libserialport_internal.h

   1 /*
   2  * This file is part of the libserialport project.
   3  *
   4  * Copyright (C) 2014 Martin Ling <martin-libserialport@earth.li>
   5  * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Lesser General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #ifndef LIBSERIALPORT_LIBSERIALPORT_INTERNAL_H
  22 #define LIBSERIALPORT_LIBSERIALPORT_INTERNAL_H
  23
  24 /* These MSVC-specific defines must appear before other headers.*/
  25 #ifdef _MSC_VER
  26 #define _CRT_NONSTDC_NO_DEPRECATE
  27 #define _CRT_SECURE_NO_WARNINGS
  28 #endif
  29
  30 /* These feature test macros must appear before other headers.*/
  31 #if defined(__linux__) || defined(__CYGWIN__)
  32 /* For timeradd, timersub, timercmp, realpath. */
  33 #define _BSD_SOURCE 1 /* for glibc < 2.19 */
  34 #define _DEFAULT_SOURCE 1 /* for glibc >= 2.20 */
  35 /* For clock_gettime and associated types. */
  36 #define _POSIX_C_SOURCE 199309L
  37 #endif
  38
  39 #ifdef LIBSERIALPORT_ATBUILD
  40 /* If building with autoconf, include the generated config.h. */
  41 #include <config.h>
  42 #endif
  43
  44 #ifdef LIBSERIALPORT_MSBUILD
  45 /* If building with MS tools, define necessary things that
  46    would otherwise appear in config.h. */
  47 #define SP_PRIV
  48 #endif
  49
  50 #include "libserialport.h"
  51
  52 #include <string.h>
  53 #include <sys/types.h>
  54 #include <sys/stat.h>
  55 #include <fcntl.h>
  56 #include <stdlib.h>
  57 #include <errno.h>
  58 #include <stdio.h>
  59 #include <stdarg.h>
  60 #include <stdbool.h>
  61 #include <stdint.h>
  62 #ifdef _WIN32
  63 #include <windows.h>
  64 #include <tchar.h>
  65 #include <setupapi.h>
  66 #include <cfgmgr32.h>
  67 #undef DEFINE_GUID
  68 #define DEFINE_GUID(name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) \
  69         static const GUID name = { l,w1,w2,{ b1,b2,b3,b4,b5,b6,b7,b8 } }
  70 #include <usbioctl.h>
  71 #include <usbiodef.h>
  72 /* The largest size that can be passed to WriteFile() safely
  73  * on any architecture. This arises from the expression:
  74  * PAGE_SIZE * (65535 - sizeof(MDL)) / sizeof(ULONG_PTR)
  75  * and this worst-case value is found on x64. */
  76 #define WRITEFILE_MAX_SIZE 33525760
  77 #else
  78 #include <limits.h>
  79 #include <termios.h>
  80 #include <sys/ioctl.h>
  81 #include <sys/time.h>
  82 #include <time.h>
  83 #include <poll.h>
  84 #include <unistd.h>
  85 #ifdef HAVE_SYS_FILE_H
  86 #include <sys/file.h>
  87 #endif
  88 #endif
  89 #ifdef __APPLE__
  90 #include <CoreFoundation/CoreFoundation.h>
  91 #include <IOKit/IOKitLib.h>
  92 #include <IOKit/serial/IOSerialKeys.h>
  93 #include <IOKit/serial/ioss.h>
  94 #include <sys/syslimits.h>
  95 #include <mach/mach_time.h>
  96 #endif
  97 #ifdef __linux__
  98 #include <dirent.h>
  99 /* Android only has linux/serial.h from platform 21 onwards. */
 100 #if !(defined(__ANDROID__) && (__ANDROID_API__ < 21))
 101 #include <linux/serial.h>
 102 #endif
 103 #include "linux_termios.h"
 104
 105 /* TCGETX/TCSETX is not available everywhere. */
 106 #if defined(TCGETX) && defined(TCSETX) && defined(HAVE_STRUCT_TERMIOX)
 107 #define USE_TERMIOX
 108 #endif
 109 #endif
 110
 111 /* TIOCINQ/TIOCOUTQ is not available everywhere. */
 112 #if !defined(TIOCINQ) && defined(FIONREAD)
 113 #define TIOCINQ FIONREAD
 114 #endif
 115 #if !defined(TIOCOUTQ) && defined(FIONWRITE)
 116 #define TIOCOUTQ FIONWRITE
 117 #endif
 118
 119 /*
 120  * O_CLOEXEC is not available everywhere, fallback to not setting the
 121  * flag on those systems.
 122  */
 123 #ifndef _WIN32
 124 #ifndef O_CLOEXEC
 125 #define O_CLOEXEC 0
 126 #endif
 127 #endif
 128
 129 /* Non-standard baudrates are not available everywhere. */
 130 #if (defined(HAVE_TERMIOS_SPEED) || defined(HAVE_TERMIOS2_SPEED)) && HAVE_DECL_BOTHER
 131 #define USE_TERMIOS_SPEED
 132 #endif
 133
 134 struct sp_port {
 135         char *name;
 136         char *description;
 137         enum sp_transport transport;
 138         int usb_bus;
 139         int usb_address;
 140         int usb_vid;
 141         int usb_pid;
 142         char *usb_manufacturer;
 143         char *usb_product;
 144         char *usb_serial;
 145         char *bluetooth_address;
 146 #ifdef _WIN32
 147         char *usb_path;
 148         HANDLE hdl;
 149         COMMTIMEOUTS timeouts;
 150         OVERLAPPED write_ovl;
 151         OVERLAPPED read_ovl;
 152         OVERLAPPED wait_ovl;
 153         DWORD events;
 154         BYTE *write_buf;
 155         DWORD write_buf_size;
 156         BOOL writing;
 157         BOOL wait_running;
 158 #else
 159         int fd;
 160 #endif
 161 };
 162
 163 struct sp_port_config {
 164         int baudrate;
 165         int bits;
 166         enum sp_parity parity;
 167         int stopbits;
 168         enum sp_rts rts;
 169         enum sp_cts cts;
 170         enum sp_dtr dtr;
 171         enum sp_dsr dsr;
 172         enum sp_xonxoff xon_xoff;
 173 };
 174
 175 struct port_data {
 176 #ifdef _WIN32
 177         DCB dcb;
 178 #else
 179         struct termios term;
 180         int controlbits;
 181         int termiox_supported;
 182         int rts_flow;
 183         int cts_flow;
 184         int dtr_flow;
 185         int dsr_flow;
 186 #endif
 187 };
 188
 189 #ifdef _WIN32
 190 typedef HANDLE event_handle;
 191 #else
 192 typedef int event_handle;
 193 #endif
 194
 195 /* Standard baud rates. */
 196 #ifdef _WIN32
 197 #define BAUD_TYPE DWORD
 198 #define BAUD(n) {CBR_##n, n}
 199 #else
 200 #define BAUD_TYPE speed_t
 201 #define BAUD(n) {B##n, n}
 202 #endif
 203
 204 struct std_baudrate {
 205         BAUD_TYPE index;
 206         int value;
 207 };
 208
 209 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
 210
 211 extern void (*sp_debug_handler)(const char *format, ...);
 212
 213 /* Debug output macros. */
 214 #define DEBUG_FMT(fmt, ...) do { \
 215         if (sp_debug_handler) \
 216                 sp_debug_handler(fmt ".\n", __VA_ARGS__); \
 217 } while (0)
 218 #define DEBUG(msg) DEBUG_FMT(msg, NULL)
 219 #define DEBUG_ERROR(err, msg) DEBUG_FMT("%s returning " #err ": " msg, __func__)
 220 #define DEBUG_FAIL(msg) do {               \
 221         char *errmsg = sp_last_error_message(); \
 222         DEBUG_FMT("%s returning SP_ERR_FAIL: " msg ": %s", __func__, errmsg); \
 223         sp_free_error_message(errmsg); \
 224 } while (0);
 225 #define RETURN() do { \
 226         DEBUG_FMT("%s returning", __func__); \
 227         return; \
 228 } while (0)
 229 #define RETURN_CODE(x) do { \
 230         DEBUG_FMT("%s returning " #x, __func__); \
 231         return x; \
 232 } while (0)
 233 #define RETURN_CODEVAL(x) do { \
 234         switch (x) { \
 235         case SP_OK: RETURN_CODE(SP_OK); \
 236         case SP_ERR_ARG: RETURN_CODE(SP_ERR_ARG); \
 237         case SP_ERR_FAIL: RETURN_CODE(SP_ERR_FAIL); \
 238         case SP_ERR_MEM: RETURN_CODE(SP_ERR_MEM); \
 239         case SP_ERR_SUPP: RETURN_CODE(SP_ERR_SUPP); \
 240         default: RETURN_CODE(SP_ERR_FAIL); \
 241         } \
 242 } while (0)
 243 #define RETURN_OK() RETURN_CODE(SP_OK);
 244 #define RETURN_ERROR(err, msg) do { \
 245         DEBUG_ERROR(err, msg); \
 246         return err; \
 247 } while (0)
 248 #define RETURN_FAIL(msg) do { \
 249         DEBUG_FAIL(msg); \
 250         return SP_ERR_FAIL; \
 251 } while (0)
 252 #define RETURN_INT(x) do { \
 253         int _x = x; \
 254         DEBUG_FMT("%s returning %d", __func__, _x); \
 255         return _x; \
 256 } while (0)
 257 #define RETURN_STRING(x) do { \
 258         char *_x = x; \
 259         DEBUG_FMT("%s returning %s", __func__, _x); \
 260         return _x; \
 261 } while (0)
 262 #define RETURN_POINTER(x) do { \
 263         void *_x = x; \
 264         DEBUG_FMT("%s returning %p", __func__, _x); \
 265         return _x; \
 266 } while (0)
 267 #define SET_ERROR(val, err, msg) do { DEBUG_ERROR(err, msg); val = err; } while (0)
 268 #define SET_FAIL(val, msg) do { DEBUG_FAIL(msg); val = SP_ERR_FAIL; } while (0)
 269 #define TRACE(fmt, ...) DEBUG_FMT("%s(" fmt ") called", __func__, __VA_ARGS__)
 270 #define TRACE_VOID() DEBUG_FMT("%s() called", __func__)
 271
 272 #define TRY(x) do { int retval = x; if (retval != SP_OK) RETURN_CODEVAL(retval); } while (0)
 273
 274 SP_PRIV struct sp_port **list_append(struct sp_port **list, const char *portname);
 275
 276 /* OS-specific Helper functions. */
 277 SP_PRIV enum sp_return get_port_details(struct sp_port *port);
 278 SP_PRIV enum sp_return list_ports(struct sp_port ***list);
 279
 280 /* Timing abstraction */
 281
 282 struct time {
 283 #ifdef _WIN32
 284         int64_t ticks;
 285 #else
 286         struct timeval tv;
 287 #endif
 288 };
 289
 290 struct timeout {
 291         unsigned int ms, limit_ms;
 292         struct time start, now, end, delta, delta_max;
 293         struct timeval delta_tv;
 294         bool calls_started, overflow;
 295 };
 296
 297 SP_PRIV void time_get(struct time *time);
 298 SP_PRIV void time_set_ms(struct time *time, unsigned int ms);
 299 SP_PRIV void time_add(const struct time *a, const struct time *b, struct time *result);
 300 SP_PRIV void time_sub(const struct time *a, const struct time *b, struct time *result);
 301 SP_PRIV bool time_greater(const struct time *a, const struct time *b);
 302 SP_PRIV void time_as_timeval(const struct time *time, struct timeval *tv);
 303 SP_PRIV unsigned int time_as_ms(const struct time *time);
 304 SP_PRIV void timeout_start(struct timeout *timeout, unsigned int timeout_ms);
 305 SP_PRIV void timeout_limit(struct timeout *timeout, unsigned int limit_ms);
 306 SP_PRIV bool timeout_check(struct timeout *timeout);
 307 SP_PRIV void timeout_update(struct timeout *timeout);
 308 SP_PRIV struct timeval *timeout_timeval(struct timeout *timeout);
 309 SP_PRIV unsigned int timeout_remaining_ms(struct timeout *timeout);
 310
 311 #endif