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#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "console.h"
#include "util.h"
#include "udpcast.h"
#ifndef __MINGW32__
#include <termios.h>
struct console_t {
int fd; /* Filedescriptor for console, or -1 if disabled */
struct termios oldtio; /* old settings, for restore */
int needClose; /* Does file descriptor need to be closed on reset? */
int needRestore; /* Is the file descriptor indeed a terminal, and needs
* to be restored? */
};
console_t *prepareConsole(int fd) {
struct termios newtio;
int needClose=0;
console_t *c;
if(fd < 0) {
fd = open("/dev/tty", O_RDWR);
if(fd < 0) {
fprintf(stderr, "Could not open keyboard: %s\n", strerror(errno));
return NULL;
}
needClose=1;
}
c = MALLOC(console_t);
if(c == NULL)
return c;
c->fd = fd;
c->needClose = needClose;
c->needRestore = 0;
if(tcgetattr(c->fd, &c->oldtio) >= 0) {
newtio = c->oldtio;
newtio.c_lflag &= ~ECHO;
newtio.c_lflag &= ~ICANON;
newtio.c_cc[VMIN] = 1;
newtio.c_cc[VTIME] = 0;
if(tcsetattr(c->fd, TCSAFLUSH, &newtio) < 0)
perror("Set terminal to raw");
else
c->needRestore = 1;
}
return c;
}
int selectWithConsole(console_t *con, int maxFd,
fd_set *read_set, struct timeval *tv,
int *keyPressed) {
int ret;
if(con) {
int fd = con->fd;
FD_SET(fd, read_set);
if(fd >= maxFd)
maxFd = fd+1;
}
ret = select(maxFd, read_set, NULL, NULL, tv);
if(ret < 0)
return -1;
if(con && FD_ISSET(con->fd, read_set)) {
*keyPressed = 1;
}
return ret;
}
void restoreConsole(console_t **cp, int doConsume) {
console_t *c=*cp;
int ch='\0';
int r UNUSED;
if(c == NULL)
return;
/* If key pressed, consume it. If letter is q, quit */
if(doConsume) {
r = read(c->fd, &ch, 1);
}
if(c->needRestore && tcsetattr(c->fd, TCSAFLUSH, &c->oldtio) < 0) {
perror("Restore terminal settings");
}
*cp = NULL;
if(c->needClose)
close(c->fd);
free(c);
if(ch == 'q')
exit(1);
}
#else /* __MINGW32__ */
#include "log.h"
struct console_t {
HANDLE thread[2]; /* 0: console, 1: select */
int fd;
int maxFd;
fd_set read_set;
struct timeval tv;
struct timeval *tvp;
int select_return;
int keyPressed;
char ch;
};
static DWORD WINAPI waitForKeyPress(LPVOID lpParameter) {
console_t *con = lpParameter;
int n=read(con->fd, &con->ch, 1);
if(n == 1)
con->keyPressed=1;
return 0;
}
static DWORD WINAPI waitForSelect(LPVOID lpParameter) {
console_t *con = lpParameter;
con->select_return = select(con->maxFd, &con->read_set,
NULL, NULL, con->tvp);
return 0;
}
console_t *prepareConsole(int fd) {
console_t *con;
if(fd < 0) {
fd = open("CON", O_RDONLY);
if(fd < 0)
return NULL;
} else {
fd = dup(fd); /* dup console filedescriptor in order to avoid
* race with pipe spawner... */
}
con = MALLOC(console_t);
if(con == NULL)
return con;
con->thread[0] = con->thread[1] = NULL;
con->keyPressed=0;
con->fd = fd;
return con;
}
static HANDLE startThread(console_t *con,
LPTHREAD_START_ROUTINE lpStartAddress) {
/* Start thread ...
* see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/createthread.asp
*/
return CreateThread(NULL, /* lpThreadAttributes */
0, /* dwStackSize */
lpStartAddress,
con, /* lpParameter */
0, /* dwCreationFlags */
NULL /* lpThreadId */);
}
int selectWithConsole(console_t *con, int maxFd,
fd_set *read_set, struct timeval *tv,
int *keyPressed) {
int r;
if(con == NULL)
return select(maxFd, read_set, NULL, NULL, tv);
if(!con->thread[0]) {
con->thread[0]=startThread(con, waitForKeyPress);
if(!con->thread[0])
udpc_fatal(1, "Could not start console listen thread");
}
if(con->thread[1])
udpc_fatal(1, "Two select threads started at once!");
con->maxFd = maxFd;
memcpy(&con->read_set, read_set, sizeof(*read_set));
if(tv) {
memcpy(&con->tv, tv, sizeof(*tv));
con->tvp = &con->tv;
} else {
con->tvp=NULL;
}
/* Start select thread */
con->thread[1]=startThread(con, waitForSelect);
if(!con->thread[1])
udpc_fatal(1, "Could not start select thread");
/* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/waitformultipleobjects.asp
*/
switch( (r=WaitForMultipleObjects(2, con->thread, FALSE, INFINITE)) ) {
case WAIT_OBJECT_0:
*keyPressed=1;
CloseHandle(con->thread[0]);
CloseHandle(con->thread[1]);
FD_ZERO(read_set);
return 1;
case WAIT_OBJECT_0+1:
*keyPressed=0;
CloseHandle(con->thread[1]);
con->thread[1]=NULL;
memcpy(read_set, &con->read_set, sizeof(*read_set));
return con->select_return;
default:
udpc_fatal(1, "Unexpected result %d for waitForMultipleObjects", r);
return -1;
}
}
void restoreConsole(console_t **cp, int doConsume) {
console_t *c=*cp;
/* If key pressed, consume it. If letter is q, quit */
if(doConsume) {
if (c->keyPressed && c->ch == 'q') {
exit(1);
}
}
/* We do not free the console, because the select thread might
* still be active... */
*cp = NULL;
}
#endif /* __MINGW32__ */
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