fixup! [LibOS] Make handling of corruption more consistent (WIP)

Signed-off-by: g2flyer <[email protected]>

libos/test/fs/pf_tamper.c

@@ -0,0 +1,35 @@
+#include "common.h"
+
+static void read_complete_file(const char* path) {
+    int fd = open(path, O_RDONLY);
+    if (fd < 0) {
+        printf("ERROR: Failed to open input file %s: %s\n", path, strerror(errno));
+	return;
+    }
+
+    char buf[1024];
+    while (true) {
+        ssize_t ret = read(fd, buf, sizeof(buf));
+        if (ret < 0) {
+            if (errno == EAGAIN || errno == EINTR)
+                continue;
+            printf("ERROR: Failed to read file %s: %s\n", path, strerror(errno));
+	    return;
+        }
+        if (ret == 0)
+            break;
+    }
+
+    if (close(fd) != 0)
+        printf("ERROR: Failed to close file %s: %s\n", path, strerror(errno));
+}
+
+
+int main(int argc, char* argv[]) {
+    if (argc < 2)
+        fatal_error("Usage: %s <file_path>\n", argv[0]);
+
+    setup();
+    read_complete_file(argv[1]);
+    return 0;
+}