*
* @APPLE_LICENSE_HEADER_START@
*
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
- *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* SVID compatible sem.h file
*
* Author: Daniel Boulet
- */
-/*
* John Bellardo modified the implementation for Darwin. 12/2000
*/
#ifndef _SYS_SEM_H_
#define _SYS_SEM_H_
-#include <sys/appleapiopts.h>
-#include <sys/ipc.h>
-
-struct sem {
- u_short semval; /* semaphore value */
- pid_t sempid; /* pid of last operation */
- u_short semncnt; /* # awaiting semval > cval */
- u_short semzcnt; /* # awaiting semval = 0 */
-};
-
-struct semid_ds {
- struct ipc_perm sem_perm; /* operation permission struct */
- struct sem *sem_base; /* pointer to first semaphore in set */
- u_short sem_nsems; /* number of sems in set */
- time_t sem_otime; /* last operation time */
- long sem_pad1; /* SVABI/386 says I need this here */
- time_t sem_ctime; /* last change time */
- /* Times measured in secs since */
- /* 00:00:00 GMT, Jan. 1, 1970 */
- long sem_pad2; /* SVABI/386 says I need this here */
- long sem_pad3[4]; /* SVABI/386 says I need this here */
-};
-
-/*
- * semop's sops parameter structure
- */
-struct sembuf {
- u_short sem_num; /* semaphore # */
- short sem_op; /* semaphore operation */
- short sem_flg; /* operation flags */
-};
-#define SEM_UNDO 010000
-
-#define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
-
-/*
- * semctl's arg parameter structure
- */
-union semun {
- int val; /* value for SETVAL */
- struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
- u_short *array; /* array for GETALL & SETALL */
-};
-/*
- * commands for semctl
- */
-#define GETNCNT 3 /* Return the value of semncnt {READ} */
-#define GETPID 4 /* Return the value of sempid {READ} */
-#define GETVAL 5 /* Return the value of semval {READ} */
-#define GETALL 6 /* Return semvals into arg.array {READ} */
-#define GETZCNT 7 /* Return the value of semzcnt {READ} */
-#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
-#define SETALL 9 /* Set semvals from arg.array {ALTER} */
+#include <sys/cdefs.h>
+#include <sys/_types.h>
/*
- * Permissions
+ * [XSI] All of the symbols from <sys/ipc.h> SHALL be defined
+ * when this header is included
*/
-#define SEM_A 0200 /* alter permission */
-#define SEM_R 0400 /* read permission */
+#include <sys/ipc.h>
-#ifdef KERNEL
-#ifdef __APPLE_API_PRIVATE
-/*
- * Kernel implementation stuff
- */
-#define SEMVMX 32767 /* semaphore maximum value */
-#define SEMAEM 16384 /* adjust on exit max value */
/*
- * Configuration parameters. SEMMNI, SEMMNS, and SEMMNU are hard limits.
- * The code dynamically allocates enough memory to satisfy the current
- * demand in even increments of SEMMNI_INC, SEMMNS_INC, and SEMMNU_INC.
- * The code will never allocate more than the hard limits. The *_INC's
- * are defined in the kernel section of the header.
- */
-/*
- * Configuration parameters
+ * [XSI] The pid_t, time_t, key_t, and size_t types shall be defined as
+ * described in <sys/types.h>.
+ *
+ * NOTE: The definition of the key_t type is implicit from the
+ * inclusion of <sys/ipc.h>
*/
-#ifndef SEMMNS /* # of semaphores in system */
-#define SEMMNS (1048576/sizeof(struct sem))
-#endif /* no more than 1M of semaphore data */
-#ifndef SEMMNI /* # of semaphore identifiers */
-#define SEMMNI SEMMNS /* max of 1 for each semaphore */
-#endif
-#ifndef SEMUME
-#define SEMUME 10 /* max # of undo entries per process */
+#ifndef _PID_T
+typedef __darwin_pid_t pid_t;
+#define _PID_T
#endif
-#ifndef SEMMNU /* # of undo structures in system */
-#define SEMMNU SEMMNS /* 1 for each semaphore. This is quite large */
-#endif /* This should be max 1 for each process */
-/* shouldn't need tuning */
-#ifndef SEMMAP
-#define SEMMAP 30 /* # of entries in semaphore map */
-#endif
-#ifndef SEMMSL
-#define SEMMSL SEMMNS /* max # of semaphores per id */
-#endif
-#ifndef SEMOPM
-#define SEMOPM 100 /* max # of operations per semop call */
+#ifndef _TIME_T
+#define _TIME_T
+typedef __darwin_time_t time_t;
#endif
+#ifndef _SIZE_T
+#define _SIZE_T
+typedef __darwin_size_t size_t;
+#endif
/*
- * Undo structure (one per process)
+ * Technically, we should force all code references to the new structure
+ * definition, not in just the standards conformance case, and leave the
+ * legacy interface there for binary compatibility only. Currently, we
+ * are only forcing this for programs requesting standards conformance.
*/
-struct sem_undo {
- struct sem_undo *un_next; /* ptr to next active undo structure */
- struct proc *un_proc; /* owner of this structure */
- short un_cnt; /* # of active entries */
- struct undo {
- short un_adjval; /* adjust on exit values */
- short un_num; /* semaphore # */
- int un_id; /* semid */
- } un_ent[SEMUME]; /* undo entries */
+#if defined(__POSIX_C_SOURCE) || defined(kernel) || defined(__LP64__)
+/*
+ * Structure used internally.
+ *
+ * This structure is exposed because standards dictate that it is used as
+ * the semun union member 'buf' as the fourth argment to semctl() when the
+ * third argument is IPC_STAT or IPC_SET.
+ *
+ * Note: only the fields sem_perm, sem_nsems, sem_otime, and sem_ctime
+ * are meaningful in user space.
+ */
+struct __semid_ds_new {
+ struct __ipc_perm_new sem_perm; /* [XSI] operation permission struct */
+ __int32_t sem_base; /* 32 bit base ptr for semaphore set */
+ unsigned short sem_nsems; /* [XSI] number of sems in set */
+ time_t sem_otime; /* [XSI] last operation time */
+ __int32_t sem_pad1; /* RESERVED: DO NOT USE! */
+ time_t sem_ctime; /* [XSI] last change time */
+ /* Times measured in secs since */
+ /* 00:00:00 GMT, Jan. 1, 1970 */
+ __int32_t sem_pad2; /* RESERVED: DO NOT USE! */
+ __int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */
+};
+#define semid_ds __semid_ds_new
+#else /* !_POSIX_C_SOURCE */
+#define semid_ds __semid_ds_old
+#endif /* !_POSIX_C_SOURCE */
+
+#if !defined(__POSIX_C_SOURCE) && !defined(__LP64__)
+struct __semid_ds_old {
+ struct __ipc_perm_old sem_perm; /* [XSI] operation permission struct */
+ __int32_t sem_base; /* 32 bit base ptr for semaphore set */
+ unsigned short sem_nsems; /* [XSI] number of sems in set */
+ time_t sem_otime; /* [XSI] last operation time */
+ __int32_t sem_pad1; /* RESERVED: DO NOT USE! */
+ time_t sem_ctime; /* [XSI] last change time */
+ /* Times measured in secs since */
+ /* 00:00:00 GMT, Jan. 1, 1970 */
+ __int32_t sem_pad2; /* RESERVED: DO NOT USE! */
+ __int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */
};
+#endif /* !_POSIX_C_SOURCE */
/*
- * semaphore info struct
+ * Possible values for the third argument to semctl()
*/
-struct seminfo {
- int semmap, /* # of entries in semaphore map */
- semmni, /* # of semaphore identifiers */
- semmns, /* # of semaphores in system */
- semmnu, /* # of undo structures in system */
- semmsl, /* max # of semaphores per id */
- semopm, /* max # of operations per semop call */
- semume, /* max # of undo entries per process */
- semusz, /* size in bytes of undo structure */
- semvmx, /* semaphore maximum value */
- semaem; /* adjust on exit max value */
-};
-extern struct seminfo seminfo;
+#define GETNCNT 3 /* [XSI] Return the value of semncnt {READ} */
+#define GETPID 4 /* [XSI] Return the value of sempid {READ} */
+#define GETVAL 5 /* [XSI] Return the value of semval {READ} */
+#define GETALL 6 /* [XSI] Return semvals into arg.array {READ} */
+#define GETZCNT 7 /* [XSI] Return the value of semzcnt {READ} */
+#define SETVAL 8 /* [XSI] Set the value of semval to arg.val {ALTER} */
+#define SETALL 9 /* [XSI] Set semvals from arg.array {ALTER} */
-/* internal "mode" bits */
-#define SEM_ALLOC 01000 /* semaphore is allocated */
-#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
-#define SEMMNI_INC 8 /* increment value for semaphore identifiers */
-#define SEMMNS_INC 64 /* increment value for semaphores */
-#define SEMMNU_INC 32 /* increment value for undo structures */
+/* A semaphore; this is an anonymous structure, not for external use */
+struct sem {
+ unsigned short semval; /* semaphore value */
+ pid_t sempid; /* pid of last operation */
+ unsigned short semncnt; /* # awaiting semval > cval */
+ unsigned short semzcnt; /* # awaiting semval == 0 */
+};
+
/*
- * Due to the way semaphore memory is allocated, we have to ensure that
- * SEMUSZ is properly aligned.
- *
- * We are not doing strange semaphore memory allocation anymore, so
- * these macros are no longer needed.
+ * Structure of array element for second argument to semop()
*/
+struct sembuf {
+ unsigned short sem_num; /* [XSI] semaphore # */
+ short sem_op; /* [XSI] semaphore operation */
+ short sem_flg; /* [XSI] operation flags */
+};
/*
- * #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
+ * Possible flag values for sem_flg
*/
+#define SEM_UNDO 010000 /* [XSI] Set up adjust on exit entry */
+
+
+#ifndef _POSIX_C_SOURCE
-/* actual size of an undo structure */
/*
- * #define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
+ * System imposed limit on the value of the third parameter to semop().
+ * This is arbitrary, and the standards unfortunately do not provide a
+ * way for user applications to retrieve this value (e.g. via sysconf()
+ * or from a manifest value in <unistd.h>). The value shown here is
+ * informational, and subject to change in future revisions.
*/
-#define SEMUSZ sizeof(struct sem_undo)
+#define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
-extern struct semid_ds *sema; /* semaphore id pool */
-extern struct sem *sem; /* semaphore pool */
-/* This is now a struct sem_undo with the new memory allocation
- * extern int *semu; /* undo structure pool
- */
-extern struct sem_undo *semu; /* undo structure pool */
/*
- * Macro to find a particular sem_undo vector
- */
-/* Until we can initialize seminfo.semusz to SEMUSZ, we hard code the size macro
- * in SEMU. This should be fixed when (if) we implement dynamic pool sizes
+ * Union used as the fourth argment to semctl() in all cases. Specific
+ * member values are used for different values of the third parameter:
+ *
+ * Command Member
+ * ------------------------------------------- ------
+ * GETALL, SETALL array
+ * SETVAL val
+ * IPC_STAT, IPC_SET buf
*
- * #define SEMU(ix) ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
- */
-/*
- * This macro doesn't work because we are using a staticly allocated array
- * for semu now.
- * #define SEMU(ix) ((struct sem_undo *)(((intptr_t)semu)+ix * SEMUSZ))
+ * The union definition is intended to be defined by the user application
+ * in conforming applications; it is provided here for two reasons:
+ *
+ * 1) Historical source compatability for non-conforming applications
+ * expecting this header to declare the union type on their behalf
+ *
+ * 2) Documentation; specifically, 64 bit applications that do not pass
+ * this structure for 'val', or, alternately, a 64 bit type, will
+ * not function correctly
*/
-#define SEMU(ix) (&semu[ix])
+union semun {
+ int val; /* value for SETVAL */
+ struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
+ unsigned short *array; /* array for GETALL & SETALL */
+};
+typedef union semun semun_t;
/*
- * Process sem_undo vectors at proc exit.
+ * Permissions
*/
-void semexit __P((struct proc *p));
+#define SEM_A 0200 /* alter permission */
+#define SEM_R 0400 /* read permission */
-/*
- * Parameters to the semconfig system call
- */
-typedef enum {
- SEM_CONFIG_FREEZE, /* Freeze the semaphore facility. */
- SEM_CONFIG_THAW /* Thaw the semaphore facility. */
-} semconfig_ctl_t;
+#endif /* !_POSIX_C_SOURCE */
-#endif /* __APPLE_API_PRIVATE */
-#endif /* KERNEL */
#ifndef KERNEL
-#include <sys/cdefs.h>
__BEGIN_DECLS
-int semsys __P((int, ...));
-int semctl __P((int, int, int, ...));
-int semget __P((key_t, int, int));
-int semop __P((int, struct sembuf *,unsigned));
+#ifndef _POSIX_C_SOURCE
+int semsys(int, ...);
+#endif /* !_POSIX_C_SOURCE */
+int semctl(int, int, int, ...) __DARWIN_ALIAS(semctl);
+int semget(key_t, int, int);
+int semop(int, struct sembuf *, size_t);
__END_DECLS
+
#endif /* !KERNEL */
#endif /* !_SEM_H_ */
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