
> + *
> + * _odp_fdserver_register_fd(context, key, fd_to_send);
> + * _odp_fdserver_deregister_fd(context, key);
> + * _odp_fdserver_lookup_fd(context, key);
> + *
> + * which are used to register/deregister or querry for file descriptor
> based
> + * on a context and key value couple, which has to be unique.
> + *
> + * Note again that the file descriptors stored here are local to this
> server
> + * process and get converted both when registered or looked up.
> + */
> +
> +#include <odp_posix_extensions.h>
> +#include <odp/api/spinlock.h>
> +#include <odp_internal.h>
> +#include <odp_debug_internal.h>
> +#include <_fdserver_internal.h>
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <sys/types.h>
> +#include <signal.h>
> +#include <sys/socket.h>
> +#include <sys/un.h>
> +#include <unistd.h>
> +#include <inttypes.h>
> +#include <sys/mman.h>
> +#include <sys/wait.h>
> +
> +#define FDSERVER_SOCKPATH_MAXLEN 32
> +#define FDSERVER_SOCKPATH_FORMAT "/tmp/odp-%d-fdserver"
> +#define FDSERVER_BACKLOG 5
> +
> +#ifndef MAP_ANONYMOUS
> +#define MAP_ANONYMOUS MAP_ANON
> +#endif
> +
> +/* when accessing the client functions, clients should be mutexed: */
> +odp_spinlock_t *client_lock;
> +
> +/* define the tables of file descriptors handled by this server: */
> +#define FDSERVER_MAX_ENTRIES 256
> +typedef struct fdentry_s {
> + fd_server_context_e context;
> + uint64_t key;
> + int fd;
> +} fdentry_t;
> +static fdentry_t fd_table[FDSERVER_MAX_ENTRIES];
> +static int fd_table_nb_entries;
> +
> +/*
> + * define the message struct used for communication between client and
> server
> + * (this single message is used in both direction)
> + * The file descriptors are sent out of band as ancillary data for
> conversion.
> + */
> +typedef struct fd_server_msg {
> + int command;
> + fd_server_context_e context;
> + uint64_t key;
> +} fdserver_msg_t;
> +/* possible commands are: */
> +#define FD_REGISTER_REQ 1 /* client -> server */
> +#define FD_REGISTER_ACK 2 /* server -> client */
> +#define FD_REGISTER_NACK 3 /* server -> client */
> +#define FD_LOOKUP_REQ 4 /* client -> server */
> +#define FD_LOOKUP_ACK 5 /* server -> client */
> +#define FD_LOOKUP_NACK 6 /* server -> client */
> +#define FD_DEREGISTER_REQ 7 /* client -> server */
> +#define FD_DEREGISTER_ACK 8 /* server -> client */
> +#define FD_DEREGISTER_NACK 9 /* server -> client */
> +#define FD_SERVERSTOP_REQ 10 /* client -> server (stops) */
> +
> +/*
> + * Client and server function:
> + * Send a fdserver_msg, possibly including a file descriptor, on the
> socket
> + * This function is used both by:
> + * -the client (sending a FD_REGISTER_REQ with a file descriptor to be
> shared,
> + * or FD_LOOKUP_REQ/FD_DEREGISTER_REQ without a file descirptor)
> + * -the server (sending FD_REGISTER_ACK/NACK, FD_LOOKUP_NACK,
> + * FD_DEREGISTER_ACK/NACK... without a fd or a
> + * FD_LOOKUP_ACK with a fd)
> + * This function make use of the ancillary data (control data) to pass and
> + * convert file descriptors over UNIX sockets
> + * Return -1 on error, 0 on success.
> + */
> +static int send_fdserver_msg(int sock, int command,
> + fd_server_context_e context, uint64_t key,
> + int fd_to_send)
> +{
> + struct msghdr socket_message;
> + struct iovec io_vector[1]; /* one msg frgmt only */
> + struct cmsghdr *control_message = NULL;
> + int *fd_location;
> + fdserver_msg_t msg;
> + int res;
> +
> + char ancillary_data[CMSG_SPACE(sizeof(int))];
> +
> + /* prepare the register request body (single framgent): */
> + msg.command = command;
> + msg.context = context;
> + msg.key = key;
> + io_vector[0].iov_base = &msg;
> + io_vector[0].iov_len = sizeof(fdserver_msg_t);
> +
> + /* initialize socket message */
> + memset(&socket_message, 0, sizeof(struct msghdr));
> + socket_message.msg_iov = io_vector;
> + socket_message.msg_iovlen = 1;
> +
> + if (fd_to_send >= 0) {
> + /* provide space for the ancillary data */
> + memset(ancillary_data, 0, CMSG_SPACE(sizeof(int)));
> + socket_message.msg_control = ancillary_data;
> + socket_message.msg_controllen = CMSG_SPACE(sizeof(int));
> +
> + /* initialize a single ancillary data element for fd
> passing */
> + control_message = CMSG_FIRSTHDR(&socket_message);
> + control_message->cmsg_level = SOL_SOCKET;
> + control_message->cmsg_type = SCM_RIGHTS;
> + control_message->cmsg_len = CMSG_LEN(sizeof(int));
> + fd_location = (int *)CMSG_DATA(control_message);
> + *fd_location = fd_to_send;
> + }
> + res = sendmsg(sock, &socket_message, 0);
> + if (res < 0) {
> + ODP_ERR("send_fdserver_msg: %s\n", strerror(errno));
> + return(-1);
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Client and server function
> + * Receive a fdserver_msg, possibly including a file descriptor, on the
> + * given socket.
> + * This function is used both by:
> + * -the server (receiving a FD_REGISTER_REQ with a file descriptor to be
> shared,
> + * or FD_LOOKUP_REQ, FD_DEREGISTER_REQ without a file descirptor)
> + * -the client (receiving FD_REGISTER_ACK...without a fd or a
> FD_LOOKUP_ACK with
> + * a fd)
> + * This function make use of the ancillary data (control data) to pass and
> + * convert file descriptors over UNIX sockets.
> + * Return -1 on error, 0 on success.
> + */
> +static int recv_fdserver_msg(int sock, int *command,
> + fd_server_context_e *context, uint64_t *key,
> + int *recvd_fd)
> +{
> + struct msghdr socket_message;
> + struct iovec io_vector[1]; /* one msg frgmt only */
> + struct cmsghdr *control_message = NULL;
> + int *fd_location;
> + fdserver_msg_t msg;
> + char ancillary_data[CMSG_SPACE(sizeof(int))];
> +
> + memset(&socket_message, 0, sizeof(struct msghdr));
> + memset(ancillary_data, 0, CMSG_SPACE(sizeof(int)));
> +
> + /* setup a place to fill in message contents */
> + io_vector[0].iov_base = &msg;
> + io_vector[0].iov_len = sizeof(fdserver_msg_t);
> + socket_message.msg_iov = io_vector;
> + socket_message.msg_iovlen = 1;
> +
> + /* provide space for the ancillary data */
> + socket_message.msg_control = ancillary_data;
> + socket_message.msg_controllen = CMSG_SPACE(sizeof(int));
> +
> + /* receive the message */
> + if (recvmsg(sock, &socket_message, MSG_CMSG_CLOEXEC) < 0) {
> + ODP_ERR("recv_fdserver_msg: %s\n", strerror(errno));
> + return(-1);
> + }
> +
> + *command = msg.command;
> + *context = msg.context;
> + *key = msg.key;
> +
> + /* grab the converted file descriptor (if any) */
> + *recvd_fd = -1;
> +
> + if ((socket_message.msg_flags & MSG_CTRUNC) == MSG_CTRUNC)
> + return 0;
> +
> + /* iterate ancillary elements to find the file descriptor: */
> + for (control_message = CMSG_FIRSTHDR(&socket_message);
> + control_message != NULL;
> + control_message = CMSG_NXTHDR(&socket_message,
> control_message)) {
> + if ((control_message->cmsg_level == SOL_SOCKET) &&
> + (control_message->cmsg_type == SCM_RIGHTS)) {
> + fd_location = (int *)CMSG_DATA(control_message);
> + *recvd_fd = *fd_location;
> + break;
> + }
> + }
> +
> + return 0;
> +}
> +
> +/* opens and returns a connected socket to the server */
> +static int get_socket(void)
> +{
> + char sockpath[FDSERVER_SOCKPATH_MAXLEN];
> + int s_sock; /* server socket */
> + struct sockaddr_un remote;
> + int len;
> +
> + /* construct the named socket path: */
> + snprintf(sockpath, FDSERVER_SOCKPATH_MAXLEN,
> FDSERVER_SOCKPATH_FORMAT,
> + odp_global_data.main_pid);
> +
> + s_sock = socket(AF_UNIX, SOCK_STREAM, 0);
> + if (s_sock == -1) {
> + ODP_ERR("cannot connect to server: %s\n", strerror(errno));
> + return(-1);
> + }
> +
> + remote.sun_family = AF_UNIX;
> + strcpy(remote.sun_path, sockpath);
> + len = strlen(remote.sun_path) + sizeof(remote.sun_family);
> + if (connect(s_sock, (struct sockaddr *)&remote, len) == -1) {
> + ODP_ERR("cannot connect to server: %s\n", strerror(errno));
> + close(s_sock);
> + return(-1);
> + }
> +
> + return s_sock;
> +}
> +
> +/*
> + * Client function:
> + * Register a file descriptor to the server. Return -1 on error.
> + */
> +int _odp_fdserver_register_fd(fd_server_context_e context, uint64_t key,
> + int fd_to_send)
> +{
> + int s_sock; /* server socket */
> + int res;
> + int command;
> + int fd;
> +
> + odp_spinlock_lock(client_lock);
> +
> + ODP_DBG("FD client register: pid=%d key=%" PRIu64 ", fd=%d\n",
> + getpid(), key, fd_to_send);
> +
> + s_sock = get_socket();
> + if (s_sock < 0) {
> + odp_spinlock_unlock(client_lock);
> + return(-1);
> + }
> +
> + res = send_fdserver_msg(s_sock, FD_REGISTER_REQ, context, key,
> + fd_to_send);
> + if (res < 0) {
> + ODP_ERR("fd registration failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + res = recv_fdserver_msg(s_sock, &command, &context, &key, &fd);
> +
> + if ((res < 0) || (command != FD_REGISTER_ACK)) {
> + ODP_ERR("fd registration failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + close(s_sock);
> +
> + odp_spinlock_unlock(client_lock);
> + return 0;
> +}
> +
> +/*
> + * Client function:
> + * Deregister a file descriptor from the server. Return -1 on error.
> + */
> +int _odp_fdserver_deregister_fd(fd_server_context_e context, uint64_t
> key)
> +{
> + int s_sock; /* server socket */
> + int res;
> + int command;
> + int fd;
> +
> + odp_spinlock_lock(client_lock);
> +
> + ODP_DBG("FD client deregister: pid=%d key=%" PRIu64 "\n",
> + getpid(), key);
> +
> + s_sock = get_socket();
> + if (s_sock < 0) {
> + odp_spinlock_unlock(client_lock);
> + return(-1);
> + }
> +
> + res = send_fdserver_msg(s_sock, FD_DEREGISTER_REQ, context, key,
> -1);
> + if (res < 0) {
> + ODP_ERR("fd de-registration failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + res = recv_fdserver_msg(s_sock, &command, &context, &key, &fd);
> +
> + if ((res < 0) || (command != FD_DEREGISTER_ACK)) {
> + ODP_ERR("fd de-registration failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + close(s_sock);
> +
> + odp_spinlock_unlock(client_lock);
> + return 0;
> +}
> +
> +/*
> + * client function:
> + * lookup a file descriptor from the server. return -1 on error,
> + * or the file descriptor on success (>=0).
> + */
> +int _odp_fdserver_lookup_fd(fd_server_context_e context, uint64_t key)
> +{
> + int s_sock; /* server socket */
> + int res;
> + int command;
> + int fd;
> +
> + odp_spinlock_lock(client_lock);
> +
> + s_sock = get_socket();
> + if (s_sock < 0) {
> + odp_spinlock_unlock(client_lock);
> + return(-1);
> + }
> +
> + res = send_fdserver_msg(s_sock, FD_LOOKUP_REQ, context, key, -1);
> + if (res < 0) {
> + ODP_ERR("fd lookup failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + res = recv_fdserver_msg(s_sock, &command, &context, &key, &fd);
> +
> + if ((res < 0) || (command != FD_LOOKUP_ACK)) {
> + ODP_ERR("fd lookup failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + close(s_sock);
> + ODP_DBG("FD client lookup: pid=%d, key=%" PRIu64 ", fd=%d\n",
> + getpid(), key, fd);
> +
> + odp_spinlock_unlock(client_lock);
> + return fd;
> +}
> +
> +/*
> + * request server terminaison:
> + */
> +static int stop_server(void)
> +{
> + int s_sock; /* server socket */
> + int res;
> +
> + odp_spinlock_lock(client_lock);
> +
> + ODP_DBG("FD sending server stop request\n");
> +
> + s_sock = get_socket();
> + if (s_sock < 0) {
> + odp_spinlock_unlock(client_lock);
> + return(-1);
> + }
> +
> + res = send_fdserver_msg(s_sock, FD_SERVERSTOP_REQ, 0, 0, -1);
> + if (res < 0) {
> + ODP_ERR("fd stop request failure\n");
> + close(s_sock);
> + odp_spinlock_unlock(client_lock);
> + return -1;
> + }
> +
> + close(s_sock);
> +
> + odp_spinlock_unlock(client_lock);
> + return 0;
> +}
> +
> +/*
> + * server function
> + * receive a client request and handle it.
> + * Always returns 0 unless a stop request is received.
> + */
> +static int handle_request(int client_sock)
> +{
> + int command;
> + fd_server_context_e context;
> + uint64_t key;
> + int fd;
> + int i;
> +
> + /* get a client request: */
> + recv_fdserver_msg(client_sock, &command, &context, &key, &fd);
> + switch (command) {
> + case FD_REGISTER_REQ:
> + if ((fd < 0) || (context >= FD_SRV_CTX_END)) {
> + ODP_ERR("Invalid register fd or context\n");
> + send_fdserver_msg(client_sock, FD_REGISTER_NACK,
> + FD_SRV_CTX_NA, 0, -1);
> + return 0;
> + }
> +
> + /* store the file descriptor in table: */
> + if (fd_table_nb_entries < FDSERVER_MAX_ENTRIES) {
> + fd_table[fd_table_nb_entries].context = context;
> + fd_table[fd_table_nb_entries].key = key;
> + fd_table[fd_table_nb_entries++].fd = fd;
> + ODP_DBG("storing {ctx=%d, key=%" PRIu64
> "}->fd=%d\n",
> + context, key, fd);
> + } else {
> + ODP_ERR("FD table full\n");
> + send_fdserver_msg(client_sock, FD_REGISTER_NACK,
> + FD_SRV_CTX_NA, 0, -1);
> + return 0;
> + }
> +
> + send_fdserver_msg(client_sock, FD_REGISTER_ACK,
> + FD_SRV_CTX_NA, 0, -1);
> + break;
> +
> + case FD_LOOKUP_REQ:
> + if (context >= FD_SRV_CTX_END) {
> + ODP_ERR("invalid lookup context\n");
> + send_fdserver_msg(client_sock, FD_LOOKUP_NACK,
> + FD_SRV_CTX_NA, 0, -1);
> + return 0;
> + }
> +
> + /* search key in table and sent reply: */
> + for (i = 0; i < fd_table_nb_entries; i++) {
> + if ((fd_table[i].context == context) &&
> + (fd_table[i].key == key)) {
> + fd = fd_table[i].fd;
> + ODP_DBG("lookup {ctx=%d,"
> + " key=%" PRIu64 "}->fd=%d\n",
> + context, key, fd);
> + send_fdserver_msg(client_sock,
> + FD_LOOKUP_ACK, context,
> key,
> + fd);
> + return 0;
> + }
> + }
> +
> + /* context+key not found... send nack */
> + send_fdserver_msg(client_sock, FD_LOOKUP_NACK, context,
> key,
> + -1);
> + break;
> +
> + case FD_DEREGISTER_REQ:
> + if (context >= FD_SRV_CTX_END) {
> + ODP_ERR("invalid deregister context\n");
> + send_fdserver_msg(client_sock, FD_DEREGISTER_NACK,
> + FD_SRV_CTX_NA, 0, -1);
> + return 0;
> + }
> +
> + /* search key in table and remove it if found, and reply:
> */
> + for (i = 0; i < fd_table_nb_entries; i++) {
> + if ((fd_table[i].context == context) &&
> + (fd_table[i].key == key)) {
> + ODP_DBG("drop {ctx=%d,"
> + " key=%" PRIu64 "}->fd=%d\n",
> + context, key, fd_table[i].fd);
> + close(fd_table[i].fd);
> + fd_table[i] = fd_table[--fd_table_nb_
> entries];
> + send_fdserver_msg(client_sock,
> + FD_DEREGISTER_ACK,
> + context, key, -1);
> + return 0;
> + }
> + }
> +
> + /* key not found... send nack */
> + send_fdserver_msg(client_sock, FD_DEREGISTER_NACK,
> + context, key, -1);
> + break;
> +
> + case FD_SERVERSTOP_REQ:
> + ODP_DBG("Stoping FD server\n");
> + return 1;
> +
> + default:
> + ODP_ERR("Unexpected request\n");
> + break;
> + }
> + return 0;
> +}
> +
> +/*
> + * server function
> + * loop forever, handling client requests one by one
> + */
> +static void wait_requests(int sock)
> +{
> + int c_socket; /* client connection */
> + unsigned int addr_sz;
> + struct sockaddr_un remote;
> +
> + for (;;) {
> + addr_sz = sizeof(remote);
> + c_socket = accept(sock, (struct sockaddr *)&remote,
> &addr_sz);
> + if (c_socket == -1) {
> + ODP_ERR("wait_requests: %s\n",
> strerror(errno));
> + return;
> + }
> +
> + if (handle_request(c_socket))
> + break;
> + close(c_socket);
> + }
> + close(c_socket);
> +}
> +
> +/*
> + * Create a unix domain socket and fork a process to listen to incoming
> + * requests.
> + */
> +int _odp_fdserver_init_global(void)
> +{
> + char sockpath[FDSERVER_SOCKPATH_MAXLEN];
> + int sock;
> + struct sockaddr_un local;
> + pid_t server_pid;
> + int res;
> +
> + /* create the client spinlock that any client can see: */
> + client_lock = mmap(NULL, sizeof(odp_spinlock_t), PROT_READ |
> PROT_WRITE,
> + MAP_SHARED | MAP_ANONYMOUS, -1, 0);
> +
> + odp_spinlock_init(client_lock);
> +
> + /* construct the server named socket path: */
> + snprintf(sockpath, FDSERVER_SOCKPATH_MAXLEN,
> FDSERVER_SOCKPATH_FORMAT,
> + odp_global_data.main_pid);
> +
> + /* create UNIX domain socket: */
> + sock = socket(AF_UNIX, SOCK_STREAM, 0);
> + if (sock == -1) {
> + ODP_ERR("_odp_fdserver_init_global: %s\n",
> strerror(errno));
> + return(-1);
> + }
> +
> + /* remove previous named socket if it already exists: */
> + unlink(sockpath);
> +
> + /* bind to new named socket: */
> + local.sun_family = AF_UNIX;
> + strncpy(local.sun_path, sockpath, sizeof(local.sun_path));
> + res = bind(sock, (struct sockaddr *)&local, sizeof(struct
> sockaddr_un));
> + if (res == -1) {
> + ODP_ERR("_odp_fdserver_init_global: %s\n",
> strerror(errno));
> + close(sock);
> + return(-1);
> + }
> +
> + /* listen for incoming conections: */
> + if (listen(sock, FDSERVER_BACKLOG) == -1) {
> + ODP_ERR("_odp_fdserver_init_global: %s\n",
> strerror(errno));
> + close(sock);
> + return(-1);
> + }
> +
> + /* fork a server process: */
> + server_pid = fork();
> + if (server_pid == -1) {
> + ODP_ERR("Could not fork!\n");
> + close(sock);
> + return(-1);
> + }
> +
> + if (server_pid == 0) { /*child */
> + /* TODO: pin the server on appropriate service cpu mask */
> + /* when (if) we can agree on the usage of service mask */
> +
> + wait_requests(sock); /* Returns when server is stopped */
> + close(sock);
> + exit(0);
> + }
> +
> + /* parent */
> + close(sock);
> + return 0;
> +}
> +
> +/*
> + * Terminate the server
> + */
> +int _odp_fdserver_term_global(void)
> +{
> + int status;
> + char sockpath[FDSERVER_SOCKPATH_MAXLEN];
> +
> + /* close the server and wait for child terminaison*/
> + stop_server();
> + wait(&status);
> +
> + /* construct the server named socket path: */
> + snprintf(sockpath, FDSERVER_SOCKPATH_MAXLEN,
> FDSERVER_SOCKPATH_FORMAT,
> + odp_global_data.main_pid);
> +
> + /* delete the UNIX domain socket: */
> + unlink(sockpath);
> +
> + return 0;
> +}
> diff --git a/platform/linux-generic/include/_fdserver_internal.h
> b/platform/linux-generic/include/_fdserver_internal.h
> new file mode 100644
> index 0000000..480ac02
> --- /dev/null
> +++ b/platform/linux-generic/include/_fdserver_internal.h
> @@ -0,0 +1,38 @@
> +/* Copyright (c) 2016, Linaro Limited
> + * All rights reserved.
> + *
> + * SPDX-License-Identifier: BSD-3-Clause
> + */
> +
> +#ifndef _FD_SERVER_INTERNAL_H
> +#define _FD_SERVER_INTERNAL_H
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/*
> + * the following enum defines the different contextes by which the
> + * FD server may be used: In the FD server, the keys used to
> store/retrieve
> + * a file descriptor are actually context based:
> + * Both the context and the key are stored at fd registration time,
> + * and both the context and the key are used to retrieve a fd.
> + * In other words a context identifies a FD server usage, so that
> different
> + * unrelated fd server users do not have to guarantee key unicity between
> + * them.
> + */
> +typedef enum fd_server_context {
> + FD_SRV_CTX_NA, /* Not Applicable */
> + FD_SRV_CTX_END, /* upper enum limit */
> +} fd_server_context_e;
> +
> +int _odp_fdserver_register_fd(fd_server_context_e context, uint64_t key,
> + int fd);
> +int _odp_fdserver_deregister_fd(fd_server_context_e context, uint64_t
> key);
> +int _odp_fdserver_lookup_fd(fd_server_context_e context, uint64_t key);
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/platform/linux-generic/include/odp_internal.h
> b/platform/linux-generic/include/odp_internal.h
> index 8bad450..fd770b5 100644
> --- a/platform/linux-generic/include/odp_internal.h
> +++ b/platform/linux-generic/include/odp_internal.h
> @@ -54,6 +54,7 @@ enum init_stage {
> CPUMASK_INIT,
> TIME_INIT,
> SYSINFO_INIT,
> + FDSERVER_INIT,
> SHM_INIT,
> THREAD_INIT,
> POOL_INIT,
> @@ -119,6 +120,9 @@ int odp_tm_term_global(void);
> int _odp_int_name_tbl_init_global(void);
> int _odp_int_name_tbl_term_global(void);
>
> +int _odp_fdserver_init_global(void);
> +int _odp_fdserver_term_global(void);
> +
> int cpuinfo_parser(FILE *file, system_info_t *sysinfo);
> uint64_t odp_cpu_hz_current(int id);
>
> diff --git a/platform/linux-generic/odp_init.c
> b/platform/linux-generic/odp_init.c
> index f534759..ec84fd0 100644
> --- a/platform/linux-generic/odp_init.c
> +++ b/platform/linux-generic/odp_init.c
> @@ -51,6 +51,12 @@ int odp_init_global(odp_instance_t *instance,
> }
> stage = SYSINFO_INIT;
>
> + if (_odp_fdserver_init_global()) {
> + ODP_ERR("ODP fdserver init failed.\n");
> + goto init_failed;
> + }
> + stage = FDSERVER_INIT;
> +
> if (odp_shm_init_global()) {
> ODP_ERR("ODP shm init failed.\n");
> goto init_failed;
> @@ -218,6 +224,13 @@ int _odp_term_global(enum init_stage stage)
> }
> /* Fall through */
>
> + case FDSERVER_INIT:
> + if (_odp_fdserver_term_global()) {
> + ODP_ERR("ODP fdserver term failed.\n");
> + rc = -1;
> + }
> + /* Fall through */
> +
> case SYSINFO_INIT:
> if (odp_system_info_term()) {
> ODP_ERR("ODP system info term failed.\n");
> --
> 2.7.4
>
>
