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Date:   Thu, 21 Dec 2017 11:11:31 +1030
From:   Joel Stanley <>
To:     Linus Walleij <>
Subject: [PATCH] tools/gpio: Fix build error with musl libc

The GPIO tools build fails when using a buildroot toolchain that uses musl
as it's C library:

arm-broomstick-linux-musleabi-gcc -Wp,-MD,./.gpio-event-mon.o.d \
 -Wp,-MT,gpio-event-mon.o -O2 -Wall -g -D_GNU_SOURCE \
 -Iinclude -D"BUILD_STR(s)=#s" -c -o gpio-event-mon.o gpio-event-mon.c
gpio-event-mon.c:30:6: error: unknown type name ‘u_int32_t’; did you mean ‘uint32_t’?
      u_int32_t handleflags,

The glibc headers installed on my laptop include sys/types.h in
unistd.h, but it appears that musl does not.

Fixes: 97f69747d8b1 ("tools/gpio: add the gpio-event-mon tool")
Signed-off-by: Joel Stanley <>
 tools/gpio/gpio-event-mon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c
index 1c14c2595158..4b36323ea64b 100644
--- a/tools/gpio/gpio-event-mon.c
+++ b/tools/gpio/gpio-event-mon.c
@@ -23,6 +23,7 @@
 #include <getopt.h>
 #include <inttypes.h>
 #include <sys/ioctl.h>
+#include <sys/types.h>
 #include <linux/gpio.h>
 int monitor_device(const char *device_name,

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