| 1 | /* Remote serial interface for OS's with sgttyb |
| 2 | Copyright 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/time.h> |
| 23 | #include <fcntl.h> |
| 24 | #include "serial.h" |
| 25 | |
| 26 | static int desc = -1; |
| 27 | |
| 28 | void |
| 29 | serial_raw(fd, oldstate) |
| 30 | int fd; |
| 31 | struct ttystate *oldstate; |
| 32 | { |
| 33 | struct sgttyb sgttyb; |
| 34 | |
| 35 | oldstate->flags = fcntl(fd, F_GETFL, 0); |
| 36 | |
| 37 | fcntl(fd, F_SETFL, oldstate->flags|FNDELAY); |
| 38 | |
| 39 | if (ioctl(fd, TIOCGETP, &sgttyb)) |
| 40 | { |
| 41 | fprintf(stderr, "TIOCGETP failed: %s\n", safe_strerror(errno)); |
| 42 | } |
| 43 | |
| 44 | oldstate->sgttyb = sgttyb; |
| 45 | |
| 46 | sgttyb.sg_flags = RAW; |
| 47 | |
| 48 | if (ioctl(fd, TIOCSETP, &sgttyb)) |
| 49 | { |
| 50 | fprintf(stderr, "TIOCSETP failed: %s\n", safe_strerror(errno)); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | void |
| 55 | serial_restore(fd, oldstate) |
| 56 | int fd; |
| 57 | struct ttystate *oldstate; |
| 58 | { |
| 59 | fcntl(fd, F_SETFL, oldstate->flags); |
| 60 | |
| 61 | ioctl(fd, TIOCSETP, &oldstate->sgttyb); |
| 62 | } |
| 63 | |
| 64 | static struct ttystate oldstate; |
| 65 | |
| 66 | static fd_set readfds; |
| 67 | |
| 68 | int |
| 69 | serial_open(name) |
| 70 | const char *name; |
| 71 | { |
| 72 | struct sgttyb sgttyb; |
| 73 | |
| 74 | desc = open (name, O_RDWR); |
| 75 | if (desc < 0) |
| 76 | error("Open of %s failed: %s", name, safe_strerror(errno)); |
| 77 | |
| 78 | serial_raw(desc, &oldstate); |
| 79 | |
| 80 | /* Setup constant stuff for select */ |
| 81 | |
| 82 | FD_ZERO(&readfds); |
| 83 | |
| 84 | return desc; |
| 85 | } |
| 86 | |
| 87 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds |
| 88 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns |
| 89 | char if successful. Returns -2 if timeout expired, EOF if line dropped |
| 90 | dead, or -3 for any other error (see errno in that case). */ |
| 91 | |
| 92 | int |
| 93 | serial_readchar(timeout) |
| 94 | int timeout; |
| 95 | { |
| 96 | static unsigned char buf[BUFSIZ]; |
| 97 | static unsigned char *bufp; |
| 98 | static int bufcnt = 0; |
| 99 | int numfds; |
| 100 | struct timeval tv; |
| 101 | |
| 102 | if (bufcnt-- > 0) |
| 103 | return *bufp++; |
| 104 | |
| 105 | tv.tv_sec = timeout; |
| 106 | tv.tv_usec = 0; |
| 107 | |
| 108 | FD_SET(desc, &readfds); |
| 109 | |
| 110 | if (timeout >= 0) |
| 111 | numfds = select(desc+1, &readfds, 0, 0, &tv); |
| 112 | else |
| 113 | numfds = select(desc+1, &readfds, 0, 0, 0); |
| 114 | |
| 115 | if (numfds <= 0) |
| 116 | if (numfds == 0) |
| 117 | return -2; /* Timeout */ |
| 118 | else |
| 119 | return -3; /* Got an error from select */ |
| 120 | |
| 121 | bufcnt = read(desc, buf, BUFSIZ); |
| 122 | |
| 123 | if (bufcnt <= 0) |
| 124 | if (bufcnt == 0) |
| 125 | return EOF; /* 0 chars means end of file */ |
| 126 | else |
| 127 | return -3; /* Got an error from read */ |
| 128 | |
| 129 | bufcnt--; |
| 130 | bufp = buf; |
| 131 | return *bufp++; |
| 132 | } |
| 133 | |
| 134 | #ifndef B19200 |
| 135 | #define B19200 EXTA |
| 136 | #endif |
| 137 | |
| 138 | #ifndef B38400 |
| 139 | #define B38400 EXTB |
| 140 | #endif |
| 141 | |
| 142 | /* Translate baud rates from integers to damn B_codes. Unix should |
| 143 | have outgrown this crap years ago, but even POSIX wouldn't buck it. */ |
| 144 | |
| 145 | static struct |
| 146 | { |
| 147 | int rate; |
| 148 | int code; |
| 149 | } baudtab[] = { |
| 150 | {50, B50}, |
| 151 | {75, B75}, |
| 152 | {110, B110}, |
| 153 | {134, B134}, |
| 154 | {150, B150}, |
| 155 | {200, B200}, |
| 156 | {300, B300}, |
| 157 | {600, B600}, |
| 158 | {1200, B1200}, |
| 159 | {1800, B1800}, |
| 160 | {2400, B2400}, |
| 161 | {4800, B4800}, |
| 162 | {9600, B9600}, |
| 163 | {19200, B19200}, |
| 164 | {38400, B38400}, |
| 165 | {-1, -1}, |
| 166 | }; |
| 167 | |
| 168 | static int |
| 169 | rate_to_code(rate) |
| 170 | int rate; |
| 171 | { |
| 172 | int i; |
| 173 | |
| 174 | for (i = 0; baudtab[i].rate != -1; i++) |
| 175 | if (rate == baudtab[i].rate) |
| 176 | return baudtab[i].code; |
| 177 | |
| 178 | return -1; |
| 179 | } |
| 180 | |
| 181 | int |
| 182 | serial_setbaudrate(rate) |
| 183 | int rate; |
| 184 | { |
| 185 | struct sgttyb sgttyb; |
| 186 | |
| 187 | if (ioctl(desc, TIOCGETP, &sgttyb)) |
| 188 | error("TIOCGETP failed: %s\n", safe_strerror(errno)); |
| 189 | |
| 190 | sgttyb.sg_ospeed = rate_to_code(rate); |
| 191 | sgttyb.sg_ispeed = rate_to_code(rate); |
| 192 | |
| 193 | if (ioctl(desc, TIOCSETP, &sgttyb)) |
| 194 | error("TIOCSETP failed: %s\n", safe_strerror(errno)); |
| 195 | |
| 196 | return 1; |
| 197 | } |
| 198 | |
| 199 | int |
| 200 | serial_write(str, len) |
| 201 | const char *str; |
| 202 | int len; |
| 203 | { |
| 204 | int cc; |
| 205 | |
| 206 | while (len > 0) |
| 207 | { |
| 208 | cc = write(desc, str, len); |
| 209 | |
| 210 | if (cc < 0) |
| 211 | return 0; |
| 212 | len -= cc; |
| 213 | str += cc; |
| 214 | } |
| 215 | return 1; |
| 216 | } |
| 217 | |
| 218 | void |
| 219 | serial_close() |
| 220 | { |
| 221 | if (desc < 0) |
| 222 | return; |
| 223 | |
| 224 | serial_restore(desc, oldstate); |
| 225 | |
| 226 | close(desc); |
| 227 | desc = -1; |
| 228 | } |