bc: convert to "G trick" - this returns bc to zero bss increase

[oweals/busybox.git] / coreutils / usleep.c

diff --git a/coreutils/usleep.c b/coreutils/usleep.c
index e7acd5f82979b18d419ec57f9bfcb373b97075b8..684ab781b179ec73e783e2af6c5f580d7b6f94f0 100644 (file)
--- a/coreutils/usleep.c
+++ b/coreutils/usleep.c
@@ -4,11 +4,29 @@
  *
  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+//config:config USLEEP
+//config:      bool "usleep (1.1 kb)"
+//config:      default y
+//config:      help
+//config:      usleep is used to pause for a specified number of microseconds.
+
+//applet:IF_USLEEP(APPLET_NOFORK(usleep, usleep, BB_DIR_BIN, BB_SUID_DROP, usleep))
+
+//kbuild:lib-$(CONFIG_USLEEP) += usleep.o
 
 /* BB_AUDIT SUSv3 N/A -- Apparently a busybox extension. */
 
+//usage:#define usleep_trivial_usage
+//usage:       "N"
+//usage:#define usleep_full_usage "\n\n"
+//usage:       "Pause for N microseconds"
+//usage:
+//usage:#define usleep_example_usage
+//usage:       "$ usleep 1000000\n"
+//usage:       "[pauses for 1 second]\n"
+
 #include "libbb.h"
 
 /* This is a NOFORK applet. Be very careful! */
@@ -20,9 +38,14 @@ int usleep_main(int argc UNUSED_PARAM, char **argv)
                bb_show_usage();
        }
 
-       if (usleep(xatou(argv[1]))) {
-               bb_perror_nomsg_and_die();
-       }
+       /* Safe wrt NOFORK? (noforks are not allowed to run for
+        * a long time). Try "usleep 99999999" + ^C + "echo $?"
+        * in hush with FEATURE_SH_NOFORK=y.
+        * At least on uclibc, usleep() thanslates to nanosleep()
+        * which returns early on any signal (even caught one),
+        * and uclibc does not loop back on EINTR.
+        */
+       usleep(xatou(argv[1]));
 
        return EXIT_SUCCESS;
 }