console/xterm.c

   1 /* xterm.c */
   2
   3 /* This "driver" is designed to go on top of an existing driver
   4    to provide support for features only present if using an
   5    xterm or compatible program for your console output. It should
   6    inlcude such features as resizing, separation of output from the
   7    standard wine console, and a configurable title bar for
   8    Win32 console. */
   9 /* Right now, it doesn't have any "special" features */
  10
  11 #include <signal.h>
  12 #include <sys/ioctl.h>
  13 #include <fcntl.h>
  14 #include <unistd.h>
  15 #include <termios.h>
  16 #include <errno.h>
  17
  18 #include "windows.h"
  19 #include "console.h"
  20 #include "debug.h"
  21
  22 static BOOL32 wine_create_console(FILE **master, FILE **slave, int *pid);
  23 static FILE *wine_openpty(FILE **master, FILE **slave, char *name,
  24                         struct termios *term, struct winsize *winsize);
  25
  26 /* The console -- I chose to keep the master and slave
  27  * (UNIX) file descriptors around in case they are needed for
  28  * ioctls later.  The pid is needed to destroy the xterm on close
  29  */
  30 typedef struct _XTERM_CONSOLE {
  31         FILE    *master;                 /* xterm side of pty */
  32         FILE    *slave;                  /* wine side of pty */
  33         int     pid;                    /* xterm's pid, -1 if no xterm */
  34 } XTERM_CONSOLE;
  35
  36 static XTERM_CONSOLE xterm_console;
  37
  38 CONSOLE_device chain;
  39 FILE *old_in, *old_out;
  40
  41 void XTERM_Start()
  42 {
  43    /* Here, this is a supplementary driver so we should remember to call
  44       the chain. */
  45    chain.init = driver.init;
  46    driver.init = XTERM_Init;
  47
  48    chain.close = driver.close;
  49    driver.close = XTERM_Close;
  50 }
  51
  52 void XTERM_Init()
  53 {
  54    wine_create_console(&xterm_console.master, &xterm_console.slave,
  55       &xterm_console.pid);
  56
  57    old_in = driver.console_in;
  58    driver.console_in = xterm_console.slave;
  59
  60    old_out = driver.console_out;
  61    driver.console_out = xterm_console.slave;
  62
  63    /* Then call the chain... */
  64    if (chain.init)
  65       chain.init();
  66 }
  67
  68 void XTERM_Close()
  69 {
  70    /* Call the chain first... */
  71    if (chain.close)
  72       chain.close();
  73
  74    driver.console_in = old_in;
  75    driver.console_out = old_out;
  76
  77    /* make sure a xterm exists to kill */
  78    if (xterm_console.pid != -1) {
  79       kill(xterm_console.pid, SIGTERM);
  80    }
  81 }
  82
  83 /**
  84  *  It looks like the openpty that comes with glibc in RedHat 5.0
  85  *  is buggy (second call returns what looks like a dup of 0 and 1
  86  *  instead of a new pty), this is a generic replacement.
  87  */
  88 /** Can't we determine this using autoconf?
  89  */
  90
  91 static FILE *wine_openpty(FILE **master, FILE **slave, char *name,
  92                         struct termios *term, struct winsize *winsize)
  93 {
  94         FILE *fdm, *fds;
  95         char *ptr1, *ptr2;
  96         char pts_name[512];
  97
  98         strcpy (pts_name, "/dev/ptyXY");
  99         for (ptr1 = "pqrstuvwxyzPQRST"; *ptr1 != 0; ptr1++) {
 100                 pts_name[8] = *ptr1;
 101                 for (ptr2 = "0123456789abcdef"; *ptr2 != 0; ptr2++) {
 102                         pts_name[9] = *ptr2;
 103
 104                         if ((fdm = fopen(pts_name, "r+")) == NULL) {
 105                                 if (errno == ENOENT)
 106                                         return (FILE *) -1;
 107                                 else
 108                                         continue;
 109                         }
 110                         pts_name[5] = 't';
 111                         if ((fds = fopen(pts_name, "r+")) == NULL) {
 112                                 pts_name[5] = 'p';
 113                                 continue;
 114                         }
 115                         *master = fdm;
 116                         *slave = fds;
 117
 118                         if (term != NULL)
 119                                 tcsetattr(fileno(*slave), TCSANOW, term);
 120                         if (winsize != NULL)
 121                                 ioctl(fileno(*slave), TIOCSWINSZ, winsize);
 122
 123                         if (name != NULL)
 124                                 strcpy(name, pts_name);
 125                         return fds;
 126                 }
 127         }
 128         return (FILE *) -1;
 129 }
 130
 131 static BOOL32 wine_create_console(FILE **master, FILE **slave, int *pid)
 132 {
 133         struct termios term;
 134         char buf[1024];
 135         char c = '\0';
 136         int status = 0;
 137         int i;
 138
 139         if (tcgetattr(0, &term) < 0) return FALSE;
 140         term.c_lflag |= ICANON;
 141         term.c_lflag &= ~ECHO;
 142         if (wine_openpty(master, slave, NULL, &term, NULL) < 0)
 143            return FALSE;
 144
 145         if ((*pid=fork()) == 0) {
 146                 tcsetattr(fileno(*slave), TCSADRAIN, &term);
 147                 sprintf(buf, "-Sxx%d", fileno(*master));
 148                 execlp("xterm", "xterm", buf, NULL);
 149                 ERR(console, "error creating xterm\n");
 150                 exit(1);
 151         }
 152
 153         /* most xterms like to print their window ID when used with -S;
 154          * read it and continue before the user has a chance...
 155          * NOTE: this is the reason we started xterm with ECHO off,
 156          * we'll turn it back on below
 157          */
 158
 159         for (i=0; c!='\n'; (status=fread(&c, 1, 1, *slave)), i++) {
 160                 if (status == -1 && c == '\0') {
 161                                 /* wait for xterm to be created */
 162                         usleep(100);
 163                 }
 164                 if (i > 10000) {
 165                         WARN(console, "can't read xterm WID\n");
 166                         kill(*pid, SIGKILL);
 167                         return FALSE;
 168                 }
 169         }
 170         term.c_lflag |= ECHO;
 171         tcsetattr(fileno(*master), TCSADRAIN, &term);
 172
 173         return TRUE;
 174 }