remove sys_types header from signal header includes

src/header/signal/cbindgen.toml

@@ -6,11 +6,19 @@
 # - "pid_t As described in <sys/types.h>."
 # - "The <signal.h> header shall define the pthread_attr_t type as described in <sys/types.h>."
 # - "Inclusion of the <signal.h> header may make visible all symbols from the <time.h> header."
-sys_includes = ["sys/types.h"]
+#
+# Cycle warning:
+# POSIX states signal.h may include time.h and time.h may include signal.h.
+# To prevent a cycle between both headers we only import the needed types through bits.
+sys_includes = []
 include_guard = "_RELIBC_SIGNAL_H"
 after_includes = """
+#include <bits/pid-t.h>    // for pid_t from sys/types.h
+#include <bits/pthread.h>  // for pthread_t and pthread_attr_t from sys/types.h
 #include <bits/sigset-t.h> // for sigset_t
+#include <bits/size-t.h>   // for size_t from sys/types.h
 #include <bits/timespec.h> // for timespec from time.h
+#include <bits/uid-t.h>    // for uid_t from sys/types.h
 
 #define SIG_DFL ((void (*)(int))0)
 #define SIG_IGN ((void (*)(int))1)

src/header/signal/mod.rs

@@ -34,9 +34,13 @@ pub mod sys;
 
 type SigSet = BitSet<[u64; 1]>;
 
+/// cbindgen:ignore
 pub(crate) const SIG_DFL: usize = 0;
+/// cbindgen:ignore
 pub(crate) const SIG_IGN: usize = 1;
+/// cbindgen:ignore
 pub(crate) const SIG_ERR: isize = -1;
+/// cbindgen:ignore
 pub(crate) const SIG_HOLD: isize = 2;
 
 pub const SIG_BLOCK: c_int = 0;