Include sys types h in linux

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Include sys types h in linux

The data types defined in < sys/types.h >are as follows:

32-bit Solaris

The data types listed below are defined in < sys/types.h >for 32-bit Solaris.

typedef struct < int r[1]; >*physadr; typedef long clock_t; typedef long daddr_t; typedef char * caddr_t; typedef unsigned char unchar; typedef unsigned short ushort; typedef unsigned int uint; typedef unsigned long ulong_t; typedef unsigned long ino_t; typedef long uid_t; typedef long gid_t; typedef ulong_t nlink_t; typedef ulong_t mode_t; typedef short cnt_t; typedef long time_t; typedef int label_t[10]; typedef ulong_t dev_t; typedef long off_t; typedef long pid_t; typedef long paddr_t; typedef int key_t; typedef unsigned char use_t; typedef short sysid_t; typedef short index_t; typedef short lock_t; typedef unsigned int size_t; typedef long clock_t; typedef long pid_t;

64-bit Solaris

The data types listed below are defined in < sys/types.h >for 64-bit Solaris.

typedef long blkcnt_t typedef long clock_t typedef long daddr_t typedef ulong_t dev_t typedef ulong_t fsblkcnt_t typedef ulong_t fsfilcnt_t typedef int gid_t typedef int id_t typedef long ino_t typedef int key_t typedef uint_t major_t typedef uint_t minor_t typedef uint_t mode_t typedef uint_t nlink_t typedef int pid_t typedef ptrdiff_t intptr_t typedef ulong_t rlim_t typedef ulong_t size_t typedef uint_t speed_t typedef long ssize_t typedef long suseconds_t typedef uint_t tcflag_t typedef long time_t typedef int uid_t typedef int wchar_t

Preprocessor Symbols

For 32-bit programs, pointers and the C data types int and long are all 32-bit quantities. For 64-bit programs, pointers and the C data type long are defined as 64-bit quantities.

The preprocessor symbol _ILP32 , made visible by the inclusion of < sys/types.h >, can be used with the preprocessor #ifdef construct to define sections of code that will be compiled only as part of a 32-bit version of a given C program.

The preprocessor symbol _LP64 can be used in the same way to define sections of code that will be compiled only as part of a 64-bit version of a given C program. See EXAMPLES.

This header incorporates definitions of other preprocessor symbols that can be useful when keeping code portable between different instruction set architectures.

_LITTLE_ENDIAN
_BIG_ENDIAN The natural byte order of the processor. A pointer to an int points to the least/most significant byte of that int .

_STACK_GROWS_UPWARD
_STACK_GROWS_DOWNWARD The processor specific direction of stack growth. A push onto the stack increases/decreases the stack pointer, so it stores data at successively higher/lower addresses.

_CHAR_IS_UNSIGNED
_CHAR_IS_SIGNED The C Compiler implements objects of type char as unsigned or signed respectively. This is really an implementation choice of the compiler, but it is specified in the ABI and tends to be uniform across compilers for an instruction set architecture.

_CHAR_ALIGNMENT
_SHORT_ALIGNMENT
_INT_ALIGNMENT
_LONG_ALIGNMENT
_LONG_LONG_ALIGNMENT
_DOUBLE_ALIGNMENT
_LONG_DOUBLE_ALIGNMENT
_POINTER_ALIGNMENT
_FLOAT_ALIGNMENT The ABI defines alignment requirements of each of the primitive object types. Some, if not all, might be hardware requirements as well. The values are expressed in bytes.

_MAX_ALIGNMENT The most stringent alignment requirement as specified by the ABI. Equal to the maximum of all the above _ XXX _ ALIGNMENT values.

_LONG_LONG_ALIGNMENT_32 The 32-bit ABI supported by a 64-bit kernel may have different alignment requirements for primitive object types. The value of this identifier is expressed in bytes.

USAGE

The daddr_t type is used for disk addresses except in an inode on disk. Times are encoded in seconds since 00:00:00 UTC, 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[] types are used to save the processor state while another process is running.

EXAMPLES

Example 1 Use of preprocessor symbol _LP64 .

In the following example, the preprocessor symbol _LP64 defines sections of code that will be compiled only as part of a 64-bit version of the given C program.

#include sys/types.h> . #ifdef _LP64 printf("The data model is LP64 in this environment\n"); #else #ifdef _ILP32 printf("The data model is ILP32 in this environment\n"); #else #error "Unknown data model!" #endif #endif

ATTRIBUTES

See attributes (5) for descriptions of the following attributes:

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Where is sys/types.h located?

I just found out that the and headers are located in the /usr/include folder in Ubuntu server, but I don’t find sys/types.h . And I start to suspect the compiler won’t actually use the header file in the /usr/include folder. Is this true, and where is the file located?

5 Answers 5

My Debian box (and hopefully Ubuntu haven’t butchered it too much in their zeal) has it in /usr/include/sys/types.h .

Your best bet is to execute:

find /usr/include -name types.h find / -name types.h # if not found by one above 

However, keep in mind that the development stuff may not even be installed on a server. Unless it’s a server for a compiler farm, it wouldn’t surprise me if the compiler and a bunch of other stuff was not part of the default install.

If the compiler is locating it somewhere and you just don’t know where, you can use something like:

echo "#include " | gcc -E -x c - | grep /types.h 

to find out where it’s getting it from.

• stops after the pre-processing phase ( -E );
• forces the file to be treated as C source code ( -x c ); and
• retrieves the program from standard input ( — ), in this case from the echo statement.

The final grep just strips out the unimportant lines leaving the ones that are likely to contain the location of the included file.

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