here's a patch which detects & aborts if gpm is run on a serial console

--- src/headers/message.h
+++ src/headers/message.h
@@ -125,2 +125,3 @@
 #define GPM_MESS_OPEN_CON           "Opening console failed."
+#define GPM_MESS_OPEN_SERIALCON     "We seem to be on a serial console."
 #define GPM_MESS_READ_FIRST         "Error in read()ing first: %s"

--- ./src/gpm.c.org Sat Feb 23 16:42:23 2002
+++ ./src/gpm.c Tue Mar 12 00:20:19 2002
@@ -38,2 +38,3 @@
 #include <linux/vt.h>      /* VT_GETSTATE */
+#include <linux/serial.h>  /* for serial console check */
 #include <sys/kd.h>        /* KDGETMODE */
@@ -178,8 +154,21 @@
 static inline int open_console(const int mode)
 {
    int fd;
-
-   if ((fd=open(option.consolename, mode)) < 0)
-      gpm_report(GPM_PR_OOPS,GPM_MESS_OPEN_CON);
+   struct stat sb;
+   int maj, twelve=12;
+   struct serial_struct si;
+
+   fd = open(option.consolename, mode);
+   if (fd != -1) {
+      fstat(fd, &sb);
+      maj = major(sb.st_rdev);
+      if (maj != 4 && (maj < 136 || maj > 143)) {
+          if (ioctl (fd, TIOCLINUX, &twelve) < 0) {
+              if (si.line > 0)
+                  gpm_report(GPM_PR_OOPS,GPM_MESS_OPEN_SERIALCON);
+          }
+      }
    return fd;
+   } else
+   gpm_report(GPM_PR_OOPS,GPM_MESS_OPEN_CON);
 }

-mike
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