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serialport_unix.cpp
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serialport_unix.cpp
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#include "serialport_unix.h"
#include "serialport.h"
#include <sys/file.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#ifdef __APPLE__
#include <AvailabilityMacros.h>
#include <sys/param.h>
#endif
#if defined(MAC_OS_X_VERSION_10_4) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4)
#include <sys/ioctl.h>
#include <IOKit/serial/ioss.h>
#elif defined(__OpenBSD__)
#include <sys/ioctl.h>
#elif defined(__linux__)
#include <sys/ioctl.h>
#include <linux/serial.h>
#include "serialport_linux.h"
#endif
int ToStopBitsConstant(SerialPortStopBits stopBits);
int ToBaudConstant(int baudRate) {
switch (baudRate) {
case 0: return B0;
case 50: return B50;
case 75: return B75;
case 110: return B110;
case 134: return B134;
case 150: return B150;
case 200: return B200;
case 300: return B300;
case 600: return B600;
case 1200: return B1200;
case 1800: return B1800;
case 2400: return B2400;
case 4800: return B4800;
case 9600: return B9600;
case 19200: return B19200;
case 38400: return B38400;
case 57600: return B57600;
case 115200: return B115200;
case 230400: return B230400;
#if defined(__linux__)
case 460800: return B460800;
case 500000: return B500000;
case 576000: return B576000;
case 921600: return B921600;
case 1000000: return B1000000;
case 1152000: return B1152000;
case 1500000: return B1500000;
case 2000000: return B2000000;
case 2500000: return B2500000;
case 3000000: return B3000000;
case 3500000: return B3500000;
case 4000000: return B4000000;
#endif
}
return -1;
}
int ToDataBitsConstant(int dataBits) {
switch (dataBits) {
case 8: default: return CS8;
case 7: return CS7;
case 6: return CS6;
case 5: return CS5;
}
return -1;
}
void EIO_Open(uv_work_t* req) {
OpenBaton* data = static_cast<OpenBaton*>(req->data);
int flags = (O_RDWR | O_NOCTTY | O_NONBLOCK | O_CLOEXEC | O_SYNC);
int fd = open(data->path, flags);
if (-1 == fd) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot open %s", strerror(errno), data->path);
return;
}
if (-1 == setup(fd, data)) {
close(fd);
return;
}
data->result = fd;
}
int setBaudRate(ConnectionOptions *data) {
// lookup the standard baudrates from the table
int baudRate = ToBaudConstant(data->baudRate);
int fd = data->fd;
// get port options
struct termios options;
if (-1 == tcgetattr(fd, &options)) {
snprintf(data->errorString, sizeof(data->errorString),
"Error: %s setting custom baud rate of %d", strerror(errno), data->baudRate);
return -1;
}
// If there is a custom baud rate on linux you can do the following trick with B38400
#if defined(__linux__) && defined(ASYNC_SPD_CUST)
if (baudRate == -1) {
int err = linuxSetCustomBaudRate(fd, data->baudRate);
if (err == -1) {
snprintf(data->errorString, sizeof(data->errorString),
"Error: %s || while retrieving termios2 info", strerror(errno));
return -1;
} else if (err == -2) {
snprintf(data->errorString, sizeof(data->errorString),
"Error: %s || while setting custom baud rate of %d", strerror(errno), data->baudRate);
return -1;
}
return 1;
}
#endif
// On OS X, starting with Tiger, we can set a custom baud rate with ioctl
#if defined(MAC_OS_X_VERSION_10_4) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4)
if (-1 == baudRate) {
speed_t speed = data->baudRate;
if (-1 == ioctl(fd, IOSSIOSPEED, &speed)) {
snprintf(data->errorString, sizeof(data->errorString),
"Error: %s calling ioctl(.., IOSSIOSPEED, %ld )", strerror(errno), speed);
return -1;
} else {
tcflush(fd, TCIOFLUSH);
return 1;
}
}
#endif
if (-1 == baudRate) {
snprintf(data->errorString, sizeof(data->errorString),
"Error baud rate of %d is not supported on your platform", data->baudRate);
return -1;
}
// If we have a good baud rate set it and lets go
cfsetospeed(&options, baudRate);
cfsetispeed(&options, baudRate);
// throw away all the buffered data
tcflush(fd, TCIOFLUSH);
// make the changes now
tcsetattr(fd, TCSANOW, &options);
return 1;
}
void EIO_Update(uv_work_t* req) {
ConnectionOptionsBaton* data = static_cast<ConnectionOptionsBaton*>(req->data);
setBaudRate(data);
}
int setup(int fd, OpenBaton *data) {
int dataBits = ToDataBitsConstant(data->dataBits);
if (-1 == dataBits) {
snprintf(data->errorString, sizeof(data->errorString),
"Invalid data bits setting %d", data->dataBits);
return -1;
}
// Snow Leopard doesn't have O_CLOEXEC
if (-1 == fcntl(fd, F_SETFD, FD_CLOEXEC)) {
snprintf(data->errorString, sizeof(data->errorString), "Error %s Cannot open %s", strerror(errno), data->path);
return -1;
}
// Get port configuration for modification
struct termios options;
tcgetattr(fd, &options);
// IGNPAR: ignore bytes with parity errors
options.c_iflag = IGNPAR;
// ICRNL: map CR to NL (otherwise a CR input on the other computer will not terminate input)
// Future potential option
// options.c_iflag = ICRNL;
// otherwise make device raw (no other input processing)
// Specify data bits
options.c_cflag &= ~CSIZE;
options.c_cflag |= dataBits;
options.c_cflag &= ~(CRTSCTS);
if (data->rtscts) {
options.c_cflag |= CRTSCTS;
// evaluate specific flow control options
}
options.c_iflag &= ~(IXON | IXOFF | IXANY);
if (data->xon) {
options.c_iflag |= IXON;
}
if (data->xoff) {
options.c_iflag |= IXOFF;
}
if (data->xany) {
options.c_iflag |= IXANY;
}
switch (data->parity) {
case SERIALPORT_PARITY_NONE:
options.c_cflag &= ~PARENB;
// options.c_cflag &= ~CSTOPB;
// options.c_cflag &= ~CSIZE;
// options.c_cflag |= CS8;
break;
case SERIALPORT_PARITY_ODD:
options.c_cflag |= PARENB;
options.c_cflag |= PARODD;
// options.c_cflag &= ~CSTOPB;
// options.c_cflag &= ~CSIZE;
// options.c_cflag |= CS7;
break;
case SERIALPORT_PARITY_EVEN:
options.c_cflag |= PARENB;
options.c_cflag &= ~PARODD;
// options.c_cflag &= ~CSTOPB;
// options.c_cflag &= ~CSIZE;
// options.c_cflag |= CS7;
break;
default:
snprintf(data->errorString, sizeof(data->errorString), "Invalid parity setting %d", data->parity);
return -1;
}
switch (data->stopBits) {
case SERIALPORT_STOPBITS_ONE:
options.c_cflag &= ~CSTOPB;
break;
case SERIALPORT_STOPBITS_TWO:
options.c_cflag |= CSTOPB;
break;
default:
snprintf(data->errorString, sizeof(data->errorString), "Invalid stop bits setting %d", data->stopBits);
return -1;
}
options.c_cflag |= CLOCAL; // ignore status lines
options.c_cflag |= CREAD; // enable receiver
if (data->hupcl) {
options.c_cflag |= HUPCL; // drop DTR (i.e. hangup) on close
}
// Raw output
options.c_oflag = 0;
// ICANON makes partial lines not readable. It should be optional.
// It works with ICRNL.
options.c_lflag = 0; // ICANON;
options.c_cc[VMIN]= data->vmin;
options.c_cc[VTIME]= data->vtime;
// Note that tcsetattr() returns success if any of the requested changes could be successfully carried out.
// Therefore, when making multiple changes it may be necessary to follow this call with a further call to
// tcgetattr() to check that all changes have been performed successfully.
// This also fails on OSX
tcsetattr(fd, TCSANOW, &options);
if (data->lock) {
if (-1 == flock(fd, LOCK_EX | LOCK_NB)) {
snprintf(data->errorString, sizeof(data->errorString), "Error %s Cannot lock port", strerror(errno));
return -1;
}
}
// Copy the connection options into the ConnectionOptionsBaton to set the baud rate
ConnectionOptions* connectionOptions = new ConnectionOptions();
connectionOptions->fd = fd;
connectionOptions->baudRate = data->baudRate;
if (-1 == setBaudRate(connectionOptions)) {
strncpy(data->errorString, connectionOptions->errorString, sizeof(data->errorString));
delete(connectionOptions);
return -1;
}
delete(connectionOptions);
// flush all unread and wrote data up to this point because it could have been received or sent with bad settings
// Not needed since setBaudRate does this for us
// tcflush(fd, TCIOFLUSH);
return 1;
}
void EIO_Close(uv_work_t* req) {
VoidBaton* data = static_cast<VoidBaton*>(req->data);
if (-1 == close(data->fd)) {
snprintf(data->errorString, sizeof(data->errorString),
"Error: %s, unable to close fd %d", strerror(errno), data->fd);
}
}
void EIO_Set(uv_work_t* req) {
SetBaton* data = static_cast<SetBaton*>(req->data);
int bits;
ioctl(data->fd, TIOCMGET, &bits);
bits &= ~(TIOCM_RTS | TIOCM_CTS | TIOCM_DTR | TIOCM_DSR);
if (data->rts) {
bits |= TIOCM_RTS;
}
if (data->cts) {
bits |= TIOCM_CTS;
}
if (data->dtr) {
bits |= TIOCM_DTR;
}
if (data->dsr) {
bits |= TIOCM_DSR;
}
int result = 0;
if (data->brk) {
result = ioctl(data->fd, TIOCSBRK, NULL);
} else {
result = ioctl(data->fd, TIOCCBRK, NULL);
}
if (-1 == result) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot set", strerror(errno));
return;
}
if (-1 == ioctl(data->fd, TIOCMSET, &bits)) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot set", strerror(errno));
return;
}
#if defined(__linux__)
int err = linuxSetLowLatencyMode(data->fd, data->lowLatency);
if (err == -1) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot get low latency", strerror(errno));
return;
} else if(err == -2) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot set low latency", strerror(errno));
return;
}
#endif
}
void EIO_Get(uv_work_t* req) {
GetBaton* data = static_cast<GetBaton*>(req->data);
int bits;
if (-1 == ioctl(data->fd, TIOCMGET, &bits)) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot get", strerror(errno));
return;
}
data->cts = bits & TIOCM_CTS;
data->dsr = bits & TIOCM_DSR;
data->dcd = bits & TIOCM_CD;
#if defined(__linux__) && defined(ASYNC_LOW_LATENCY)
bool lowlatency = false;
if (-1 == linuxGetLowLatencyMode(data->fd, &lowlatency)) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot get low latency", strerror(errno));
return;
}
data->lowLatency = lowlatency;
#else
data->lowLatency = false;
#endif
}
void EIO_GetBaudRate(uv_work_t* req) {
GetBaudRateBaton* data = static_cast<GetBaudRateBaton*>(req->data);
int outbaud = -1;
#if defined(__linux__) && defined(ASYNC_SPD_CUST)
if (-1 == linuxGetSystemBaudRate(data->fd, &outbaud)) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot get baud rate", strerror(errno));
return;
}
#else
snprintf(data->errorString, sizeof(data->errorString), "Error: System baud rate check not implemented on this platform");
return;
#endif
data->baudRate = outbaud;
}
void EIO_Flush(uv_work_t* req) {
VoidBaton* data = static_cast<VoidBaton*>(req->data);
if (-1 == tcflush(data->fd, TCIOFLUSH)) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot flush", strerror(errno));
return;
}
}
void EIO_Drain(uv_work_t* req) {
VoidBaton* data = static_cast<VoidBaton*>(req->data);
if (-1 == tcdrain(data->fd)) {
snprintf(data->errorString, sizeof(data->errorString), "Error: %s, cannot drain", strerror(errno));
return;
}
}