From 719978035732a55261b753bbc33570d3c1f53785 Mon Sep 17 00:00:00 2001 From: Jakob Odersky Date: Thu, 27 Jun 2013 19:27:57 +0200 Subject: refactor build to a more generic structure --- flow-native/unix/src/flow.c | 295 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 295 insertions(+) create mode 100644 flow-native/unix/src/flow.c (limited to 'flow-native/unix') diff --git a/flow-native/unix/src/flow.c b/flow-native/unix/src/flow.c new file mode 100644 index 0000000..174e9c0 --- /dev/null +++ b/flow-native/unix/src/flow.c @@ -0,0 +1,295 @@ +/* + * Copyright (C) 2013 Jakob Odersky + * + * 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 the 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. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include "com_github_jodersky_flow_internal_NativeSerial.h" +#include "flow.h" + +static bool debug = false; +#define DEBUG(f) if (debug) {f} + +void serial_debug(bool value) { + debug = value; +} + +int serial_open(const char* port_name, int baud, struct serial_config** serial) { + + int fd = open(port_name, O_RDWR | O_NOCTTY | O_NONBLOCK); + + if (fd < 0) { + int en = errno; + DEBUG(perror("obtain file descriptor");); + if (en == EACCES) return E_ACCESS_DENIED; + if (en == ENOENT) return E_NO_PORT; + return E_IO; + } + + if (flock(fd, LOCK_EX | LOCK_NB) < 0) { + DEBUG(perror("acquire lock on port");); + close(fd); + return E_BUSY; + } + + speed_t bd; + switch (baud) { + case 50: bd = B50; break; + case 75: bd = B75; break; + case 110: bd = B110; break; + case 134: bd = B134; break; + case 150: bd = B150; break; + case 200: bd = B200; break; + case 300: bd = B300; break; + case 600: bd = B600; break; + case 1200: bd = B1200; break; + case 1800: bd = B1800; break; + case 2400: bd = B2400; break; + case 4800: bd = B4800; break; + case 9600: bd = B9600; break; + case 19200: bd = B19200; break; + case 38400: bd = B38400; break; + case 57600: bd = B57600; break; + case 115200: bd = B115200; break; + case 230400: bd = B230400; break; + default: + close(fd); + return E_INVALID_BAUD; + break; + } + + /* configure new port settings */ + struct termios newtio; + newtio.c_cflag &= ~(PARENB | CSTOPB | CSIZE | CRTSCTS); // 8N1 + newtio.c_cflag |= CS8 | CREAD | CLOCAL; + newtio.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl + newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw + newtio.c_oflag &= ~OPOST; // make raw + + //see: http://unixwiz.net/techtips/termios-vmin-vtime.html + //newtio.c_cc[VMIN] = 1; + //newtio.c_cc[VTIME] = 2*10/baud; + + if (cfsetspeed(&newtio, bd) < 0) { + DEBUG(perror("set baud rate");); + close(fd); + return E_IO; + } + + /* load new settings to port */ + if (tcflush(fd, TCIOFLUSH) < 0) { + DEBUG(perror("flush serial settings");); + close(fd); + return E_IO; + } + + if (tcsetattr(fd, TCSANOW, &newtio) < 0) { + DEBUG(perror("apply serial settings");); + close(fd); + return E_IO; + } + + int pipe_fd[2]; + if (pipe2(pipe_fd, O_NONBLOCK) < 0) { + DEBUG(perror("open pipe");); + close(fd); + return E_IO; + } + + struct serial_config* s = malloc(sizeof(s)); + if (s == NULL) { + DEBUG(perror("allocate memory for serial configuration");); + close(fd); + close(pipe_fd[0]); + close(pipe_fd[1]); + return E_IO; + } + + s->port_fd = fd; + s->pipe_read_fd = pipe_fd[0]; + s->pipe_write_fd = pipe_fd[1]; + (*serial) = s; + + return 0; +} + +int serial_close(struct serial_config* serial) { + if (close(serial->pipe_write_fd) < 0) { + DEBUG(perror("close write end of pipe");); + return E_IO; + } + if (close(serial->pipe_read_fd) < 0) { + DEBUG(perror("close read end of pipe");); + return E_IO; + } + + if (flock(serial->port_fd, LOCK_UN) < 0){ + DEBUG(perror("release lock on port");); + return E_IO; + } + if (close(serial->port_fd) < 0) { + DEBUG(perror("close port");); + return E_IO; + } + + free(serial); + return 0; +} + +int serial_read(struct serial_config* serial, unsigned char* buffer, size_t size) { + + struct pollfd polls[2]; + polls[0].fd = serial->port_fd; // serial poll + polls[0].events = POLLIN; + + polls[1].fd = serial->pipe_read_fd; // pipe poll + polls[1].events = POLLIN; + + int n = poll(polls,2,-1); + if (n < 0) { + DEBUG(perror("poll");); + return E_IO; + } + + if ((polls[0].revents & POLLIN) != 0) { + int r = read(polls[0].fd, buffer, size); + + //treat 0 bytes read as an error to avoid problems on disconnect + //anyway, after a poll there should be more than 0 bytes available to read + if (r <= 0) { + DEBUG(perror("read");); + return E_IO; + } + return r; + } else if ((polls[1].revents & POLLIN) != 0) { + return E_INTERRUPT; + } else { + fputs("poll revents: unknown revents\n", stderr); + return E_IO; + } +} + +int serial_write(struct serial_config* serial, unsigned char* data, size_t size) { + int r = write(serial->port_fd, data, size); + if (r < 0) { + DEBUG(perror("write");); + return E_IO; + } + return r; +} + +int serial_interrupt(struct serial_config* serial) { + int data = 0xffffffff; + + //write to pipe to wake up any blocked read thread (self-pipe trick) + if (write(serial->pipe_write_fd, &data, 1) < 0) { + DEBUG(perror("write to pipe for interrupt");); + return E_IO; + } + + return 0; +} + + +// JNI bindings +// ============ + +inline struct serial_config* j2s(jlong pointer) { + return (struct serial_config*) pointer; +} + +inline jlong s2j(struct serial_config* pointer) { + return (jlong) pointer; +} + +JNIEXPORT jint JNICALL Java_com_github_jodersky_flow_internal_NativeSerial_open + (JNIEnv *env, jclass clazz, jstring port_name, jint baud, jlongArray jserialp) +{ + const char *dev = (*env)->GetStringUTFChars(env, port_name, 0); + struct serial_config* serial; + int r = serial_open(dev, baud, &serial); + (*env)->ReleaseStringUTFChars(env, port_name, dev); + + long serialp = s2j(serial); + (*env)->SetLongArrayRegion(env, jserialp, 0, 1, &serialp); + + return r; +} + +JNIEXPORT jint JNICALL Java_com_github_jodersky_flow_internal_NativeSerial_close + (JNIEnv * env, jclass clazz, jlong serial) +{ + serial_close(j2s(serial)); +} + +JNIEXPORT jint JNICALL Java_com_github_jodersky_flow_internal_NativeSerial_read + (JNIEnv * env, jclass clazz, jlong serial, jbyteArray jbuffer) +{ + + jsize size = (*env)->GetArrayLength(env, jbuffer); + + unsigned char buffer[size]; + int n = serial_read(j2s(serial), buffer, size); + if (n < 0) { + return n; + } + + (*env)->SetByteArrayRegion(env, jbuffer, 0, n, (signed char *) buffer); + return n; +} + +JNIEXPORT jint JNICALL Java_com_github_jodersky_flow_internal_NativeSerial_write + (JNIEnv * env, jclass clazz, jlong serial, jbyteArray jbuffer) +{ + unsigned char * buffer = (*env)->GetByteArrayElements(env, jbuffer, NULL); + int size = (*env)->GetArrayLength(env, jbuffer); + int r = serial_write(j2s(serial), buffer, size); + + (*env)->ReleaseByteArrayElements(env, jbuffer, buffer, JNI_ABORT); + + return r; +} + +JNIEXPORT jint JNICALL Java_com_github_jodersky_flow_internal_NativeSerial_interrupt + (JNIEnv * env, jclass clazz, jlong serial) +{ + return serial_interrupt(j2s(serial)); +} + +JNIEXPORT void JNICALL Java_com_github_jodersky_flow_internal_NativeSerial_debug + (JNIEnv *env, jclass clazz, jboolean value) +{ + serial_debug((bool) value); +} -- cgit v1.2.3