New file for -lutil incorporated from 4.4-Lite.
authorroland <roland>
Mon, 27 Mar 1995 09:23:02 +0000 (09:23 +0000)
committerroland <roland>
Mon, 27 Mar 1995 09:23:02 +0000 (09:23 +0000)
sysdeps/generic/pty.c [new file with mode: 0644]

diff --git a/sysdeps/generic/pty.c b/sysdeps/generic/pty.c
new file mode 100644 (file)
index 0000000..1644aee
--- /dev/null
@@ -0,0 +1,127 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)pty.c      8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <grp.h>
+
+openpty(amaster, aslave, name, termp, winp)
+       int *amaster, *aslave;
+       char *name;
+       struct termios *termp;
+       struct winsize *winp;
+{
+       static char line[] = "/dev/ptyXX";
+       register const char *cp1, *cp2;
+       register int master, slave, ttygid;
+       struct group *gr;
+
+       if ((gr = getgrnam("tty")) != NULL)
+               ttygid = gr->gr_gid;
+       else
+               ttygid = -1;
+
+       for (cp1 = "pqrs"; *cp1; cp1++) {
+               line[8] = *cp1;
+               for (cp2 = "0123456789abcdef"; *cp2; cp2++) {
+                       line[9] = *cp2;
+                       if ((master = open(line, O_RDWR, 0)) == -1) {
+                               if (errno == ENOENT)
+                                       return (-1);    /* out of ptys */
+                       } else {
+                               line[5] = 't';
+                               (void) chown(line, getuid(), ttygid);
+                               (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
+                               (void) revoke(line);
+                               if ((slave = open(line, O_RDWR, 0)) != -1) {
+                                       *amaster = master;
+                                       *aslave = slave;
+                                       if (name)
+                                               strcpy(name, line);
+                                       if (termp)
+                                               (void) tcsetattr(slave, 
+                                                       TCSAFLUSH, termp);
+                                       if (winp)
+                                               (void) ioctl(slave, TIOCSWINSZ, 
+                                                       (char *)winp);
+                                       return (0);
+                               }
+                               (void) close(master);
+                               line[5] = 'p';
+                       }
+               }
+       }
+       errno = ENOENT; /* out of ptys */
+       return (-1);
+}
+
+forkpty(amaster, name, termp, winp)
+       int *amaster;
+       char *name;
+       struct termios *termp;
+       struct winsize *winp;
+{
+       int master, slave, pid;
+
+       if (openpty(&master, &slave, name, termp, winp) == -1)
+               return (-1);
+       switch (pid = fork()) {
+       case -1:
+               return (-1);
+       case 0:
+               /* 
+                * child
+                */
+               (void) close(master);
+               login_tty(slave);
+               return (0);
+       }
+       /*
+        * parent
+        */
+       *amaster = master;
+       (void) close(slave);
+       return (pid);
+}