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authorDenys Vlasenko2014-06-22 13:54:40 +0200
committerDenys Vlasenko2014-06-22 13:54:40 +0200
commitf92f1d0181853b989f9377debb56902e3e21c9a8 (patch)
tree14c0bb888dea4b92e0f8dcaec2aa9c2a40eb3966 /libbb
parent6be3a5242ce4855734a4cdd5770b6ea7adaf2b3d (diff)
downloadbusybox-f92f1d0181853b989f9377debb56902e3e21c9a8.zip
busybox-f92f1d0181853b989f9377debb56902e3e21c9a8.tar.gz
find: use sysconf(_SC_ARG_MAX) to determine the command-line size limit
The find utility uses a hardcoded value of 32 * 1024 as the limit of the command-line length when calling 'find -exec ... {} +'. This results in over 4 times more execve() calls than in coreutils' find. This patch uses the limit defined in system headers. Based on the patch by Bartosz Golaszewski <bartekgola@gmail.com>. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb')
-rw-r--r--libbb/Kbuild.src1
-rw-r--r--libbb/sysconf.c16
2 files changed, 17 insertions, 0 deletions
diff --git a/libbb/Kbuild.src b/libbb/Kbuild.src
index 6578d11..62680bd 100644
--- a/libbb/Kbuild.src
+++ b/libbb/Kbuild.src
@@ -92,6 +92,7 @@ lib-y += skip_whitespace.o
lib-y += speed_table.o
lib-y += str_tolower.o
lib-y += strrstr.o
+lib-y += sysconf.o
lib-y += time.o
lib-y += trim.o
lib-y += u_signal_names.o
diff --git a/libbb/sysconf.c b/libbb/sysconf.c
new file mode 100644
index 0000000..c5fa5e0
--- /dev/null
+++ b/libbb/sysconf.c
@@ -0,0 +1,16 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Various system configuration helpers.
+ *
+ * Copyright (C) 2014 Bartosz Golaszewski <bartekgola@gmail.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+#include "libbb.h"
+
+#if defined _SC_ARG_MAX
+unsigned FAST_FUNC bb_arg_max(void)
+{
+ return sysconf(_SC_ARG_MAX);
+}
+#endif