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debug: attempt to make the simulation deterministic by not returning until connection is made and command is receieved

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This commit is contained in:
Megan Wachs 2017-11-21 15:46:44 -08:00
parent 1d3fa07c44
commit 024cd52c44
1 changed files with 32 additions and 27 deletions
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59
csrc/remote_bitbang.cc
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@ -78,20 +78,23 @@ void remote_bitbang_t::accept()
{
fprintf(stderr,"Attempting to accept client socket\n");
client_fd = ::accept(socket_fd, NULL, NULL);
if (client_fd == -1) {
if (errno == EAGAIN) {
// No client waiting to connect right now.
fprintf(stderr, "Not Accepted: Received EAGAIN error\n");
int again = 1;
while (again != 0) {
client_fd = ::accept(socket_fd, NULL, NULL);
if (client_fd == -1) {
if (errno == EAGAIN) {
// No client waiting to connect right now.
} else {
fprintf(stderr, "failed to accept on socket: %s (%d)\n", strerror(errno),
errno);
again = 0;
abort();
}
} else {
fprintf(stderr, "failed to accept on socket: %s (%d)\n", strerror(errno),
errno);
abort();
fcntl(client_fd, F_SETFL, O_NONBLOCK);
fprintf(stderr, "Accepted successfully.");
again = 0;
}
} else {
fcntl(client_fd, F_SETFL, O_NONBLOCK);
fprintf(stderr, "Accepted successfully.");
}
}
@ -130,24 +133,26 @@ void remote_bitbang_t::set_pins(char _tck, char _tms, char _tdi){
void remote_bitbang_t::execute_command()
{
char command;
ssize_t num_read = read(client_fd, &command, sizeof(command));
if (num_read == -1) {
if (errno == EAGAIN) {
// We'll try again the next call.
fprintf(stderr, "Received no command. Will try again on the next call\n");
return;
int again = 1;
while (again) {
ssize_t num_read = read(client_fd, &command, sizeof(command));
if (num_read == -1) {
if (errno == EAGAIN) {
// We'll try again the next call.
fprintf(stderr, "Received no command. Will try again on the next call\n");
} else {
fprintf(stderr, "remote_bitbang failed to read on socket: %s (%d)\n",
strerror(errno), errno);
again = 0;
abort();
}
} else if (num_read == 0) {
fprintf(stderr, "No Command Received.\n");
again = 1;
} else {
fprintf(stderr, "remote_bitbang failed to read on socket: %s (%d)\n",
strerror(errno), errno);
abort();
again = 0;
}
}
if (num_read == 0) {
fprintf(stderr, "No Command Received.\n");
return;
}
fprintf(stderr, "Received a command %c\n", command);