Mercurial > repos > blastem

annotate termhelper.c @ 1637:95880d947257

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix for VRAM byte write order broke VDP FIFO testing ROM results. This change cleans up VRAM writes and fixes the regression while preserving the correct VRAM byte write order
author Michael Pavone <pavone@retrodev.com>
date Sun, 11 Nov 2018 22:39:29 -0800
parents 792be135d3af
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
794
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
1 #include <sys/types.h>
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
2 #include <sys/stat.h>
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
3 #include <fcntl.h>
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
4 #include <unistd.h>
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
5 #include <stdlib.h>
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
6 #include "terminal.h"
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
7
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
8 char buf[4096];
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
9
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
10 void copy_data(int to, int from)
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
11 {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
12 ssize_t bytes = read(from, buf, sizeof(buf));
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
13 while (bytes > 0)
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
14 {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
15 ssize_t written = write(to, buf, bytes);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
16 if (written == -1) {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
17 exit(1);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
18 }
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
19 bytes -= written;
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
20 }
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
21 }
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
22
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
23 int main(int argc, char **argv)
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
24 {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
25 //these will block so order is important
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
26 int input_fd = open(INPUT_PATH, O_WRONLY);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
27 int output_fd = open(OUTPUT_PATH, O_RDONLY);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
28 fd_set read_fds;
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
29 FD_ZERO(&read_fds);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
30 for (;;)
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
31 {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
32 FD_SET(STDIN_FILENO, &read_fds);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
33 FD_SET(output_fd, &read_fds);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
34 select(output_fd+1, &read_fds, NULL, NULL, NULL);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
35
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
36 if (FD_ISSET(STDIN_FILENO, &read_fds)) {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
37 copy_data(input_fd, STDIN_FILENO);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
38 }
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
39 if (FD_ISSET(output_fd, &read_fds)) {
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
40 copy_data(STDOUT_FILENO, output_fd);
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
41 }
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
42 }
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
43 return 0;
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
44 }