create qemu_openpty_raw() helper function and move it to a separate file

In two places qemu uses openpty() which is very system-dependent,
and in both places the pty is switched to raw mode as well.
Make a wrapper function which does both steps, and move all the
system-dependent complexity into a separate file, together
with static/local implementations of openpty() and cfmakeraw()
from qemu-char.c.

It is in a separate file, not part of oslib-posix.c, because
openpty() often resides in -lutil which is not linked to
every program qemu builds.

This change removes #including of <pty.h>, <termios.h>
and other rather specific system headers out of qemu-common.h,
which isn't a place for such specific headers really.

This version has been verified to build correctly on Linux,
OpenBSD, FreeBSD and OpenIndiana.  On the latter it lets qemu
to be built with gtk gui which were not possible there due to
missing openpty() and cfmakeraw().

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Tested-by: Andreas Färber <andreas.faerber@web.de>
(cherry picked from commit 4efeabbbe8441cc327052304976c7b9b86309d72)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

1 files changed, 5 insertions, 72 deletions

diff --git a/qemu-char.c b/qemu-char.c
index a81fc4c9d6..efe706df3f 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -966,63 +966,6 @@ static CharDriverState *qemu_chr_open_stdio(ChardevStdio *opts)
     return chr;
 }
 
-#ifdef __sun__
-/* Once Solaris has openpty(), this is going to be removed. */
-static int openpty(int *amaster, int *aslave, char *name,
-                   struct termios *termp, struct winsize *winp)
-{
-        const char *slave;
-        int mfd = -1, sfd = -1;
-
-        *amaster = *aslave = -1;
-
-        mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
-        if (mfd < 0)
-                goto err;
-
-        if (grantpt(mfd) == -1 || unlockpt(mfd) == -1)
-                goto err;
-
-        if ((slave = ptsname(mfd)) == NULL)
-                goto err;
-
-        if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1)
-                goto err;
-
-        if (ioctl(sfd, I_PUSH, "ptem") == -1 ||
-            (termp != NULL && tcgetattr(sfd, termp) < 0))
-                goto err;
-
-        if (amaster)
-                *amaster = mfd;
-        if (aslave)
-                *aslave = sfd;
-        if (winp)
-                ioctl(sfd, TIOCSWINSZ, winp);
-
-        return 0;
-
-err:
-        if (sfd != -1)
-                close(sfd);
-        close(mfd);
-        return -1;
-}
-
-static void cfmakeraw (struct termios *termios_p)
-{
-        termios_p->c_iflag &=
-                ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
-        termios_p->c_oflag &= ~OPOST;
-        termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
-        termios_p->c_cflag &= ~(CSIZE|PARENB);
-        termios_p->c_cflag |= CS8;
-
-        termios_p->c_cc[VMIN] = 0;
-        termios_p->c_cc[VTIME] = 0;
-}
-#endif
-
 #if defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
     || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
     || defined(__GLIBC__)
@@ -1194,34 +1137,24 @@ static CharDriverState *qemu_chr_open_pty(const char *id,
 {
     CharDriverState *chr;
     PtyCharDriver *s;
-    struct termios tty;
     int master_fd, slave_fd;
-#if defined(__OpenBSD__) || defined(__DragonFly__)
     char pty_name[PATH_MAX];
-#define q_ptsname(x) pty_name
-#else
-    char *pty_name = NULL;
-#define q_ptsname(x) ptsname(x)
-#endif
 
-    if (openpty(&master_fd, &slave_fd, pty_name, NULL, NULL) < 0) {
+    master_fd = qemu_openpty_raw(&slave_fd, pty_name);
+    if (master_fd < 0) {
         return NULL;
     }
 
-    /* Set raw attributes on the pty. */
-    tcgetattr(slave_fd, &tty);
-    cfmakeraw(&tty);
-    tcsetattr(slave_fd, TCSAFLUSH, &tty);
     close(slave_fd);
 
     chr = g_malloc0(sizeof(CharDriverState));
 
-    chr->filename = g_strdup_printf("pty:%s", q_ptsname(master_fd));
-    ret->pty = g_strdup(q_ptsname(master_fd));
+    chr->filename = g_strdup_printf("pty:%s", pty_name);
+    ret->pty = g_strdup(pty_name);
     ret->has_pty = true;
 
     fprintf(stderr, "char device redirected to %s (label %s)\n",
-            q_ptsname(master_fd), id);
+            pty_name, id);
 
     s = g_malloc0(sizeof(PtyCharDriver));
     chr->opaque = s;