Import of Linus's Linux 1.1.68

1 files changed, 97 insertions, 0 deletions

diff --git a/include/linux/sem.h b/include/linux/sem.h
new file mode 100644
index 000000000..52189879b
--- /dev/null
+++ b/include/linux/sem.h
@@ -0,0 +1,97 @@
+#ifndef _LINUX_SEM_H
+#define _LINUX_SEM_H
+#include <linux/ipc.h>
+
+/* semop flags */
+#define SEM_UNDO        010000  /* undo the operation on exit */
+
+/* semctl Command Definitions. */
+#define GETPID  11       /* get sempid */
+#define GETVAL  12       /* get semval */
+#define GETALL  13       /* get all semval's */
+#define GETNCNT 14       /* get semncnt */
+#define GETZCNT 15       /* get semzcnt */
+#define SETVAL  16       /* set semval */
+#define SETALL  17       /* set all semval's */
+
+/* One semid data structure for each set of semaphores in the system. */
+struct semid_ds {
+  struct ipc_perm sem_perm;       /* permissions .. see ipc.h */
+  time_t          sem_otime;      /* last semop time */
+  time_t          sem_ctime;      /* last change time */
+  struct sem      *sem_base;      /* ptr to first semaphore in array */
+  struct wait_queue *eventn;
+  struct wait_queue *eventz;
+  struct sem_undo  *undo;	  /* undo requests on this array */
+  ushort          sem_nsems;      /* no. of semaphores in array */
+};
+
+/* semop system calls takes an array of these. */
+struct sembuf {
+  ushort  sem_num;        /* semaphore index in array */
+  short   sem_op;         /* semaphore operation */
+  short   sem_flg;        /* operation flags */
+};
+
+/* arg for semctl system calls. */
+union semun {
+  int val;			/* value for SETVAL */
+  struct semid_ds *buf;		/* buffer for IPC_STAT & IPC_SET */
+  ushort *array;		/* array for GETALL & SETALL */
+  struct seminfo *__buf;	/* buffer for IPC_INFO */
+  void *__pad;
+};
+
+struct  seminfo {
+    int semmap; 
+    int semmni; 
+    int semmns; 
+    int semmnu; 
+    int semmsl; 
+    int semopm; 
+    int semume; 
+    int semusz; 
+    int semvmx; 
+    int semaem; 
+};
+
+#define SEMMNI  128             /* ?  max # of semaphore identifiers */
+#define SEMMSL  32              /* <= 512 max num of semaphores per id */
+#define SEMMNS  (SEMMNI*SEMMSL) /* ? max # of semaphores in system */
+#define SEMOPM  32	        /* ~ 100 max num of ops per semop call */
+#define SEMVMX  32767           /* semaphore maximum value */
+
+/* unused */
+#define SEMUME  SEMOPM          /* max num of undo entries per process */
+#define SEMMNU  SEMMNS          /* num of undo structures system wide */
+#define SEMAEM  (SEMVMX >> 1)   /* adjust on exit max value */
+#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
+#define SEMUSZ  20		/* sizeof struct sem_undo */ 
+
+#ifdef __KERNEL__
+
+/* One semaphore structure for each semaphore in the system. */
+struct sem {
+  short   sempid;         /* pid of last operation */
+  ushort  semval;         /* current value */
+  ushort  semncnt;        /* num procs awaiting increase in semval */
+  ushort  semzcnt;        /* num procs awaiting semval = 0 */
+};
+
+/* ipcs ctl cmds */
+#define SEM_STAT 18	
+#define SEM_INFO 19
+
+/* per process undo requests */
+/* this gets linked into the task_struct */
+struct sem_undo {
+    struct sem_undo *proc_next;
+    struct sem_undo *id_next;
+    int    semid;
+    short  semadj; 		/* semval adjusted by exit */
+    ushort sem_num; 		/* semaphore index in array semid */
+};      
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_SEM_H */