feat(stat): stat/mkdir/chmod and mode macros

src/stat/mkfifo.c

@@ -0,0 +1,25 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/stat.h>
+
+#include "../internal/syscall.h"
+#include "stat_impl.h"
+
+/*
+ * mkfifo/mkfifoat over SYS_mknodat with the type bits fixed to S_IFIFO:
+ * creating a FIFO is mknodat(..., mode | S_IFIFO, dev = 0). POSIX defines
+ * mkfifo with no device argument, so the dev slot is always 0 here.
+ */
+int
+mkfifoat(int fd, const char *path, mode_t mode)
+{
+    return syscall_ret(__syscall4(SYS_mknodat, fd, (long)path, (long)(mode | S_IFIFO), 0));
+}
+
+int
+mkfifo(const char *path, mode_t mode)
+{
+    return mkfifoat(VLIBC_STAT_AT_FDCWD, path, mode);
+}