dlfcn: Combine functions for the same header into one file

Changes to existing code:
* Make explicit comparison against NULL.
* Adjust debug message for readability.

Signed-off-by: Samuel Holland <samuel@sholland.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/libgcompat/dlfcn.c b/libgcompat/dlfcn.c
new file mode 100644
index 0000000..f2eaa45
--- /dev/null
+++ b/libgcompat/dlfcn.c
@@ -0,0 +1,25 @@
+#include <dlfcn.h>  /* dlopen, dlsym */
+#include <stddef.h> /* NULL */
+#include <stdio.h>  /* fprintf */
+#include <stdlib.h> /* getenv */
+
+void *dlmopen(long lmid, const char *pathname, int mode)
+{
+	if (getenv("GLIBC_FAKE_DEBUG") != NULL) {
+		fprintf(stderr,
+		        "loading library %s was requested in namespace %ld",
+		        pathname, lmid);
+	}
+
+	return dlopen(pathname, mode);
+}
+
+void *dlvsym(void *handle, char *symbol, char *version)
+{
+	if (getenv("GLIBC_FAKE_DEBUG") != NULL) {
+		fprintf(stderr, "symbol %s with version %s is being redirected",
+		        symbol, version);
+	}
+
+	return dlsym(handle, symbol);
+}