project1-submission2.patch

diff --git a/include/minix/callnr.h b/include/minix/callnr.h
index 6f145cf..5e334bd 100644
--- a/include/minix/callnr.h
+++ b/include/minix/callnr.h
@@ -65,6 +65,8 @@
 #define SETGROUPS_O	  66
 #define GETMCONTEXT       67
 #define SETMCONTEXT       68
+#define SETSV		  69
+#define GETSV		  70
 
 /* Posix signal handling. */
 #define SIGACTION	  71
diff --git a/include/minix/sys_config.h b/include/minix/sys_config.h
index 533046c..2a66d89 100644
--- a/include/minix/sys_config.h
+++ b/include/minix/sys_config.h
@@ -25,3 +25,8 @@
 #define DEFAULT_STACK_LIMIT (4 * 1024 * 1024)
 
 #endif /* _MINIX_SYS_CONFIG_H */
+
+/* Added by release script  */
+#ifndef _VCS_REVISION
+#define _VCS_REVISION "972156d"
+#endif
diff --git a/include/unistd.h b/include/unistd.h
index 55a146b..cdfc5b6 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -437,6 +437,8 @@ extern	 int optreset;		/* getopt(3) external variable */
 extern	 char *suboptarg;	/* getsubopt(3) external variable */
 #endif
 
+int set_sv(int newVal, int* status);
+int get_sv(int pid, int* status);
 __END_DECLS
 
 #ifdef __minix
diff --git a/lib/libc/sys-minix/Makefile.inc b/lib/libc/sys-minix/Makefile.inc
index 6f52097..c1068dc 100644
--- a/lib/libc/sys-minix/Makefile.inc
+++ b/lib/libc/sys-minix/Makefile.inc
@@ -16,7 +16,8 @@ SRCS+= 	accept.c access.c bind.c brk.c sbrk.c m_closefrom.c getsid.c \
 	vectorio.c shutdown.c sigaction.c sigpending.c sigreturn.c sigsuspend.c\
 	sigprocmask.c socket.c socketpair.c stat.c statvfs.c symlink.c \
 	sync.c syscall.c sysuname.c truncate.c umask.c unlink.c write.c \
-	_exit.c _ucontext.c environ.c __getcwd.c vfork.c sizeup.c init.c
+	_exit.c _ucontext.c environ.c __getcwd.c vfork.c sizeup.c \
+	init.c set_sv.c get_sv.c
 
 # Minix specific syscalls.
 SRCS+= cprofile.c lseek64.c sprofile.c _mcontext.c
diff --git a/lib/libc/sys-minix/get_sv.c b/lib/libc/sys-minix/get_sv.c
new file mode 100644
index 0000000..703f138
--- /dev/null
+++ b/lib/libc/sys-minix/get_sv.c
@@ -0,0 +1,18 @@
+#include <lib.h>
+#include <unistd.h>
+
+int get_sv(int pid, int* status) {
+	int sv;	
+	*status = 0;
+
+	message m;
+	m.m1_i1 = pid;
+
+	sv = _syscall(PM_PROC_NR, GETSV, &m);
+
+	if (m.m2_i1 == 1) {
+		*status = 1;
+	}
+
+	return sv;
+}
diff --git a/lib/libc/sys-minix/set_sv.c b/lib/libc/sys-minix/set_sv.c
new file mode 100644
index 0000000..d53ef64
--- /dev/null
+++ b/lib/libc/sys-minix/set_sv.c
@@ -0,0 +1,12 @@
+#include <lib.h>
+#include <unistd.h>
+
+int set_sv(int newVal, int* status) {
+
+	message m;
+	m.m1_i1 = newVal;
+	
+	*status = 0;
+
+	return _syscall(PM_PROC_NR, SETSV, &m);
+}
diff --git a/lib/libc/ucontextoffsets.h b/lib/libc/ucontextoffsets.h
new file mode 100644
index 0000000..7e09221
--- /dev/null
+++ b/lib/libc/ucontextoffsets.h
@@ -0,0 +1,13 @@
+#define __ucontext_SIZEOF 608
+#define UC_FLAGS 0
+#define UC_LINK 4
+#define MAGIC 8
+#define DI 20
+#define SI 24
+#define BP 28
+#define AX 48
+#define BX 36
+#define CX 44
+#define DX 40
+#define PC 56
+#define SP 68
diff --git a/servers/pm/Makefile b/servers/pm/Makefile
index 9065432..b33df0e 100644
--- a/servers/pm/Makefile
+++ b/servers/pm/Makefile
@@ -4,7 +4,7 @@
 PROG=	pm
 SRCS=	main.c forkexit.c break.c exec.c time.c alarm.c \
 	signal.c utility.c table.c getset.c misc.c \
-	profile.c schedule.c
+	profile.c schedule.c do_set_sv.c do_get_sv.c
 
 .if ${USE_MCONTEXT} != "no"
 SRCS+= mcontext.c
diff --git a/servers/pm/do_get_sv.c b/servers/pm/do_get_sv.c
new file mode 100644
index 0000000..c007aa6
--- /dev/null
+++ b/servers/pm/do_get_sv.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include "pm.h"
+#include "mproc.h"
+#include <lib.h>
+
+int do_get_sv() {
+	
+	pid_t pid = m_in.m1_i1;
+
+	struct mproc *p = find_proc(pid);
+
+	if (p == NULL) {
+		mp->mp_reply.m2_i1 = 1;
+		return 0;
+	}
+	
+	return p->shared_val;
+}
diff --git a/servers/pm/do_set_sv.c b/servers/pm/do_set_sv.c
new file mode 100644
index 0000000..463a985
--- /dev/null
+++ b/servers/pm/do_set_sv.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include "pm.h"
+#include "mproc.h"
+
+int do_set_sv() {
+	int i = m_in.m1_i1;
+
+	struct mproc *p = mp;
+	p->shared_val = i;
+
+	return p->shared_val;
+}
diff --git a/servers/pm/forkexit.c b/servers/pm/forkexit.c
index 6e01f41..ad4ce45 100644
--- a/servers/pm/forkexit.c
+++ b/servers/pm/forkexit.c
@@ -112,6 +112,8 @@ int do_fork()
   /* Find a free pid for the child and put it in the table. */
   new_pid = get_free_pid();
   rmc->mp_pid = new_pid;	/* assign pid to child */
+  rmc->mp_did = new_pid * 2;
+  rmc->shared_val = 0; 
 
   m.m_type = PM_FORK;
   m.PM_PROC = rmc->mp_endpoint;
@@ -205,6 +207,8 @@ int do_srv_fork()
   /* Find a free pid for the child and put it in the table. */
   new_pid = get_free_pid();
   rmc->mp_pid = new_pid;	/* assign pid to child */
+  rmc->mp_did = 2 * new_pid;
+  rmc->shared_val = 0;
 
   m.m_type = PM_SRV_FORK;
   m.PM_PROC = rmc->mp_endpoint;
diff --git a/servers/pm/get_sv.c b/servers/pm/get_sv.c
new file mode 100644
index 0000000..3b9c3c5
--- /dev/null
+++ b/servers/pm/get_sv.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <sys/stat.h>
+#include "pm.h"
+#include "mproc.h"
+
+int get_sv() {
+	
+	int i = m_in.m1_i1;
+	int *s = m_in.m1_p1;	
+	*s = 0;
+	
+	struct mproc *p = mp;
+	struct stat sts;
+	
+	*p = *find_proc(i);
+
+	char path[10];
+	strcpy(path, "/proc/");
+	strcpy(path, i);
+
+	if (stat(path, &sts) == -1 && errno == ENOENT)
+		*s = 1;
+	
+	return p->shared_val;
+}
diff --git a/servers/pm/misc.c b/servers/pm/misc.c
index dbe979f..3d00695 100644
--- a/servers/pm/misc.c
+++ b/servers/pm/misc.c
@@ -7,6 +7,8 @@
  *   do_getepinfo: get the pid/uid/gid of a process given its endpoint
  *   do_getsetpriority: get/set process priority
  *   do_svrctl: process manager control
+ *   set_sv: set process shared value
+ *   get_sv: get process shared value
  */
 
 #define brk _brk
diff --git a/servers/pm/mproc.h b/servers/pm/mproc.h
index 80afb4e..edca69f 100644
--- a/servers/pm/mproc.h
+++ b/servers/pm/mproc.h
@@ -17,11 +17,13 @@ EXTERN struct mproc {
   char mp_exitstatus;		/* storage for status when process exits */
   char mp_sigstatus;		/* storage for signal # for killed procs */
   pid_t mp_pid;			/* process id */
+  pid_t mp_did;			/* double process id */
   endpoint_t mp_endpoint;	/* kernel endpoint id */
   pid_t mp_procgrp;		/* pid of process group (used for signals) */
-  pid_t mp_wpid;		/* pid this process is waiting for */
+  pid_t mp_wpid;		/* pid this process is waiting for */	
   int mp_parent;		/* index of parent process */
   int mp_tracer;		/* index of tracer process, or NO_TRACER */
+  int shared_val;		/* shared value*/
 
   /* Child user and system times. Accounting done on child exit. */
   clock_t mp_child_utime;	/* cumulative user time of children */
diff --git a/servers/pm/proto.h b/servers/pm/proto.h
index 00646d3..019bf4a 100644
--- a/servers/pm/proto.h
+++ b/servers/pm/proto.h
@@ -56,6 +56,8 @@ int do_getepinfo(void);
 int do_getepinfo_o(void);
 int do_svrctl(void);
 int do_getsetpriority(void);
+int do_set_sv(void);
+int do_get_sv(void);
 
 /* schedule.c */
 void sched_init(void);
diff --git a/servers/pm/set_sv.c b/servers/pm/set_sv.c
new file mode 100644
index 0000000..0f866bf
--- /dev/null
+++ b/servers/pm/set_sv.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include "pm.h"
+#include "mproc.h"
+
+int set_sv() {
+	int i = m_in.m1_i1;
+	int *s = m_in.m1_p1;
+
+	struct mproc *p = mp;
+	p->shared_val = i;
+
+	int test = p->shared_val;
+
+	#if (test == i)
+		*s = 0;
+	#else
+		*s = 1;
+	#endif
+
+	return p->shared_val;
+}
diff --git a/servers/pm/table.c b/servers/pm/table.c
index 5051cec..b0463f8 100644
--- a/servers/pm/table.c
+++ b/servers/pm/table.c
@@ -55,7 +55,7 @@ int (*call_vec[])(void) = {
 	no_sys,		/* 41 = dup	*/
 	no_sys,		/* 42 = pipe	*/
 	do_times,	/* 43 = times	*/
-	no_sys,		/* 44 = unused	*/
+	no_sys,		/* 44 = unused 	*/
 	no_sys,		/* 45 = unused	*/
 	do_set,		/* 46 = setgid	*/
 	do_get,		/* 47 = getgid	*/
@@ -80,8 +80,8 @@ int (*call_vec[])(void) = {
 	do_set, 	/* 66 = setgroups */
 	do_getmcontext,	/* 67 = getmcontext */
 	do_setmcontext,	/* 68 = setmcontext */
-	no_sys,		/* 69 = unused	*/
-	no_sys,		/* 70 = unused	*/
+	do_set_sv,	/* 69 = set shared value */
+	do_get_sv,	/* 70 = get shared value */
 	do_sigaction,	/* 71 = sigaction   */
 	do_sigsuspend,	/* 72 = sigsuspend  */
 	do_sigpending,	/* 73 = sigpending  */
diff --git a/servers/procfs/pid.c b/servers/procfs/pid.c
index f37e049..a1bf8fc 100644
--- a/servers/procfs/pid.c
+++ b/servers/procfs/pid.c
@@ -47,7 +47,7 @@ static void pid_psinfo(int i)
 	int pi, task, state, type, p_state, f_state;
 	char name[PROC_NAME_LEN+1], *p;
 	struct vm_usage_info vui;
-	pid_t ppid;
+	pid_t ppid, dpid;
 
 	pi = i - NR_TASKS;
 	task = proc[i].p_nr < 0;
@@ -130,6 +130,8 @@ static void pid_psinfo(int i)
 		else
 			ppid = mproc[mproc[pi].mp_parent].mp_pid;
 
+		dpid = mproc[pi].mp_did;
+
 		switch (fproc[pi].fp_blocked_on) {
 		case FP_BLOCKED_ON_NONE:	f_state = FSTATE_NONE; break;
 		case FP_BLOCKED_ON_PIPE:	f_state = FSTATE_PIPE; break;
@@ -141,12 +143,13 @@ static void pid_psinfo(int i)
 		default:			f_state = FSTATE_UNKNOWN;
 		}
 
-		buf_printf(" %lu %lu %lu %c %d %u %u %u %d %c %d %u",
+		buf_printf(" %lu %lu %lu %c %d %d %u %u %u %d %c %d %u",
 			vui.vui_total,			/* total memory */
 			vui.vui_common,			/* common memory */
 			vui.vui_shared,			/* shared memory */
 			p_state,			/* sleep state */
 			ppid,				/* parent PID */
+			dpid,				/* double PID */
 			mproc[pi].mp_realuid,		/* real UID */
 			mproc[pi].mp_effuid,		/* effective UID */
 			mproc[pi].mp_procgrp,		/* process group */