Mail Archives: djgpp-workers/2003/01/15/16:32:10
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Hello.
> ------- Original Message -------
> From : sandmann AT clio DOT rice DOT edu (Charles Sandmann)
> Date : Sun, 5 Jan 2003 21:15:08 -0600 (CST)
>> > > But (at least this version) needs a second stack (probably for keeping track
>> > > of mutex, i don't know...). DJGPP has no sigstack or sigaltstack.
>Take a look at go32/dpmiexcp.c and go32/exceptn.S
>
>The documentation I have for sigstack looks like it would be fairly
>straightforward to implement - the current exception stack is declared
>in exceptn.S
According to the man pages:
"sigstack() is to be obsoleted at a future date.
"A portable application, when being written or rewritten, should use sigaltstack() instead
of sigstack()."
The sigaltstack structure is defined as:
struct sigaltstack {
char *ss_sp;
int ss_size;
int ss_flags;
};
(would this go in signal.h? ss_size may better be difined as size_t?)
It is a bit confusing, because the structure is similar to stack_t (I notice DJGPP doesn't
have that either). The values seem normally defined as follows:
ss_sp = malloc(SIGSTKSZ)
ss_size = SIGSTKSZ;
ss_flags = 0;
SIGSTKSZ is "the number of bytes/chars that would be used to cover the usual case
when allocating an alternate stack area."
For Linux it was defined as:
#define MINSIGSTKSZ 131027 /* min. stack size for sigaltstack() */
#define SIGSTKSZ 262144 /* default stack size for sigaltstack() */
GNU platforms seem to store the sigaltstack() routine itself in a separate 'sigaltstack.c'.
Would this also be suitable for DJGPP?
Ben
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