QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Wrapping the select() library function |
| Ref. No. |
QNX.000001751 |
| Category(ies) |
Development |
| Issue |
We need to "wrap" the select() system call.
i.e. we want to override select() with our own version:
x09x09int select(.....)
x09x09{
x09x09x09/* do stuff */
x09x09x09invoke the system select()
x09x09x09/* do other stuff */
x09x09}
Therefore, we need a way to get at the original, system select(). On most Unix systems, two symbols are provided for the select() system call: select and _select, so we can use the _select symbol to get at the system select(). On other Unix systems you can use the syscall() function to invoke the select() system call.
QNX does not have the _select symbol or the syscall() function. So, is it possible to wrap the select() system call?
|
| Solution |
The easiest way to do the selects is by making a myselect function.
<t.c >
myselect(){
x09.
x09.
x09select()
x09.
x09.
}
<i.h >
#define select myselect
and do not include the i.h in the t.c and it will be two different selects. |
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