tools/gdb/serial.c

   1 /*
   2  * (C) Copyright 2000
   3  * Murray Jensen <Murray.Jensen@csiro.au>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include <fcntl.h>
  11 #include <sys/time.h>
  12 #include "serial.h"
  13
  14 #if defined(__sun__)     || \
  15     defined(__OpenBSD__) || \
  16     defined(__FreeBSD__) || \
  17     defined(__NetBSD__)  || \
  18     defined(__APPLE__)
  19 static struct termios tios = { BRKINT, 0, B115200|CS8|CREAD, 0, { 0 } };
  20 #else
  21 static struct termios tios = { BRKINT, 0, B115200|CS8|CREAD, 0,   0   };
  22 #endif
  23
  24 static struct speedmap {
  25     char *str;
  26     speed_t val;
  27 } speedmap[] = {
  28     { "50", B50 },              { "75", B75 },          { "110", B110 },
  29     { "134", B134 },            { "150", B150 },        { "200", B200 },
  30     { "300", B300 },            { "600", B600 },        { "1200", B1200 },
  31     { "1800", B1800 },          { "2400", B2400 },      { "4800", B4800 },
  32     { "9600", B9600 },          { "19200", B19200 },    { "38400", B38400 },
  33     { "57600", B57600 },
  34 #ifdef  B76800
  35     { "76800", B76800 },
  36 #endif
  37     { "115200", B115200 },
  38 #ifdef  B153600
  39     { "153600", B153600 },
  40 #endif
  41     { "230400", B230400 },
  42 #ifdef  B307200
  43     { "307200", B307200 },
  44 #endif
  45 #ifdef B460800
  46     { "460800", B460800 }
  47 #endif
  48 };
  49 static int nspeeds = sizeof speedmap / sizeof speedmap[0];
  50
  51 speed_t
  52 cvtspeed(char *str)
  53 {
  54     struct speedmap *smp = speedmap, *esmp = &speedmap[nspeeds];
  55
  56     while (smp < esmp) {
  57         if (strcmp(str, smp->str) == 0)
  58             return (smp->val);
  59         smp++;
  60     }
  61     return B0;
  62 }
  63
  64 int
  65 serialopen(char *device, speed_t speed)
  66 {
  67     int fd;
  68
  69     if (cfsetospeed(&tios, speed) < 0)
  70         return -1;
  71
  72     if ((fd = open(device, O_RDWR)) < 0)
  73         return -1;
  74
  75     if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
  76         (void)close(fd);
  77         return -1;
  78     }
  79
  80     return fd;
  81 }
  82
  83 int
  84 serialreadchar(int fd, int timeout)
  85 {
  86     fd_set fds;
  87     struct timeval tv;
  88     int n;
  89     char ch;
  90
  91     tv.tv_sec = timeout;
  92     tv.tv_usec = 0;
  93
  94     FD_ZERO(&fds);
  95     FD_SET(fd, &fds);
  96
  97     /* this is a fucking horrible quick hack - fix this */
  98
  99     if ((n = select(fd + 1, &fds, 0, 0, &tv)) < 0)
 100         return SERIAL_ERROR;
 101
 102     if (n == 0)
 103         return SERIAL_TIMEOUT;
 104
 105     if ((n = read(fd, &ch, 1)) < 0)
 106         return SERIAL_ERROR;
 107
 108     if (n == 0)
 109         return SERIAL_EOF;
 110
 111     return ch;
 112 }
 113
 114 int
 115 serialwrite(int fd, char *buf, int len)
 116 {
 117     int n;
 118
 119     do {
 120         n = write(fd, buf, len);
 121         if (n < 0)
 122             return 1;
 123         len -= n;
 124         buf += n;
 125     } while (len > 0);
 126     return 0;
 127 }
 128
 129 int
 130 serialclose(int fd)
 131 {
 132     return close(fd);
 133 }