user/libc: preparation for dlmalloc port

1 files changed, 24 insertions, 0 deletions

diff --git a/src/user/lib/mman.c b/src/user/lib/mman.c
new file mode 100644
index 0000000..b41b8ff
--- /dev/null
+++ b/src/user/lib/mman.c
@@ -0,0 +1,24 @@
+/* mmap() emulation */
+#include <camellia/syscalls.h>
+#include <errno.h>
+#include <sys/mman.h>
+
+void *mmap(void *addr, size_t len, int prot, int flags, int fd, off_t off) {
+	(void)fd; (void) off;
+	if ((flags & MMAP_UNSUPPORTED) == MMAP_UNSUPPORTED ||
+		(prot & MMAP_UNSUPPORTED) == MMAP_UNSUPPORTED ||
+		!(flags & MAP_ANONYMOUS))
+	{
+		errno = ENOSYS;
+		return NULL;
+	}
+
+	void *p = _syscall_memflag(addr, len, MEMFLAG_FINDFREE | MEMFLAG_PRESENT);
+	if (!p) errno = ENOMEM;
+	return p;
+}
+
+int munmap(void *addr, size_t len) {
+	_syscall_memflag(addr, len, 0);
+	return 0;
+}