Kernel/LibC: Add signals and support for custom signal handlers to processes.

1 files changed, 46 insertions, 0 deletions

diff --git a/includes/signal.h b/includes/signal.h
new file mode 100644
index 0000000..3de9998
--- /dev/null
+++ b/includes/signal.h
@@ -0,0 +1,46 @@
+#ifndef SIGNAL_H
+#define SIGNAL_H
+#include <sys/types.h>
+#define SIGHUP 0
+#define SIGINT 1
+#define SIGWINCH 2
+#define SIGQUIT 3
+#define SIG_IGN 4
+typedef int pid_t;
+typedef int uid_t;
+typedef int sigset_t;
+
+union sigval {
+  int sival_int;   // Integer signal value.
+  void *sival_ptr; // Pointer signal value.
+};
+
+struct siginfo {
+  int si_signo;          //  Signal number.
+  int si_code;           //   Signal code.
+  int si_errno;          //  If non-zero, an errno value associated with
+                         // this signal, as described in <errno.h>.
+  pid_t si_pid;          //    Sending process ID.
+  uid_t si_uid;          //    Real user ID of sending process.
+  void *si_addr;         //   Address of faulting instruction.
+  int si_status;         // Exit value or signal.
+  long si_band;          //   Band event for SIGPOLL.
+  union sigval si_value; //  Signal value.
+};
+
+typedef struct siginfo siginfo_t;
+
+int kill(pid_t pid, int sig);
+
+struct sigaction {
+  void (*sa_handler)(int); // Pointer to a signal-catching function or one of
+                           // the macros SIG_IGN or SIG_DFL.
+  sigset_t sa_mask; // Additional set of signals to be blocked during execution
+                    // of signal-catching function.
+  int sa_flags;     // Special flags to affect behavior of signal.
+  void (*sa_sigaction)(int, siginfo_t *,
+                       void *); // Pointer to a signal-catching function.
+};
+
+int sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
+#endif // SIGNAL_H