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NetBSD 6.1.5 - man page for types (netbsd section 3)

TYPES(3)			   BSD Library Functions Manual 			 TYPES(3)

     types -- standard system data types

     #include <sys/types.h>

     The <sys/types.h> header contains the common data types used in the system.  Although these
     are meant to be used within the kernel, most of the system data types are accessible also to
     user code.  A companion header <sys/param.h>, typically used in the kernel, includes
     <sys/types.h> and provides additional types as well as other facilities (see param(3)).

   Standard Types
     The following standards-compliant system data types are defined:

	   Type 	   Typical use			     Example
	   blkcnt_t	   file block counts		     stat(2)
	   blksize_t	   block sizes			     stat(2)
	   clock_t	   system clock ticks		     clock(3)
	   clockid_t	   clock IDs			     clock_settime(2)
	   dev_t	   device IDs			     devname(3)
	   fsblkcnt_t	   file system block counts	     -
	   fsfilcnt_t	   file system file counts	     -
	   gid_t	   group IDs			     getgid(2)
	   id_t 	   general identifier		     pset(3)
	   ino_t	   file serial numbers		     fs(5)
	   key_t	   interprocess communication	     ftok(3)
	   mode_t	   file attributes		     stat(2)
	   nlink_t	   link counts			     stat(2)
	   off_t	   file sizes			     fseek(3)
	   pid_t	   process and process group IDs     getpid(2)
	   size_t	   size of objects		     stddef(3)
	   ssize_t	   count of bytes		     write(2)
	   suseconds_t	   microseconds 		     gettimeofday(2)
	   time_t	   time in seconds		     time(3)
	   timer_t	   timer IDs			     timer_create(2)
	   uid_t	   user IDs			     setuid(2)
	   useconds_t	   time in microseconds 	     usleep(3)

     In addition, when included in user applications, <sys/types.h> includes <pthread.h>, and
     thus it defines also the types used in the POSIX Threads Library, pthread(3).

     Each described type may vary across machines and operating systems.  Only the following
     properties are guaranteed by the IEEE Std 1003.1-2001 (``POSIX.1'') standard:

	   1.	The type ssize_t is capable of storing integer values at least in the range [-1,

	   2.	The type useconds_t is an unsigned integer capable of storing values at least in
		the range [0, 1000000].

	   3.	The type suseconds_t is a signed integer capable of storing values at least in
		the range [-1, 1000000].

	   4.	The time_t and clock_t types are either integers or real-floating types.

	   5.	The following types are integers: gid_t, id_t, mode_t, nlink_t, and uid_t.

	   6.	The following types are signed integers: blkcnt_t, blksize_t, off_t, pid_t, and

	   7.	The following types are unsigned integers: fsblkcnt_t, fsfilcnt_t, ino_t, and

   NetBSD-specific Types
     In addition to the standard types, <sys/types.h> defines some data types specific to NetBSD.
     These are mostly used in the kernel.  A portable implementation should not rely on these
     types to be available in other systems.  Examples include:

	   Type 	   Typical use		      Example
	   cpuid_t	   CPU IDs		      cpuset(3)
	   daddr_t	   disk address 	      buffercache(9)
	   devmajor_t	   major device number	      getdevmajor(3)
	   lwp_t	   typedef of struct lwp      kthread(9)
	   u_quad_t	   synonym for uint64_t       strtouq(3)

     It can be noted that the standard ``C99 types'' described in stdint(3) are preferred to the
     older fixed size integer types prefixed with an ``u_'' (in other words, uint32_t should be
     used instead of u_int32_t).

     param(3), stdbool(3), stddef(3), stdint(3), stdlib(3), unistd(3)

     The <sys/types.h> header conforms to IEEE Std 1003.1-2001 (``POSIX.1'') with respect to the
     described standard types.

     The <sys/types.h> header first appeared in Version 7 AT&T UNIX.  In the current form the
     header appeared in NetBSD 0.9.

BSD					  April 10, 2011				      BSD

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