1 files changed, 92 insertions, 0 deletions
diff --git a/sntp/unix.c b/sntp/unix.c
new file mode 100644
index 000000000000..c9d5d74c301d
--- /dev/null
+++ b/sntp/unix.c
@@ -0,0 +1,92 @@
+/*  Copyright (C) 1996 N.M. Maclaren
+    Copyright (C) 1996 The University of Cambridge
+
+This includes code that really should have been part of ANSI/ISO C, but was
+left out for historical reasons (despite requests to define ftty), plus
+the get_lock() and log_message() functions.
+*/
+
+#include "header.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <signal.h>
+
+#define UNIX
+#include "kludges.h"
+#undef UNIX
+
+
+void do_nothing (int seconds) {
+
+/* Wait for a fixed period, possibly uninterruptibly.  This should not wait
+for less than the specified period, if that can be avoided. */
+
+    sleep((unsigned int)(seconds+2));          /* +2 is enough for POSIX */
+}
+
+
+
+int ftty (FILE *file) {
+
+/* Return whether the file is attached to an interactive device. */
+
+    return isatty(fileno(file));
+}
+
+
+
+void set_lock (int lock) {
+
+/* Check that we have enough privileges to reset the time and that no other
+updating msntp process is running, but don't bother with fancy interlocking.
+This function is really only to permit the daemon mode to be restarted in a
+cron job and improve the diagnostics; it can be replaced by a 'return'
+statement if it causes implementation difficulties.  Note that there is little
+point in clearing the lock under Unix, but do so anyway. */
+
+    FILE *file;
+    long pid;
+
+    if (lockname == NULL || lockname[0] == '\0') return;
+    if (lock) {
+        errno = 0;
+        if ((file = fopen(lockname,"r")) != NULL &&
+                fscanf(file,"%ld",&pid) == 1 && kill(pid,0) == 0) {
+            if (verbose || isatty(STDIN_FILENO) || isatty(STDOUT_FILENO))
+                fatal(0,"another msntp process is currently running",NULL);
+            else
+                fatal(0,NULL,NULL);
+        }
+        if (file != NULL) fclose(file);
+        errno = 0;
+        if ((file = fopen(lockname,"w")) == NULL ||
+                fprintf(file,"%ld\n",(long)getpid()) <= 0 ||
+                ferror(file) || fclose(file) != 0)
+            fatal(1,"unable to write PID to %s",lockname);
+        adjust_time(0.0,1,0.0);
+    } else {
+        errno = 0;
+        if (remove(lockname) != 0)
+            fatal(1,"unable to remove the msntp lockname %s",lockname);
+    }
+}       
+
+
+
+/*
+ * Log a message, crudely.
+ * This is used in only one place, but could be used more widely.
+ */
+
+void
+log_message (const char *message)
+{
+
+    syslog(
+#ifdef LOG_DAEMON
+	LOG_DAEMON |
+#endif
+	LOG_WARNING, "%s", message);
+}