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questions related to header files
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| junky_fellow@yahoo.co.in 2005-09-27, 7:57 am |
| 1) In the header files I found the following line
#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 1)
in lots of places. What does it mean, especially
_POSIX_C_SOURCE >=1 ?
2) How to determine the various system limits. For eg maximum
number of characters in a file name, max number of processes per
user etc ?
3) There are certain typedefs which are defined in multiple files.
eg sizet_t is defined in stdio.h, stddef.h, types.h ? Why is it
so ? Which value is to be taken ?
4) I found two files "limits.h" and "syslimits.h" . What is
the purpose of these two files ? Why do we need to have two
different files to specify the limits ?
Thanx for any help in advance ...
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| Floyd L. Davidson 2005-09-27, 7:02 pm |
| junky_fellow@yahoo.co.in wrote:
>1) In the header files I found the following line
>#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 1)
>in lots of places. What does it mean, especially
>_POSIX_C_SOURCE >=1 ?
Take a look at the features.h header file.
>2) How to determine the various system limits. For eg maximum
>number of characters in a file name, max number of processes per
>user etc ?
>
>3) There are certain typedefs which are defined in multiple files.
>eg sizet_t is defined in stdio.h, stddef.h, types.h ? Why is it
>so ? Which value is to be taken ?
>4) I found two files "limits.h" and "syslimits.h" . What is
>the purpose of these two files ? Why do we need to have two
>different files to specify the limits ?
>
>Thanx for any help in advance ...
--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@apaflo.com
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