Add support for pread/pwrite on windows. (#7827)

1 files changed, 14 insertions, 4 deletions

diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index 197eb8a802..50713e9d6c 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -147,8 +147,16 @@ typedef int clockid_t;
 #define open			rb_w32_uopen
 #define close(h)		rb_w32_close(h)
 #define fclose(f)		rb_w32_fclose(f)
-#define read(f, b, s)		rb_w32_read(f, b, s)
-#define write(f, b, s)		rb_w32_write(f, b, s)
+
+#define read(f, b, s) rb_w32_read(f, b, s, NULL)
+#define write(f, b, s) rb_w32_write(f, b, s, NULL)
+
+#define HAVE_PREAD
+#define pread(f, b, s, o) rb_w32_pread(f, b, s, o)
+
+#define HAVE_PWRITE
+#define pwrite(f, b, s, o) rb_w32_pwrite(f, b, s, o)
+
 #define getpid()		rb_w32_getpid()
 #undef HAVE_GETPPID
 #define HAVE_GETPPID 1
@@ -714,8 +722,10 @@ int  rb_w32_wopen(const WCHAR *, int, ...);
 int  rb_w32_close(int);
 int  rb_w32_fclose(FILE*);
 int  rb_w32_pipe(int[2]);
-ssize_t rb_w32_read(int, void *, size_t);
-ssize_t rb_w32_write(int, const void *, size_t);
+ssize_t rb_w32_read(int, void *, size_t, rb_off_t *offset);
+ssize_t rb_w32_write(int, const void *, size_t, rb_off_t *offset);
+ssize_t rb_w32_pread(int, void *, size_t, rb_off_t offset);
+ssize_t rb_w32_pwrite(int, const void *, size_t, rb_off_t offset);
 rb_off_t  rb_w32_lseek(int, rb_off_t, int);
 int  rb_w32_uutime(const char *, const struct utimbuf *);
 int  rb_w32_uutimes(const char *, const struct timeval *);