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+
+
+
+aarch64-linux-user master: inconsistent pwrite behaviour
+
+Hello,
+
+I am running aarch64-linux-user from master, commit 20d6c7312f1b812bb9c750f4087f69ac8485cc90
+
+And I've found the following inconsistent emulation of pwrite() call when buf==NULL and len=0.
+Minimal reproducible sample is the following:
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+/*
+ System                  | Result
+-------------------------+----------------
+ Native x86_64 4.12.14   | pwrite ret = 0
+ Native aarch64 4.4.159  | pwrite ret = 0
+ qemu-aarch64 at x86_64  | pwrite ret = -1
+   ( 20d6c7312f1b8 )     |
+*/
+
+int main(int argc, char** argv) {
+	int fd = open("test.dat", O_CREAT | O_RDWR, 0644);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+
+	int ret = fallocate(fd, 0, 0, 1000);
+	if (ret < 0) {
+		perror("fallocate");
+		return 1;
+	}
+
+	ssize_t ret_pwrite = pwrite(fd, NULL, 0, 0);
+	printf("pwrite ret = %ld\n", ret_pwrite);
+
+	close(fd);
+
+	return 0;
+}
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