outline <dlfcn.h>

9 files changed, 104 insertions, 0 deletions

diff --git a/src/dlfcn/RTLD_GLOBAL.h b/src/dlfcn/RTLD_GLOBAL.h
new file mode 100644
index 00000000..d9dee8b2
--- /dev/null
+++ b/src/dlfcn/RTLD_GLOBAL.h
@@ -0,0 +1,5 @@
+#define RTLD_GLOBAL                                                       (1<<2)
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/RTLD_LAZY.h b/src/dlfcn/RTLD_LAZY.h
new file mode 100644
index 00000000..f123753b
--- /dev/null
+++ b/src/dlfcn/RTLD_LAZY.h
@@ -0,0 +1,5 @@
+#define RTLD_LAZY                                                         (1<<0)
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/RTLD_LOCAL.h b/src/dlfcn/RTLD_LOCAL.h
new file mode 100644
index 00000000..817d3adf
--- /dev/null
+++ b/src/dlfcn/RTLD_LOCAL.h
@@ -0,0 +1,5 @@
+#define RTLD_LOCAL                                                        (1<<3)
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/RTLD_NOW.h b/src/dlfcn/RTLD_NOW.h
new file mode 100644
index 00000000..91b98afb
--- /dev/null
+++ b/src/dlfcn/RTLD_NOW.h
@@ -0,0 +1,5 @@
+#define RTLD_NOW                                                          (1<<1)
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/_dlfcn.h b/src/dlfcn/_dlfcn.h
new file mode 100644
index 00000000..fd5e30d0
--- /dev/null
+++ b/src/dlfcn/_dlfcn.h
@@ -0,0 +1,12 @@
+#ifndef ___DLFCN_H__
+#define ___DLFCN_H__
+
+#include <stddef.h>
+
+struct dlhandle {
+	void *base;
+	size_t size;
+	int fd;
+};
+
+#endif
diff --git a/src/dlfcn/dlclose.c b/src/dlfcn/dlclose.c
new file mode 100644
index 00000000..cfe43112
--- /dev/null
+++ b/src/dlfcn/dlclose.c
@@ -0,0 +1,13 @@
+#include <dlfcn.h>
+#include "_dlfcn.h"
+
+int dlclose(void *handle)
+{
+	struct dlhandle *h = handle;
+	munmap(h->base, h->size);
+	close(h->fd);
+}
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/dlerror.c b/src/dlfcn/dlerror.c
new file mode 100644
index 00000000..fb1dc0e6
--- /dev/null
+++ b/src/dlfcn/dlerror.c
@@ -0,0 +1,12 @@
+#include <dlfcn.h>
+#include "_dlfcn.h"
+
+char *dlerror(void)
+{
+	extern char *__dlerror;
+	return __dlerror;
+}
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/dlopen.c b/src/dlfcn/dlopen.c
new file mode 100644
index 00000000..f67e51ff
--- /dev/null
+++ b/src/dlfcn/dlopen.c
@@ -0,0 +1,34 @@
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include "_dlfcn.h"
+
+void *dlopen(const char *file, int mode)
+{
+	if ((mode & (RTLD_LAZY | RTLD_NOW)) == (RTLD_LAZY | RTLD_NOW)) {
+		return NULL;
+	}
+
+	if ((mode & (RTLD_GLOBAL | RTLD_LOCAL)) == (RTLD_GLOBAL | RTLD_LOCAL)) {
+		return NULL;
+	}
+
+	struct dlhandle *h = malloc(sizeof(*h));
+	if (h == NULL) {
+		return NULL;
+	}
+
+	h->fd = open(file, O_RDONLY | O_EXEC);
+	if (h->fd == -1) {
+		free(h);
+		return NULL;
+	}
+
+	/* map and verify file header */
+
+	return h;
+}
+
+/*
+XOPEN(500)
+*/
diff --git a/src/dlfcn/dlsym.c b/src/dlfcn/dlsym.c
new file mode 100644
index 00000000..1648fdbc
--- /dev/null
+++ b/src/dlfcn/dlsym.c
@@ -0,0 +1,13 @@
+#include <dlfcn.h>
+#include "_dlfcn.h"
+
+void *dlsym(void *restrict handle, const char *restrict name)
+{
+	struct dlhandle *h = handle;
+	(void)name;
+	return h;
+}
+
+/*
+XOPEN(500)
+*/