(UNIX98_PTYS) [HAVE_GRANDPT]: Define.

(PTY_ITERATION, PTY_NAME_SPRINTF, PTY_OPEN, PTY_TTY_NAME_SPRINTF)
[HAVE_GRANDPT]: Define.
(C_SWITCH_SYSTEM): Add -D_XOPEN_SOURCE.

1 files changed, 40 insertions, 42 deletions

diff --git a/src/s/gnu-linux.h b/src/s/gnu-linux.h
index 8e39773c6c6..96ebc7a136a 100644
--- a/src/s/gnu-linux.h
+++ b/src/s/gnu-linux.h
@@ -54,58 +54,56 @@ Boston, MA 02111-1307, USA.  */
 #endif /* emacs */
 #endif /* NOT_C_CODE */
 
-/* Letter to use in finding device name of first pty,
-  if system supports pty's.  'p' means it is /dev/ptyp0  */
+#if defined HAVE_GRANTPT
+#define UNIX98_PTYS
 
-#define FIRST_PTY_LETTER 'p'
+/* Run only once.  We need a `for'-loop because the code uses
+   `continue'.  */
 
-#ifdef HAVE_DEV_PTMX
+#define PTY_ITERATION   for (i = 0; i < 1; i++)
 
-/* This is the same definition as in usg5-4.h, but with sigblock/sigunblock
-   rather than sighold/sigrelse, which appear to be BSD4.1 specific and won't
-   work if POSIX_SIGNALS is defined.  It may also be appropriate for SVR4.x
-   (x<2) but I'm not sure.   fnf@cygnus.com */
-/* This sets the name of the slave side of the PTY.  On SysVr4,
-   grantpt(3) forks a subprocess, so keep sigchld_handler() from
-   intercepting that death.  If any child but grantpt's should die
-   within, it should be caught after sigrelse(2). */
+#ifdef HAVE_GETPT
+#define PTY_NAME_SPRINTF
+#define PTY_OPEN fd = getpt ()
+#else /* not HAVE_GETPT */
+#define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
+#endif /* not HAVE_GETPT */
+
+/* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
+   prevent sigchld_handler from intercepting the child's death.  */
+
+#define PTY_TTY_NAME_SPRINTF                            \
+  {                                                     \
+    char *ptyname;                                      \
+                                                        \
+    sigblock (sigmask (SIGCHLD));                       \
+    if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
+        || !(ptyname = ptsname(fd)))                    \
+      {                                                 \
+        sigunblock (sigmask (SIGCHLD));                 \
+        close (fd);                                     \
+        return -1;                                      \
+      }                                                 \
+    strncpy (pty_name, ptyname, sizeof (pty_name));     \
+    pty_name[sizeof (pty_name) - 1] = 0;                \
+    sigunblock (sigmask (SIGCHLD));                     \
+  }
 
-#undef FIRST_PTY_LETTER
-#define FIRST_PTY_LETTER 'z'
+#else /* not HAVE_GRANDPT */
 
-/* This sets the name of the master side of the PTY. */
-#define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
+/* Letter to use in finding device name of first pty,
+   if system supports pty's.  'p' means it is /dev/ptyp0  */
 
-#undef PTY_TTY_NAME_SPRINTF
-/* This used to use SIGCLD, but that doesn't appear in glibc 2.1.  */
-#define PTY_TTY_NAME_SPRINTF                    \
-  {                                             \
-    char *ptsname (), *ptyname;                 \
-                                                \
-    sigblock (sigmask (SIGCHLD));               \
-    if (grantpt (fd) == -1)                     \
-      { close (fd); return -1; }                \
-    sigunblock (sigmask (SIGCHLD));             \
-    if (unlockpt (fd) == -1)                    \
-      { close (fd); return -1; }                \
-    if (!(ptyname = ptsname (fd)))              \
-      { close (fd); return -1; }                \
-    strncpy (pty_name, ptyname, sizeof (pty_name)); \
-    pty_name[sizeof (pty_name) - 1] = 0;        \
-  }
+#define FIRST_PTY_LETTER 'p'
 
-#endif /* HAVE_DEV_PTMX */
+#endif  /* not HAVE_GRANDPT */
 
-/*
- *      Define HAVE_TERMIOS if the system provides POSIX-style
- *      functions and macros for terminal control.
- */
+/*  Define HAVE_TERMIOS if the system provides POSIX-style
+    functions and macros for terminal control.  */
 
 #define HAVE_TERMIOS
 
-/*
- *      Define HAVE_PTYS if the system supports pty devices.
- */
+/* Define HAVE_PTYS if the system supports pty devices. */
 
 #define HAVE_PTYS
 
@@ -249,7 +247,7 @@ Boston, MA 02111-1307, USA.  */
 /* alane@wozzle.linet.org says that -lipc is not a separate library,
    since libc-4.4.1.  So -lipc was deleted.  */
 #define LIBS_SYSTEM
-#define C_SWITCH_SYSTEM -D_BSD_SOURCE
+#define C_SWITCH_SYSTEM -D_BSD_SOURCE -D_XOPEN_SOURCE
 #endif
 
 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */