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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* Test grpc_em_fd with pipe. The test creates a pipe with non-blocking mode,
sends a stream of bytes through the pipe, and verifies that all bytes are
received. */
#include "src/core/eventmanager/em.h"
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <grpc/support/log.h>
#include "test/core/util/test_config.h"
/* Operation for fcntl() to set pipe buffer size. */
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (1024 + 7)
#endif
#define TOTAL_WRITE 3 /* total number of times that the write buffer is full. \
*/
#define BUF_SIZE 1024
char read_buf[BUF_SIZE];
char write_buf[BUF_SIZE];
typedef struct {
int fd[2];
grpc_em em;
grpc_em_fd read_em_fd;
grpc_em_fd write_em_fd;
int num_write; /* number of times that the write buffer is full*/
ssize_t bytes_written_total; /* total number of bytes written to the pipe */
ssize_t bytes_read_total; /* total number of bytes read from the pipe */
pthread_mutex_t mu; /* protect cv and done */
pthread_cond_t cv; /* signaled when read finished */
int done; /* set to 1 when read finished */
} async_pipe;
void write_shutdown_cb(void *arg, /*async_pipe*/
enum grpc_em_cb_status status) {
async_pipe *ap = arg;
close(ap->fd[1]);
grpc_em_fd_destroy(&ap->write_em_fd);
}
void write_cb(void *arg, /*async_pipe*/ enum grpc_em_cb_status status) {
async_pipe *ap = arg;
ssize_t bytes_written = 0;
if (status == GRPC_CALLBACK_CANCELLED) {
write_shutdown_cb(arg, GRPC_CALLBACK_SUCCESS);
return;
}
do {
bytes_written = write(ap->fd[1], write_buf, BUF_SIZE);
if (bytes_written > 0) ap->bytes_written_total += bytes_written;
} while (bytes_written > 0);
if (errno == EAGAIN) {
if (ap->num_write < TOTAL_WRITE) {
ap->num_write++;
grpc_em_fd_notify_on_write(&ap->write_em_fd, write_cb, ap,
gpr_inf_future);
} else {
/* Note that this could just shut down directly; doing a trip through the
shutdown path serves only a demonstration of the API. */
grpc_em_fd_shutdown(&ap->write_em_fd);
grpc_em_fd_notify_on_write(&ap->write_em_fd, write_cb, ap,
gpr_inf_future);
}
} else {
GPR_ASSERT(0 && strcat("unknown errno: ", strerror(errno)));
}
}
void read_shutdown_cb(void *arg, /*async_pipe*/ enum grpc_em_cb_status status) {
async_pipe *ap = arg;
close(ap->fd[0]);
grpc_em_fd_destroy(&ap->read_em_fd);
pthread_mutex_lock(&ap->mu);
if (ap->done == 0) {
ap->done = 1;
pthread_cond_signal(&ap->cv);
}
pthread_mutex_unlock(&ap->mu);
}
void read_cb(void *arg, /*async_pipe*/ enum grpc_em_cb_status status) {
async_pipe *ap = arg;
ssize_t bytes_read = 0;
if (status == GRPC_CALLBACK_CANCELLED) {
read_shutdown_cb(arg, GRPC_CALLBACK_SUCCESS);
return;
}
do {
bytes_read = read(ap->fd[0], read_buf, BUF_SIZE);
if (bytes_read > 0) ap->bytes_read_total += bytes_read;
} while (bytes_read > 0);
if (bytes_read == 0) {
/* Note that this could just shut down directly; doing a trip through the
shutdown path serves only a demonstration of the API. */
grpc_em_fd_shutdown(&ap->read_em_fd);
grpc_em_fd_notify_on_read(&ap->read_em_fd, read_cb, ap, gpr_inf_future);
} else if (bytes_read == -1) {
if (errno == EAGAIN) {
grpc_em_fd_notify_on_read(&ap->read_em_fd, read_cb, ap, gpr_inf_future);
} else {
GPR_ASSERT(0 && strcat("unknown errno: ", strerror(errno)));
}
}
}
void dummy_cb(void *arg, /*async_pipe*/ enum grpc_em_cb_status status) {}
void async_pipe_init(async_pipe *ap) {
int i;
ap->num_write = 0;
ap->bytes_written_total = 0;
ap->bytes_read_total = 0;
pthread_mutex_init(&ap->mu, NULL);
pthread_cond_init(&ap->cv, NULL);
ap->done = 0;
GPR_ASSERT(0 == pipe(ap->fd));
for (i = 0; i < 2; i++) {
int flags = fcntl(ap->fd[i], F_GETFL, 0);
GPR_ASSERT(fcntl(ap->fd[i], F_SETFL, flags | O_NONBLOCK) == 0);
GPR_ASSERT(fcntl(ap->fd[i], F_SETPIPE_SZ, 4096) == 4096);
}
grpc_em_init(&ap->em);
grpc_em_fd_init(&ap->read_em_fd, &ap->em, ap->fd[0]);
grpc_em_fd_init(&ap->write_em_fd, &ap->em, ap->fd[1]);
}
static void async_pipe_start(async_pipe *ap) {
grpc_em_fd_notify_on_read(&ap->read_em_fd, read_cb, ap, gpr_inf_future);
grpc_em_fd_notify_on_write(&ap->write_em_fd, write_cb, ap, gpr_inf_future);
}
static void async_pipe_wait_destroy(async_pipe *ap) {
pthread_mutex_lock(&ap->mu);
while (!ap->done) pthread_cond_wait(&ap->cv, &ap->mu);
pthread_mutex_unlock(&ap->mu);
pthread_mutex_destroy(&ap->mu);
pthread_cond_destroy(&ap->cv);
grpc_em_destroy(&ap->em);
}
int main(int argc, char **argv) {
async_pipe ap;
grpc_test_init(argc, argv);
async_pipe_init(&ap);
async_pipe_start(&ap);
async_pipe_wait_destroy(&ap);
GPR_ASSERT(ap.bytes_read_total == ap.bytes_written_total);
gpr_log(GPR_INFO, "read total bytes %d", ap.bytes_read_total);
return 0;
}
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