check if we have ppp early on

[ppp.git] / pppd / sys-str.c

diff --git a/pppd/sys-str.c b/pppd/sys-str.c
index ecee95b576ff8b001a92ea4a9d013aa749991631..6bd2fc91b6cb5be54d43f7ec622834763bd61ffb 100644 (file)
--- a/pppd/sys-str.c
+++ b/pppd/sys-str.c
@@ -22,8 +22,10 @@
  * TODO:
  */
 
  * TODO:
  */
 

+#include <stdio.h>

 #include <errno.h>
 #include <syslog.h>
 #include <errno.h>
 #include <syslog.h>

+#include <fcntl.h>

 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/socket.h>


@@ -50,7 +52,24 @@ static struct        modlist {
 } str_modules[MAXMODULES];
 static int     str_module_count = 0;
 
 } str_modules[MAXMODULES];
 static int     str_module_count = 0;
 

-extern int hungup;
+extern int hungup;             /* has the physical layer been disconnected? */
+
+/*
+ * ppp_available - check if this kernel supports PPP.
+ */
+int
+ppp_available()
+{
+    int fd, ret;
+
+    fd = open("/dev/tty", O_RDONLY, 0);
+    if (fd < 0)
+       return 1;               /* can't find out - assume we have ppp */
+    ret = ioctl(fd, I_FIND, "pppasync") >= 0;
+    close(fd);
+    return ret;
+}
+

 
 /*
  * establish_ppp - Turn the serial port into a ppp interface.
 
 /*
  * establish_ppp - Turn the serial port into a ppp interface.