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preload.c
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/*
* Copyright (c) 2011-2012 Intel Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#define _GNU_SOURCE
#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/sendfile.h>
#include <stdarg.h>
#include <dlfcn.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <semaphore.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/uio.h>
#include <rdma/rdma_cma.h>
#include <rdma/rdma_verbs.h>
#include <rdma/rsocket.h>
#include "cma.h"
#include "indexer.h"
struct socket_calls {
int (*socket)(int domain, int type, int protocol);
int (*bind)(int socket, const struct sockaddr *addr, socklen_t addrlen);
int (*listen)(int socket, int backlog);
int (*accept)(int socket, struct sockaddr *addr, socklen_t *addrlen);
int (*connect)(int socket, const struct sockaddr *addr, socklen_t addrlen);
ssize_t (*recv)(int socket, void *buf, size_t len, int flags);
ssize_t (*recvfrom)(int socket, void *buf, size_t len, int flags,
struct sockaddr *src_addr, socklen_t *addrlen);
ssize_t (*recvmsg)(int socket, struct msghdr *msg, int flags);
ssize_t (*read)(int socket, void *buf, size_t count);
ssize_t (*readv)(int socket, const struct iovec *iov, int iovcnt);
ssize_t (*send)(int socket, const void *buf, size_t len, int flags);
ssize_t (*sendto)(int socket, const void *buf, size_t len, int flags,
const struct sockaddr *dest_addr, socklen_t addrlen);
ssize_t (*sendmsg)(int socket, const struct msghdr *msg, int flags);
ssize_t (*write)(int socket, const void *buf, size_t count);
ssize_t (*writev)(int socket, const struct iovec *iov, int iovcnt);
int (*poll)(struct pollfd *fds, nfds_t nfds, int timeout);
int (*shutdown)(int socket, int how);
int (*close)(int socket);
int (*getpeername)(int socket, struct sockaddr *addr, socklen_t *addrlen);
int (*getsockname)(int socket, struct sockaddr *addr, socklen_t *addrlen);
int (*setsockopt)(int socket, int level, int optname,
const void *optval, socklen_t optlen);
int (*getsockopt)(int socket, int level, int optname,
void *optval, socklen_t *optlen);
int (*fcntl)(int socket, int cmd, ... /* arg */);
int (*dup2)(int oldfd, int newfd);
ssize_t (*sendfile)(int out_fd, int in_fd, off_t *offset, size_t count);
int (*fxstat)(int ver, int fd, struct stat *buf);
};
static struct socket_calls real;
static struct socket_calls rs;
static struct index_map idm;
static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
static int sq_size;
static int rq_size;
static int sq_inline;
static int fork_support;
enum fd_type {
fd_normal,
fd_rsocket
};
enum fd_fork_state {
fd_ready,
fd_fork,
fd_fork_listen,
fd_fork_active,
fd_fork_passive
};
struct fd_info {
enum fd_type type;
enum fd_fork_state state;
int fd;
int dupfd;
_Atomic(int) refcnt;
};
struct config_entry {
char *name;
int domain;
int type;
int protocol;
};
static struct config_entry *config;
static int config_cnt;
static void free_config(void)
{
while (config_cnt)
free(config[--config_cnt].name);
free(config);
}
/*
* Config file format:
* # Starting '#' indicates comment
* # wild card values are supported using '*'
* # domain - *, INET, INET6, IB
* # type - *, STREAM, DGRAM
* # protocol - *, TCP, UDP
* program_name domain type protocol
*/
static void scan_config(void)
{
struct config_entry *new_config;
FILE *fp;
char line[120], prog[64], dom[16], type[16], proto[16];
fp = fopen(RS_CONF_DIR "/preload_config", "r");
if (!fp)
return;
while (fgets(line, sizeof(line), fp)) {
if (line[0] == '#')
continue;
if (sscanf(line, "%63s%15s%15s%15s", prog, dom, type, proto) != 4)
continue;
new_config = realloc(config, (config_cnt + 1) *
sizeof(struct config_entry));
if (!new_config)
break;
config = new_config;
memset(&config[config_cnt], 0, sizeof(struct config_entry));
if (!strcasecmp(dom, "INET") ||
!strcasecmp(dom, "AF_INET") ||
!strcasecmp(dom, "PF_INET")) {
config[config_cnt].domain = AF_INET;
} else if (!strcasecmp(dom, "INET6") ||
!strcasecmp(dom, "AF_INET6") ||
!strcasecmp(dom, "PF_INET6")) {
config[config_cnt].domain = AF_INET6;
} else if (!strcasecmp(dom, "IB") ||
!strcasecmp(dom, "AF_IB") ||
!strcasecmp(dom, "PF_IB")) {
config[config_cnt].domain = AF_IB;
} else if (strcmp(dom, "*")) {
continue;
}
if (!strcasecmp(type, "STREAM") ||
!strcasecmp(type, "SOCK_STREAM")) {
config[config_cnt].type = SOCK_STREAM;
} else if (!strcasecmp(type, "DGRAM") ||
!strcasecmp(type, "SOCK_DGRAM")) {
config[config_cnt].type = SOCK_DGRAM;
} else if (strcmp(type, "*")) {
continue;
}
if (!strcasecmp(proto, "TCP") ||
!strcasecmp(proto, "IPPROTO_TCP")) {
config[config_cnt].protocol = IPPROTO_TCP;
} else if (!strcasecmp(proto, "UDP") ||
!strcasecmp(proto, "IPPROTO_UDP")) {
config[config_cnt].protocol = IPPROTO_UDP;
} else if (strcmp(proto, "*")) {
continue;
}
if (strcmp(prog, "*")) {
if (!(config[config_cnt].name = strdup(prog)))
continue;
}
config_cnt++;
}
fclose(fp);
if (config_cnt)
atexit(free_config);
}
static int intercept_socket(int domain, int type, int protocol)
{
int i;
if (!config_cnt)
return 1;
if (!protocol) {
if (type == SOCK_STREAM)
protocol = IPPROTO_TCP;
else if (type == SOCK_DGRAM)
protocol = IPPROTO_UDP;
}
for (i = 0; i < config_cnt; i++) {
if ((!config[i].name ||
!strncasecmp(config[i].name, program_invocation_short_name,
strlen(config[i].name))) &&
(!config[i].domain || config[i].domain == domain) &&
(!config[i].type || config[i].type == type) &&
(!config[i].protocol || config[i].protocol == protocol))
return 1;
}
return 0;
}
static int fd_open(void)
{
struct fd_info *fdi;
int ret, index;
fdi = calloc(1, sizeof(*fdi));
if (!fdi)
return ERR(ENOMEM);
index = open("/dev/null", O_RDONLY);
if (index < 0) {
ret = index;
goto err1;
}
fdi->dupfd = -1;
atomic_store(&fdi->refcnt, 1);
pthread_mutex_lock(&mut);
ret = idm_set(&idm, index, fdi);
pthread_mutex_unlock(&mut);
if (ret < 0)
goto err2;
return index;
err2:
real.close(index);
err1:
free(fdi);
return ret;
}
static void fd_store(int index, int fd, enum fd_type type, enum fd_fork_state state)
{
struct fd_info *fdi;
fdi = idm_at(&idm, index);
fdi->fd = fd;
fdi->type = type;
fdi->state = state;
}
static inline enum fd_type fd_get(int index, int *fd)
{
struct fd_info *fdi;
fdi = idm_lookup(&idm, index);
if (fdi) {
*fd = fdi->fd;
return fdi->type;
} else {
*fd = index;
return fd_normal;
}
}
static inline int fd_getd(int index)
{
struct fd_info *fdi;
fdi = idm_lookup(&idm, index);
return fdi ? fdi->fd : index;
}
static inline enum fd_fork_state fd_gets(int index)
{
struct fd_info *fdi;
fdi = idm_lookup(&idm, index);
return fdi ? fdi->state : fd_ready;
}
static inline enum fd_type fd_gett(int index)
{
struct fd_info *fdi;
fdi = idm_lookup(&idm, index);
return fdi ? fdi->type : fd_normal;
}
static enum fd_type fd_close(int index, int *fd)
{
struct fd_info *fdi;
enum fd_type type;
fdi = idm_lookup(&idm, index);
if (fdi) {
idm_clear(&idm, index);
*fd = fdi->fd;
type = fdi->type;
real.close(index);
free(fdi);
} else {
*fd = index;
type = fd_normal;
}
return type;
}
static void getenv_options(void)
{
char *var;
var = getenv("RS_SQ_SIZE");
if (var)
sq_size = atoi(var);
var = getenv("RS_RQ_SIZE");
if (var)
rq_size = atoi(var);
var = getenv("RS_INLINE");
if (var)
sq_inline = atoi(var);
var = getenv("RDMAV_FORK_SAFE");
if (var)
fork_support = atoi(var);
}
static void init_preload(void)
{
static int init;
/* Quick check without lock */
if (init)
return;
pthread_mutex_lock(&mut);
if (init)
goto out;
real.socket = dlsym(RTLD_NEXT, "socket");
real.bind = dlsym(RTLD_NEXT, "bind");
real.listen = dlsym(RTLD_NEXT, "listen");
real.accept = dlsym(RTLD_NEXT, "accept");
real.connect = dlsym(RTLD_NEXT, "connect");
real.recv = dlsym(RTLD_NEXT, "recv");
real.recvfrom = dlsym(RTLD_NEXT, "recvfrom");
real.recvmsg = dlsym(RTLD_NEXT, "recvmsg");
real.read = dlsym(RTLD_NEXT, "read");
real.readv = dlsym(RTLD_NEXT, "readv");
real.send = dlsym(RTLD_NEXT, "send");
real.sendto = dlsym(RTLD_NEXT, "sendto");
real.sendmsg = dlsym(RTLD_NEXT, "sendmsg");
real.write = dlsym(RTLD_NEXT, "write");
real.writev = dlsym(RTLD_NEXT, "writev");
real.poll = dlsym(RTLD_NEXT, "poll");
real.shutdown = dlsym(RTLD_NEXT, "shutdown");
real.close = dlsym(RTLD_NEXT, "close");
real.getpeername = dlsym(RTLD_NEXT, "getpeername");
real.getsockname = dlsym(RTLD_NEXT, "getsockname");
real.setsockopt = dlsym(RTLD_NEXT, "setsockopt");
real.getsockopt = dlsym(RTLD_NEXT, "getsockopt");
real.fcntl = dlsym(RTLD_NEXT, "fcntl");
real.dup2 = dlsym(RTLD_NEXT, "dup2");
real.sendfile = dlsym(RTLD_NEXT, "sendfile");
real.fxstat = dlsym(RTLD_NEXT, "__fxstat");
rs.socket = dlsym(RTLD_DEFAULT, "rsocket");
rs.bind = dlsym(RTLD_DEFAULT, "rbind");
rs.listen = dlsym(RTLD_DEFAULT, "rlisten");
rs.accept = dlsym(RTLD_DEFAULT, "raccept");
rs.connect = dlsym(RTLD_DEFAULT, "rconnect");
rs.recv = dlsym(RTLD_DEFAULT, "rrecv");
rs.recvfrom = dlsym(RTLD_DEFAULT, "rrecvfrom");
rs.recvmsg = dlsym(RTLD_DEFAULT, "rrecvmsg");
rs.read = dlsym(RTLD_DEFAULT, "rread");
rs.readv = dlsym(RTLD_DEFAULT, "rreadv");
rs.send = dlsym(RTLD_DEFAULT, "rsend");
rs.sendto = dlsym(RTLD_DEFAULT, "rsendto");
rs.sendmsg = dlsym(RTLD_DEFAULT, "rsendmsg");
rs.write = dlsym(RTLD_DEFAULT, "rwrite");
rs.writev = dlsym(RTLD_DEFAULT, "rwritev");
rs.poll = dlsym(RTLD_DEFAULT, "rpoll");
rs.shutdown = dlsym(RTLD_DEFAULT, "rshutdown");
rs.close = dlsym(RTLD_DEFAULT, "rclose");
rs.getpeername = dlsym(RTLD_DEFAULT, "rgetpeername");
rs.getsockname = dlsym(RTLD_DEFAULT, "rgetsockname");
rs.setsockopt = dlsym(RTLD_DEFAULT, "rsetsockopt");
rs.getsockopt = dlsym(RTLD_DEFAULT, "rgetsockopt");
rs.fcntl = dlsym(RTLD_DEFAULT, "rfcntl");
getenv_options();
scan_config();
init = 1;
out:
pthread_mutex_unlock(&mut);
}
/*
* We currently only handle copying a few common values.
*/
static int copysockopts(int dfd, int sfd, struct socket_calls *dapi,
struct socket_calls *sapi)
{
socklen_t len;
int param, ret;
ret = sapi->fcntl(sfd, F_GETFL);
if (ret > 0)
ret = dapi->fcntl(dfd, F_SETFL, ret);
if (ret)
return ret;
len = sizeof param;
ret = sapi->getsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, ¶m, &len);
if (param && !ret)
ret = dapi->setsockopt(dfd, SOL_SOCKET, SO_REUSEADDR, ¶m, len);
if (ret)
return ret;
len = sizeof param;
ret = sapi->getsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, ¶m, &len);
if (param && !ret)
ret = dapi->setsockopt(dfd, IPPROTO_TCP, TCP_NODELAY, ¶m, len);
if (ret)
return ret;
return 0;
}
/*
* Convert between an rsocket and a normal socket.
*/
static int transpose_socket(int socket, enum fd_type new_type)
{
socklen_t len = 0;
int sfd, dfd, param, ret;
struct socket_calls *sapi, *dapi;
sfd = fd_getd(socket);
if (new_type == fd_rsocket) {
dapi = &rs;
sapi = ℜ
} else {
dapi = ℜ
sapi = &rs;
}
ret = sapi->getsockname(sfd, NULL, &len);
if (ret)
return ret;
param = (len == sizeof(struct sockaddr_in6)) ? PF_INET6 : PF_INET;
dfd = dapi->socket(param, SOCK_STREAM, 0);
if (dfd < 0)
return dfd;
ret = copysockopts(dfd, sfd, dapi, sapi);
if (ret)
goto err;
fd_store(socket, dfd, new_type, fd_ready);
return dfd;
err:
dapi->close(dfd);
return ret;
}
/*
* Use defaults on failure.
*/
static void set_rsocket_options(int rsocket)
{
if (sq_size)
rsetsockopt(rsocket, SOL_RDMA, RDMA_SQSIZE, &sq_size, sizeof sq_size);
if (rq_size)
rsetsockopt(rsocket, SOL_RDMA, RDMA_RQSIZE, &rq_size, sizeof rq_size);
if (sq_inline)
rsetsockopt(rsocket, SOL_RDMA, RDMA_INLINE, &sq_inline, sizeof sq_inline);
}
int socket(int domain, int type, int protocol)
{
static __thread int recursive;
int index, ret;
init_preload();
if (recursive || !intercept_socket(domain, type, protocol))
goto real;
index = fd_open();
if (index < 0)
return index;
if (fork_support && (domain == PF_INET || domain == PF_INET6) &&
(type == SOCK_STREAM) && (!protocol || protocol == IPPROTO_TCP)) {
ret = real.socket(domain, type, protocol);
if (ret < 0)
return ret;
fd_store(index, ret, fd_normal, fd_fork);
return index;
}
recursive = 1;
ret = rsocket(domain, type, protocol);
recursive = 0;
if (ret >= 0) {
fd_store(index, ret, fd_rsocket, fd_ready);
set_rsocket_options(ret);
return index;
}
fd_close(index, &ret);
real:
return real.socket(domain, type, protocol);
}
int bind(int socket, const struct sockaddr *addr, socklen_t addrlen)
{
int fd;
return (fd_get(socket, &fd) == fd_rsocket) ?
rbind(fd, addr, addrlen) : real.bind(fd, addr, addrlen);
}
int listen(int socket, int backlog)
{
int fd, ret;
if (fd_get(socket, &fd) == fd_rsocket) {
ret = rlisten(fd, backlog);
} else {
ret = real.listen(fd, backlog);
if (!ret && fd_gets(socket) == fd_fork)
fd_store(socket, fd, fd_normal, fd_fork_listen);
}
return ret;
}
int accept(int socket, struct sockaddr *addr, socklen_t *addrlen)
{
int fd, index, ret;
if (fd_get(socket, &fd) == fd_rsocket) {
index = fd_open();
if (index < 0)
return index;
ret = raccept(fd, addr, addrlen);
if (ret < 0) {
fd_close(index, &fd);
return ret;
}
fd_store(index, ret, fd_rsocket, fd_ready);
return index;
} else if (fd_gets(socket) == fd_fork_listen) {
index = fd_open();
if (index < 0)
return index;
ret = real.accept(fd, addr, addrlen);
if (ret < 0) {
fd_close(index, &fd);
return ret;
}
fd_store(index, ret, fd_normal, fd_fork_passive);
return index;
} else {
return real.accept(fd, addr, addrlen);
}
}
/*
* We can't fork RDMA connections and pass them from the parent to the child
* process. Instead, we need to establish the RDMA connection after calling
* fork. To do this, we delay establishing the RDMA connection until we try
* to send/receive on the server side.
*/
static void fork_active(int socket)
{
struct sockaddr_storage addr;
int sfd, dfd, ret;
socklen_t len;
uint32_t msg;
long flags;
sfd = fd_getd(socket);
flags = real.fcntl(sfd, F_GETFL);
real.fcntl(sfd, F_SETFL, 0);
ret = real.recv(sfd, &msg, sizeof msg, MSG_PEEK);
real.fcntl(sfd, F_SETFL, flags);
if ((ret != sizeof msg) || msg)
goto err1;
len = sizeof addr;
ret = real.getpeername(sfd, (struct sockaddr *) &addr, &len);
if (ret)
goto err1;
dfd = rsocket(addr.ss_family, SOCK_STREAM, 0);
if (dfd < 0)
goto err1;
ret = rconnect(dfd, (struct sockaddr *) &addr, len);
if (ret)
goto err2;
set_rsocket_options(dfd);
copysockopts(dfd, sfd, &rs, &real);
real.shutdown(sfd, SHUT_RDWR);
real.close(sfd);
fd_store(socket, dfd, fd_rsocket, fd_ready);
return;
err2:
rclose(dfd);
err1:
fd_store(socket, sfd, fd_normal, fd_ready);
}
/*
* The server will start listening for the new connection, then send a
* message to the active side when the listen is ready. This does leave
* fork unsupported in the following case: the server is nonblocking and
* calls select/poll waiting to receive data from the client.
*/
static void fork_passive(int socket)
{
struct sockaddr_in6 sin6;
sem_t *sem;
int lfd, sfd, dfd, ret, param;
socklen_t len;
uint32_t msg;
sfd = fd_getd(socket);
len = sizeof sin6;
ret = real.getsockname(sfd, (struct sockaddr *) &sin6, &len);
if (ret)
goto out;
sin6.sin6_flowinfo = 0;
sin6.sin6_scope_id = 0;
memset(&sin6.sin6_addr, 0, sizeof sin6.sin6_addr);
sem = sem_open("/rsocket_fork", O_CREAT | O_RDWR,
S_IRWXU | S_IRWXG, 1);
if (sem == SEM_FAILED) {
ret = -1;
goto out;
}
lfd = rsocket(sin6.sin6_family, SOCK_STREAM, 0);
if (lfd < 0) {
ret = lfd;
goto sclose;
}
param = 1;
rsetsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, ¶m, sizeof param);
sem_wait(sem);
ret = rbind(lfd, (struct sockaddr *) &sin6, sizeof sin6);
if (ret)
goto lclose;
ret = rlisten(lfd, 1);
if (ret)
goto lclose;
msg = 0;
len = real.write(sfd, &msg, sizeof msg);
if (len != sizeof msg)
goto lclose;
dfd = raccept(lfd, NULL, NULL);
if (dfd < 0) {
ret = dfd;
goto lclose;
}
set_rsocket_options(dfd);
copysockopts(dfd, sfd, &rs, &real);
real.shutdown(sfd, SHUT_RDWR);
real.close(sfd);
fd_store(socket, dfd, fd_rsocket, fd_ready);
lclose:
rclose(lfd);
sem_post(sem);
sclose:
sem_close(sem);
out:
if (ret)
fd_store(socket, sfd, fd_normal, fd_ready);
}
static inline enum fd_type fd_fork_get(int index, int *fd)
{
struct fd_info *fdi;
fdi = idm_lookup(&idm, index);
if (fdi) {
if (fdi->state == fd_fork_passive)
fork_passive(index);
else if (fdi->state == fd_fork_active)
fork_active(index);
*fd = fdi->fd;
return fdi->type;
} else {
*fd = index;
return fd_normal;
}
}
int connect(int socket, const struct sockaddr *addr, socklen_t addrlen)
{
int fd, ret;
if (fd_get(socket, &fd) == fd_rsocket) {
ret = rconnect(fd, addr, addrlen);
if (!ret || errno == EINPROGRESS)
return ret;
ret = transpose_socket(socket, fd_normal);
if (ret < 0)
return ret;
rclose(fd);
fd = ret;
} else if (fd_gets(socket) == fd_fork) {
fd_store(socket, fd, fd_normal, fd_fork_active);
}
return real.connect(fd, addr, addrlen);
}
ssize_t recv(int socket, void *buf, size_t len, int flags)
{
int fd;
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rrecv(fd, buf, len, flags) : real.recv(fd, buf, len, flags);
}
ssize_t recvfrom(int socket, void *buf, size_t len, int flags,
struct sockaddr *src_addr, socklen_t *addrlen)
{
int fd;
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rrecvfrom(fd, buf, len, flags, src_addr, addrlen) :
real.recvfrom(fd, buf, len, flags, src_addr, addrlen);
}
ssize_t recvmsg(int socket, struct msghdr *msg, int flags)
{
int fd;
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rrecvmsg(fd, msg, flags) : real.recvmsg(fd, msg, flags);
}
ssize_t read(int socket, void *buf, size_t count)
{
int fd;
init_preload();
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rread(fd, buf, count) : real.read(fd, buf, count);
}
ssize_t readv(int socket, const struct iovec *iov, int iovcnt)
{
int fd;
init_preload();
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rreadv(fd, iov, iovcnt) : real.readv(fd, iov, iovcnt);
}
ssize_t send(int socket, const void *buf, size_t len, int flags)
{
int fd;
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rsend(fd, buf, len, flags) : real.send(fd, buf, len, flags);
}
ssize_t sendto(int socket, const void *buf, size_t len, int flags,
const struct sockaddr *dest_addr, socklen_t addrlen)
{
int fd;
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rsendto(fd, buf, len, flags, dest_addr, addrlen) :
real.sendto(fd, buf, len, flags, dest_addr, addrlen);
}
ssize_t sendmsg(int socket, const struct msghdr *msg, int flags)
{
int fd;
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rsendmsg(fd, msg, flags) : real.sendmsg(fd, msg, flags);
}
ssize_t write(int socket, const void *buf, size_t count)
{
int fd;
init_preload();
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rwrite(fd, buf, count) : real.write(fd, buf, count);
}
ssize_t writev(int socket, const struct iovec *iov, int iovcnt)
{
int fd;
init_preload();
return (fd_fork_get(socket, &fd) == fd_rsocket) ?
rwritev(fd, iov, iovcnt) : real.writev(fd, iov, iovcnt);
}
static struct pollfd *fds_alloc(nfds_t nfds)
{
static __thread struct pollfd *rfds;
static __thread nfds_t rnfds;
if (nfds > rnfds) {
if (rfds)
free(rfds);
rfds = malloc(sizeof(*rfds) * nfds);
rnfds = rfds ? nfds : 0;
}
return rfds;
}
int poll(struct pollfd *fds, nfds_t nfds, int timeout)
{
struct pollfd *rfds;
int i, ret;
init_preload();
for (i = 0; i < nfds; i++) {
if (fd_gett(fds[i].fd) == fd_rsocket)
goto use_rpoll;
}
return real.poll(fds, nfds, timeout);
use_rpoll:
rfds = fds_alloc(nfds);
if (!rfds)
return ERR(ENOMEM);
for (i = 0; i < nfds; i++) {
rfds[i].fd = fd_getd(fds[i].fd);
rfds[i].events = fds[i].events;
rfds[i].revents = 0;
}
ret = rpoll(rfds, nfds, timeout);
for (i = 0; i < nfds; i++)
fds[i].revents = rfds[i].revents;
return ret;
}
static void select_to_rpoll(struct pollfd *fds, int *nfds,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds)
{
int fd, events, i = 0;
for (fd = 0; fd < *nfds; fd++) {
events = (readfds && FD_ISSET(fd, readfds)) ? POLLIN : 0;
if (writefds && FD_ISSET(fd, writefds))
events |= POLLOUT;
if (events || (exceptfds && FD_ISSET(fd, exceptfds))) {
fds[i].fd = fd_getd(fd);
fds[i++].events = events;
}
}
*nfds = i;
}
static int rpoll_to_select(struct pollfd *fds, int nfds,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds)
{
int fd, rfd, i, cnt = 0;
for (i = 0, fd = 0; i < nfds; fd++) {
rfd = fd_getd(fd);
if (rfd != fds[i].fd)
continue;
if (readfds && (fds[i].revents & POLLIN)) {
FD_SET(fd, readfds);
cnt++;
}
if (writefds && (fds[i].revents & POLLOUT)) {
FD_SET(fd, writefds);
cnt++;
}
if (exceptfds && (fds[i].revents & ~(POLLIN | POLLOUT))) {
FD_SET(fd, exceptfds);
cnt++;
}
i++;
}
return cnt;
}
static int rs_convert_timeout(struct timeval *timeout)
{
return !timeout ? -1 : timeout->tv_sec * 1000 + timeout->tv_usec / 1000;
}
int select(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *timeout)
{
struct pollfd *fds;
int ret;
fds = fds_alloc(nfds);
if (!fds)
return ERR(ENOMEM);
select_to_rpoll(fds, &nfds, readfds, writefds, exceptfds);
ret = rpoll(fds, nfds, rs_convert_timeout(timeout));
if (readfds)
FD_ZERO(readfds);
if (writefds)
FD_ZERO(writefds);
if (exceptfds)
FD_ZERO(exceptfds);
if (ret > 0)
ret = rpoll_to_select(fds, nfds, readfds, writefds, exceptfds);
return ret;
}
int shutdown(int socket, int how)
{
int fd;
return (fd_get(socket, &fd) == fd_rsocket) ?
rshutdown(fd, how) : real.shutdown(fd, how);
}