nocache.patch

nocache.patch

commit 9519ee51ecd775e4beaf7625c79207e78df9e0d7
gpg: Signature made Mon 06 May 2019 09:50:33 PM PDT
gpg:                using RSA key F6CC1F4DF325EACBBE2532481F299543498470BA
gpg:                issuer "justincapella@gmail.com"
gpg: Good signature from "Justin Capella <justincapella@gmail.com>" [ultimate]
Author: Justin Capella <justincapella@gmail.com>
Date:   Mon May 6 21:50:33 2019 -0700

    opendir

diff --git a/nocache.c b/nocache.c
index 84fd0e1..78c5049 100644
--- a/nocache.c
+++ b/nocache.c
@@ -26,6 +26,7 @@ static void handle_stdout(void);
 static void store_pageinfo(int fd);
 static void free_unclaimed_pages(int fd);
 
+int opendir(const char *dirname);
 int open(const char *pathname, int flags, mode_t mode);
 int open64(const char *pathname, int flags, mode_t mode);
 int creat(const char *pathname, int flags, mode_t mode);
@@ -41,6 +42,7 @@ FILE *fopen(const char *path, const char *mode);
 FILE *fopen64(const char *path, const char *mode);
 int fclose(FILE *fp);
 
+int (*_original_opendir)(const char *dirname);
 int (*_original_open)(const char *pathname, int flags, mode_t mode);
 int (*_original_open64)(const char *pathname, int flags, mode_t mode);
 int (*_original_creat)(const char *pathname, int flags, mode_t mode);
@@ -120,6 +122,7 @@ static void init(void)
     fds = malloc(max_fds * sizeof(*fds));
     assert(fds != NULL);
 
+    _original_opendir = (int (*)(const char *,)) dlsym(RTLD_NEXT, "opendir");
     _original_open = (int (*)(const char *, int, mode_t)) dlsym(RTLD_NEXT, "open");
     _original_open64 = (int (*)(const char *, int, mode_t)) dlsym(RTLD_NEXT, "open64");
     _original_creat = (int (*)(const char *, int, mode_t)) dlsym(RTLD_NEXT, "creat");
@@ -214,6 +217,22 @@ static void destroy(void)
     pthread_mutex_unlock(&fds_iter_lock);
 }
 
+int opendir(const char *dirname)
+{
+    int fd;
+
+    if(!_original_opendir)
+        _original_opendir = (int (*)(const char *)) dlsym(RTLD_NEXT, "opendir");
+    assert(_original_opendir != NULL);
+
+    if((fd = _original_opendir(dirname)) != NULL) {
+        DEBUG("opendir(dirname=%s) = %d\n",
+            dirname, fd);
+        store_pageinfo(fd);
+    }
+    return fd;
+}
+
 int open(const char *pathname, int flags, mode_t mode)
 {
     int fd;