Add a "fork" of musl as //fusl.

fusl/src/conf/fpathconf.c

Index: fusl/src/conf/fpathconf.c
diff --git a/fusl/src/conf/fpathconf.c b/fusl/src/conf/fpathconf.c
new file mode 100644
index 0000000000000000000000000000000000000000..8eb037e6b1173c155efb8f9d1f931703d8851d1b
--- /dev/null
+++ b/fusl/src/conf/fpathconf.c
@@ -0,0 +1,35 @@
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+
+long fpathconf(int fd, int name)
+{
+	static const short values[] = {
+		[_PC_LINK_MAX] = _POSIX_LINK_MAX,
+		[_PC_MAX_CANON] = _POSIX_MAX_CANON,
+		[_PC_MAX_INPUT] = _POSIX_MAX_INPUT,
+		[_PC_NAME_MAX] = NAME_MAX,
+		[_PC_PATH_MAX] = PATH_MAX,
+		[_PC_PIPE_BUF] = PIPE_BUF,
+		[_PC_CHOWN_RESTRICTED] = 1,
+		[_PC_NO_TRUNC] = 1,
+		[_PC_VDISABLE] = 0,
+		[_PC_SYNC_IO] = 1,
+		[_PC_ASYNC_IO] = -1,
+		[_PC_PRIO_IO] = -1,
+		[_PC_SOCK_MAXBUF] = -1,
+		[_PC_FILESIZEBITS] = FILESIZEBITS,
+		[_PC_REC_INCR_XFER_SIZE] = 4096,
+		[_PC_REC_MAX_XFER_SIZE] = 4096,
+		[_PC_REC_MIN_XFER_SIZE] = 4096,
+		[_PC_REC_XFER_ALIGN] = 4096,
+		[_PC_ALLOC_SIZE_MIN] = 4096,
+		[_PC_SYMLINK_MAX] = SYMLINK_MAX,
+		[_PC_2_SYMLINKS] = 1
+	};
+	if (name >= sizeof(values)/sizeof(values[0])) {
+		errno = EINVAL;
+		return -1;
+	}
+	return values[name];
+}