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Appendix A
Header Files
This appendix describes the contents of the header files found on a system that supports
Standard C and POSIX. The macros, types, structures, and functions defined in each header
file are listed.
Description of Tables
Both the C and POSIX standards are concerned with namespace pollution. Namespace
pollution is defining symbols that are not expected by an application. Applications indicate
which symbols they are expecting by defining feature-test macros. The tables in th
is appendix
have three columns.
·
The first column lists symbols defined by the C standard. These symbols are visible
whenever the header file is included; no feature tests are required to make these symbols
visible.
·
The second column lists additional symbols that will be defined when the macro
POSIX
_
SOURCE
is defined prior to the 
#include
statement.
·
The third column lists symbols that are optional when _
POSIX
_
SOURCE
is defined.
Applications should tolerate these symbols being present but must not depend on them.
*
Some headers reserve additional symbols. These symbols are indicated under Notes. POSIX
also reserves all symbols which end with 
_t
, as in 
size_t
.
If you do not define _
POSIX
_
SOURCE
do not include headers which contain only POSIX
symbols. A header contains only POSIX symbols if all of its symbols are in the
"_
POSIX
_
SOURCE
defined" column; for example, 
<termios.h>
.
*The POSIX Interpretation Committee has ruled that implementations conforming to the 1988
revision of the standard may include any POSIX symbol in any POSIX header. The 1990 revision will
enforce the ''may include'' column.
Yes, there is a logical fourth column for symbols which are optional when _
POSIX
_
SOURCE
is not
defined. There are no such symbols and I have left that column out.
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assert
.
h
The 
<assert.h>
header defines the 
assert()
macro. This is used for debugging.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain: 
May contain:
Macros:
assert
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Notes:
Tests the macro 
NDEBUG
.
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ctype.h
The 
<ctype.h>
header defines the Standard C character classification functions. These may
also be macros.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain: 
May contain:
Functions:
isalnum()
isalpha()
iscntrl()
isdigit()
isgraph()
islower()
isprint()
ispunct()
isspace()
isupper()
isxdigit()
tolower()
toupper()
Notes:
Reserves all symbols beginning with 
is
or 
to
.
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dirent. h
The 
<dirent.h>
header defines the functions and data structures used for reading
directories portably.
Always Defined
When _
POSIX
_
SOURCE
Defined
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Must contain:
May contain:
Types:
DIR
Structures:
dirent
Functions:
closedir()
opendir()
readdir()
rewinddir()
Notes:
Any application that uses this header file should not declare any symbols that begin with 
d_
.
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errno.h
The 
<errno.h>
header defines all of the error codes used by an implementation. May
contain many more macros of the form 
Exxxxx
.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain:
May contain:
Macros.
EDOM
E2BIG
ERANGE
EACCES
EAGAIN
EBADF
EBUSY
ECHILD
EDEADLK
EDOM
EEXIST
EFAULT
EFBIG
EINTR
EINVAL
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EIO
EISDIR
EMFILE
EMLINK
ENAM
ETOOLONG
ENFILE
ENODEV
ENOENT
ENOEXEC
ENOLCK
ENOMEM
ENOSPC
ENOSYS
ENOTDIR
ENOTEMPTY
ENOTTY
ENXIO
EPERM
EPIPE
ERANGE
EROFS
ESPIPE
ESRCH
EXDEV
Notes:
The external variable 
errno
is declared as an int.
Applications should not declare any symbols that begin with an 
E
followed by an uppercase
letter or digit.
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fcntl. h
The 
<fcntl.h>
function defines the 
creat()
fcntl()
, and 
open()
functions along
with the macros used by those functions.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain:
May contain:
Macros:
FD_CLOEXEC
SEEK_CUR
F_DUPFD
SEEK_END
F_GETFD
SEEK_SET
F_GETFL
S_IRGRP
F_GETLK
S_IROTH
F_RDLCK
S_IRUSR
F_SETFD
S_IRWXG
F_SETFL
S_IRWXO
F_SETLK
S_IRWXU
F_SETLK
W
S_ISBLK
F_UNLCK
S_ISCHR
F_WRLCK
S_ISDIR
O_ACCMODE
S_ISFIFO
O_APPEND
S_ISGID
O_CREAT
S_ISREG
O_EXCL
S_ISUID
O_NOCTTY
S_IWGRP
O_NONBLOCK
S_IWOTH
O_RDONLY
S_IWUSR
O_RDWR
S_IXGRP
O_TRUNC
S_IXOTH
O_WRONLY
S_IXUSR
Structures:
flock
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Fu
nctions:
creat()
fcntl()
open()
Notes:
Applications should not declare any symbols that start with l
_
.
Applications must 
#undef
all symbols that begin with 
F_
S_
, or 
O_
.
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float.h
The 
<float.h>
function defines a number of floating-point constants useful for portable
applications.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain:
May contain:
Macros:
DBL_DIG
DBL_EPSILON
DBL_MANT_DIG
DBL_MAX
DBL_MAX_10_EXP
DBL_MAX_EXP
DBL_MIN
DBL_MIN_10_EXP
DBL_MIN_EXP
FLT_DIG
FLT_EPSILON
FLT_MANT_DIG
FLT_
MAX
FLT_MAX_10_EXP
FLT_MAX_EXP
FLT_MIN
FLT_MIN_10_EXP
FLT_MIN_EXP
FLT_RADIX
FLT_ROUNDS
LDBL_DIG
LDBL_EPSILON
LDBL_MANT_DIG
LDBL_MAX
LDBL_MAX_10_EXP
LDBL_MAX_EXP
LDBL_MIN
LDBL_MIN_10_EXP
LDBL_MIN_EXP
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grp.h
The 
<grp.h>
function defines the 
struc
group
returned by the group database functions
getgrid()
and 
getgrnam()
.
Always Defined
When _POSIX_SOURCE Defined
Must
contain:
May contain:
Structures:
group
Functions:
getgrgid()
getgrnam()
Notes:
Applications shall not declare any symbols that begin with 
gr_
.
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limits.h
The 
<limits.h>
function defines implementation limits.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain:
Macros:
CHAR_BIT
ARG_MAX
***
CHAR_MIN
CHILD_MAX
**
CHAR_MAX
LINK_MAX
**
INT_MIN
MAX_CANON
**
INT_MAX
MAX_INPUT
**
LONG_MIN
NAME_MAX
**
LONG_MAX
NGROUPS_MAX
**
MB_LEN_MAX
OPEN_MAX
**
SCHAR_MIN
PATH_
MAX
**
SCHAR_MAX
PIPE_BUF
**
SHRT_MIN
SSIZE_MAX
*
SHRT_MAX
STREAM_MAX
***
,
*
UCHAR_MAX
TZNAME_MAX
*
UINT_MAX
_POSIX_ARG_MAX
ULONG_MAX
_POSIX_CHILD_MAX
USHRT_MAX
_POSIX_LINK_MAX
_POSIX_MAX_CANON
_POSIX_MAX_INPUT
_POSIX_NAME_MAX
_POSIX_NGROUPS_MAX
_POSIX_OPEN_MAX
_POSIX_PATH_MAX
_POSIX_PIPE_BUF
_POSIX_SSIZE_MAX
*
_POSIX_STREAM_MAX
*
_POSIX_TZNAME_MAX
*
Notes:
* indicates macros added to 
<limits.h>
by the 1990 revision to the standard.
** indicates macros that may be omitted from 
<limits.h>
on implementations where
pathconf()
must be used.
***indicates macros that may be omitted from 
<limits.h>
on implementations where
sysconf()
must be used.
Applications should not declare any symbols that end 
_MAX
.
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locale.h
The 
<locale.h>
function defines symbols used by the internationalization functions
setlocale()
and 
localeconv()
.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain:
May contain:
Macros:
LC_ALL
LC_COLLATE
LC_CTYPE
LC_MONETARY
LC_NUMERIC
LC_TIME
NULL
Structures:
lconv
Functions:
setlocale()
localeconv()
Notes:
Applications should 
#undef
any symbols that they 
#define
which begin with 
LC_
followed by an upper-case letter.
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math.h
The 
<math.h>
function defines the Standard C math functions.
Always Defined
When _
POSIX
_
SOURCE
Defined
Must contain:
May contain:
Macros:
HUGE_VAL
Functions:
acos()
asin()
atan2()
atan()
ceil()
cos()
cosh()
exp()
fabs()
floor()
fmod()
frexp()
ldexp()
logl0()
log()
mo
df()
pow()
sin()
sinh()
sqrt()
tan()
tanh()
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