job control: sessions and process groups

kernel-src/include/kernel/jobctl.h

@@ -0,0 +1,17 @@
+#ifndef _JOBCTL_H
+#define _JOBCTL_H
+
+#include <kernel/scheduler.h>
+
+int jobctl_newsession(proc_t *proc);
+int jobctl_newgroup(proc_t *proc);
+int jobctl_changegroup(proc_t *proc, proc_t *group);
+void jobctl_detach(proc_t *);
+void jobctl_addproc(proc_t *parent, proc_t *proc);
+void jobctl_procremove(proc_t *proc);
+pid_t jobctl_getpgid(proc_t *proc);
+pid_t jobctl_getsid(proc_t *proc);
+void jobctl_setctty(proc_t *proc, void *ctty);
+void *jobctl_getctty(proc_t *proc);
+
+#endif

kernel-src/include/kernel/scheduler.h

@@ -74,6 +74,29 @@ typedef struct proc_t {
 	semaphore_t waitsem;
 	spinlock_t exiting;
 	bool nomorethreads;
+
+	spinlock_t jobctllock;
+	struct {
+		// NULL if this process is leader
+		struct proc_t *leader;
+
+		// these are only applicable if the process is leader
+		struct proc_t *foreground; // process group leader, NULL if self
+		void *controllingtty;
+		int processcount; // refcount
+	} session;
+
+	struct {
+		// NULL if this process is leader
+		struct proc_t *leader;
+		// linked list
+		struct proc_t *nextmember;
+		struct proc_t *previousmember;
+
+		// these are only applicable if the process is leader
+		spinlock_t lock; // protects the linked list
+		int processcount; // refcount
+	} pgrp;
 } proc_t;
 
 #include <arch/cpu.h>

kernel-src/include/kernel/tty.h

@@ -5,6 +5,7 @@
 #include <termios.h>
 #include <kernel/poll.h>
 #include <ringbuffer.h>
+#include <kernel/vfs.h>
 
 #define DEVICE_BUFFER_SIZE 512
 #define READ_BUFFER_SIZE 4096
@@ -23,6 +24,7 @@ typedef struct {
 	ttydevicewritefn_t writetodevice;
 	int minor;
 	winsize_t winsize;
+	vnode_t *mastervnode;
 } tty_t;
 
 void tty_init();

kernel-src/include/kernel/vfs.h

@@ -55,6 +55,7 @@ typedef struct vfs_t {
 #define V_FFLAGS_NONBLOCKING 4
 #define V_FFLAGS_SHARED 8
 #define V_FFLAGS_EXEC 16
+#define V_FFLAGS_NOCTTY 32
 
 typedef struct vnode_t {
 	struct vops_t *ops;