Fix (compile '(setf function)).

[sbcl.git] / src / runtime / linux-os.c

diff --git a/src/runtime/linux-os.c b/src/runtime/linux-os.c
index bc87f2a..a23bc5d 100644 (file)
--- a/src/runtime/linux-os.c
+++ b/src/runtime/linux-os.c
@@ -55,6 +55,10 @@
 #else
 #include "cheneygc-internal.h"
 #endif
+#include <fcntl.h>
+#ifdef LISP_FEATURE_SB_WTIMER
+# include <sys/timerfd.h>
+#endif
 
 #ifdef LISP_FEATURE_X86
 /* Prototype for personality(2). Done inline here since the header file
@@ -269,7 +273,9 @@ os_init(char *argv[], char *envp[])
              * in an error or if the value didn't change. Otherwise
              * this might result in an infinite loop.
              */
-            if (retval != -1 && newpers != pers) {
+
+            if (!getenv("SBCL_IS_RESTARTING") &&
+                retval != -1 && newpers != pers) {
                 /* Use /proc/self/exe instead of trying to figure out
                  * the executable path from PATH and argv[0], since
                  * that's unreliable. We follow the symlink instead of
@@ -278,15 +284,21 @@ os_init(char *argv[], char *envp[])
                 char runtime[PATH_MAX+1];
                 int i = readlink("/proc/self/exe", runtime, PATH_MAX);
                 if (i != -1) {
+                    environ = envp;
+                    setenv("SBCL_IS_RESTARTING", "T", 1);
                     runtime[i] = '\0';
-                    execve(runtime, argv, envp);
+                    execv(runtime, argv);
                 }
             }
             /* Either changing the personality or execve() failed. Either
              * way we might as well continue, and hope that the random
              * memory maps are ok this time around.
              */
-            fprintf(stderr, "WARNING: Couldn't re-execute SBCL with the proper personality flags (maybe /proc isn't mounted?). Trying to continue anyway.\n");
+            fprintf(stderr, "WARNING:\
+\nCouldn't re-execute SBCL with proper personality flags (/proc isn't mounted? setuid?)\
+\nTrying to continue anyway.\n");
+        } else {
+            unsetenv("SBCL_IS_RESTARTING");
         }
     }
 #ifdef LISP_FEATURE_X86
@@ -482,3 +494,61 @@ os_get_runtime_executable_path(int external)
 
     return copied_string(path);
 }
+
+#ifdef LISP_FEATURE_SB_WTIMER
+/*
+ * Waitable timer implementation for the safepoint-based (SIGALRM-free)
+ * timer facility using timerfd_create().
+ */
+int
+os_create_wtimer()
+{
+    int fd = timerfd_create(CLOCK_MONOTONIC, 0);
+    if (fd == -1)
+        lose("os_create_wtimer: timerfd_create");
+
+    /* Cannot count on TFD_CLOEXEC availability, so do it manually: */
+    if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+        lose("os_create_wtimer: fcntl");
+
+    return fd;
+}
+
+int
+os_wait_for_wtimer(int fd)
+{
+    unsigned char buf[8];
+    int n = read(fd, buf, sizeof(buf));
+    if (n == -1) {
+        if (errno == EINTR)
+            return -1;
+        lose("os_wtimer_listen failed");
+    }
+    if (n != sizeof(buf))
+        lose("os_wtimer_listen read too little");
+    return 0;
+}
+
+void
+os_close_wtimer(int fd)
+{
+    if (close(fd) == -1)
+        lose("os_close_wtimer failed");
+}
+
+void
+os_set_wtimer(int fd, int sec, int nsec)
+{
+    struct itimerspec spec = { {0,0}, {0,0} };
+    spec.it_value.tv_sec = sec;
+    spec.it_value.tv_nsec = nsec;
+    if (timerfd_settime(fd, 0, &spec, 0) == -1)
+        lose("timerfd_settime");
+}
+
+void
+os_cancel_wtimer(int fd)
+{
+    os_set_wtimer(fd, 0, 0);
+}
+#endif