1 files changed, 109 insertions, 0 deletions
diff --git a/hw/xfree86/os-support/linux/lnx_kmod.c b/hw/xfree86/os-support/linux/lnx_kmod.c
new file mode 100644
index 000000000..0cb69b209
--- /dev/null
+++ b/hw/xfree86/os-support/linux/lnx_kmod.c
@@ -0,0 +1,109 @@
+/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/lnx_kmod.c,v 3.6 2001/10/31 22:50:30 tsi Exp $ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include "xf86_OSlib.h"
+#include "xf86.h"
+
+
+#define MODPROBE_PATH_FILE      "/proc/sys/kernel/modprobe"
+#define MAX_PATH                1024
+
+
+#if 0
+/* XFree86 #defines execl to be the xf86execl() function which does
+ * a fork AND exec.  We don't want that.  We want the regular,
+ * standard execl().
+ */
+#ifdef execl
+#undef execl
+#endif
+#endif
+
+
+/*
+ * Load a Linux kernel module.
+ * This is used by the DRI/DRM to load a DRM kernel module when
+ * the X server starts.  It could be used for other purposes in the future.
+ * Input:
+ *    modName - name of the kernel module (Ex: "tdfx")
+ * Return:
+ *    0 for failure, 1 for success
+ */
+int
+xf86LoadKernelModule(const char *modName)
+{
+   char mpPath[MAX_PATH] = "";
+   int fd = -1, status, n;
+   pid_t pid;
+
+   /* get the path to the modprobe program */
+   fd = open(MODPROBE_PATH_FILE, O_RDONLY);
+   if (fd >= 0) {
+      int count = read(fd, mpPath, MAX_PATH - 1);
+      if (count <= 0) {
+         mpPath[0] = 0;
+      }
+      else if (mpPath[count - 1] == '\n') {
+         mpPath[count - 1] = 0;  /* replaces \n with \0 */
+      }
+      close(fd);
+      /* if this worked, mpPath will be "/sbin/modprobe" or similar. */
+   }
+
+   if (mpPath[0] == 0) {
+      /* we failed to get the path from the system, use a default */
+      strcpy(mpPath, "/sbin/modprobe");
+   }
+
+   /* now fork/exec the modprobe command */
+   /*
+    * It would be good to capture stdout/stderr so that it can be directed
+    * to the log file.  modprobe errors currently are missing from the log
+    * file.
+    */
+   switch (pid = fork()) {
+   case 0:  /* child */
+      /* change real/effective user ID to 0/0 as we need to
+       * preinstall agpgart module for some DRM modules 
+       */
+      if (setreuid(0,0)) {
+         xf86Msg(X_WARNING,"LoadKernelModule: "
+		 "Setting of real/effective user Id to 0/0 failed");
+      }
+      setenv("PATH","/sbin",1);
+      n = execl(mpPath, "modprobe", modName, NULL);
+      xf86Msg(X_WARNING,"LoadKernelModule %s\n",strerror(errno));
+      exit(EXIT_FAILURE);  /* if we get here the child's exec failed */
+      break;
+   case -1:  /* fork failed */
+      return 0;
+   default:  /* fork worked */
+      {
+         /* XXX we loop over waitpid() because it sometimes fails on
+          * the first attempt.  Don't know why!
+          */
+         int count = 0, p;
+         do {
+            p = waitpid(pid, &status, 0);
+         } while (p == -1 && count++ < 4);
+
+         if (p == -1) {
+            return 0;
+         }
+
+         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
+            return 1;  /* success! */
+         }
+         else {
+            return 0;
+         }
+      }
+   }
+
+   /* never get here */
+   return 0;
+}