perf: fix musl compatibility

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48067

1 files changed, 62 insertions, 0 deletions

diff --git a/package/devel/perf/musl-compat.h b/package/devel/perf/musl-compat.h
new file mode 100644
index 0000000000..ecfbec6a29
--- /dev/null
+++ b/package/devel/perf/musl-compat.h
@@ -0,0 +1,62 @@
+#ifndef __PERF_MUSL_COMPAT_H
+#define __PERF_MUSL_COMPAT_H
+
+#include <sys/ioctl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <syscall.h>
+#include <sched.h>
+
+#undef _IOWR
+#undef _IOR
+#undef _IOW
+#undef _IOC
+#undef _IO
+
+/* Change XSI compliant version into GNU extension hackery */
+#define strerror_r(err, buf, buflen) \
+	(strerror_r(err, buf, buflen) ? NULL : buf)
+
+#define _SC_LEVEL1_DCACHE_LINESIZE -1
+
+static inline long sysconf_wrap(int name)
+{
+	FILE *f;
+	int val;
+
+	switch (name) {
+	case _SC_LEVEL1_DCACHE_LINESIZE:
+		f = fopen("/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size", "r");
+		if (!f)
+			return 0;
+
+		if (fscanf(f, "%d", &val) != 1)
+			return 0;
+
+		fclose(f);
+		return val;
+	default:
+		return sysconf(name);
+	}
+}
+
+#define sysconf(_n) sysconf_wrap(_n)
+
+static inline int compat_sched_getcpu(void)
+{
+#ifdef __NR_getcpu
+	unsigned int val;
+
+	if (syscall(__NR_getcpu, &val))
+		return -1;
+
+	return val;
+#else
+	return -1;
+#endif
+}
+
+#define sched_getcpu compat_sched_getcpu
+
+#endif