libc: add sched.h and signal.h headers

lib/libc/include/sched.h

@@ -0,0 +1,14 @@
+#ifndef SCHED_H_
+#define SCHED_H_
+
+#include <time.h>
+
+struct sched_param {
+	int sched_priority;
+	int sched_ss_low_priority;
+	struct timespec sched_ss_repl_period;
+	struct timespec sched_ss_init_budget;
+	int sched_ss_max_repl;
+};
+
+#endif

lib/libc/include/signal.h

@@ -0,0 +1,57 @@
+#ifndef SIGNAL_H_
+#define SIGNAL_H_
+
+#define SIG_IGN      0
+#define SIG_HOLD     1
+#define SIG_ERR      2
+#define SIG_DFL      3
+
+#define SIGEV_NONE   0
+#define SIGEV_SIGNAL 1
+#define SIGEV_THREAD 2
+
+#define SIGABRT      1
+#define SIGALRM      2
+#define SIGBUS       3
+#define SIGCHLD      4
+#define SIGCONT      5
+#define SIGFPE       6
+#define SIGHUP       7
+#define SIGILL       8
+#define SIGINT       9
+#define SIGKILL      10
+#define SIGPIPE      11
+#define SIGQUIT      12
+#define SIGSEGV      13
+#define SIGSTOP      14
+#define SIGTERM      15
+#define SIGTSTP      16
+#define SIGTTIN      17
+#define SIGTTOU      18
+#define SIGUSR1      19
+#define SIGUSR2      20
+#define SIGPOLL      21
+#define SIGPROF      22
+#define SIGSYS       23
+#define SIGTRAP      24
+#define SIGURG       25
+#define SIGVTALRM    26
+#define SIGXCPU      27
+#define SIGXFSZ      28
+
+typedef long long sigset_t;
+
+union sigval {
+	int sival_int;
+	void *sival_ptr;
+};
+
+struct sigevent {
+	int sigev_notify;
+	int sigev_signo;
+	union sigval sigev_value;
+	void (*sigev_notify_function)(union sigval);
+	/* TODO pthread_attr_t sigev_notify_attributes */
+};
+
+#endif