NAME

types − primitive system data types

SYNOPSIS

#include <sys/types.h>

DESCRIPTION

The data types defined in the include file are used in UNIX system code; some data of these types are accessible to user code:

typedefstruct { int r[1]; } *physadr;
typedeflongdaddr_t;
typedef char *caddr_t;
typedefunsigned shortino_t;
typedeflongtime_t;
typedefintlabel_t[10];
typedefshortdev_t;
typedeflongoff_t;
/* major part of a device */
#definemajor(x)(int)(((unsigned)x>>8)&0377)
 /* minor part of a device */
#defineminor(x)(int)(x&0377)
 /* make a device number */
#definemakedev(x,y)(dev_t)(((x)<<8) | (y))

The form daddr_t is used for disk addresses except in an i-node on disk, see filsys(5). Times are encoded in seconds since 00:00:00 GMT, January 1, 1970. The major and minor parts of a device code specify kind and unit number of a device and are installation-dependent. Offsets are measured in bytes from the beginning of a file. The label_t variables are used to save the processor state while another process is running. 

SEE ALSO

filsys(5), time(2), lseek(2), adb(1)

7th Edition