From c43a9d18cdbcf47335ddac2c5432b0c0805fa83e Mon Sep 17 00:00:00 2001
From: Hariharan Devarajan <mani.hariharan@gmail.com>
Date: Tue, 22 Aug 2023 22:49:17 -0700
Subject: [PATCH] changed stdio calls to syscalls to make it non-interceptable.

---
 src/dlio_profiler/writer/base_writer.h | 39 ++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/dlio_profiler/writer/base_writer.h b/src/dlio_profiler/writer/base_writer.h
index 2a34c839..61e904b7 100644
--- a/src/dlio_profiler/writer/base_writer.h
+++ b/src/dlio_profiler/writer/base_writer.h
@@ -22,6 +22,45 @@ namespace dlio_profiler {
     protected:
         bool throw_error;
         std::string filename;
+        int dlp_open(const char *pathname, int flags, ...) {
+          mode_t mode;
+          va_list args;
+          long result;
+
+          va_start(args, flags);
+          if (flags & O_CREAT) {
+            mode = va_arg(args, mode_t);
+          }
+          else {
+            mode = 0;
+          }
+          va_end(args);
+#if defined(SYS_open)
+          result = syscall(SYS_open, pathname, flags, mode);
+#else
+          result = syscall(SYS_openat, AT_FDCWD, pathname, flags, mode);
+#endif
+
+          if (result >= 0)
+            return (int) result;
+          return -1;
+        }
+
+        ssize_t dlp_write(int fd, const void *buf, size_t count) {
+          return syscall(SYS_write, fd, buf, count);
+        }
+
+        ssize_t dlp_read(int fd, void *buf, size_t count) {
+          return syscall(SYS_read, fd, buf, count);
+        }
+
+        int dlp_close(int fd) {
+          return syscall(SYS_close, fd);
+        }
+
+        int dlp_fsync(int fd) {
+          return syscall(SYS_fsync, fd);
+        }
     public:
         virtual void initialize(char *filename, bool throw_error) = 0;