initstate_r in /lib/libc.so.6 crashing

[Ángel González]

El 27/06/11 00:26, Zeno escribió:
>   I am getting a crash when trying to use initstate_r:
>
>   (gdb) run
>   Starting program: /home/user/test.out
>
>   Program received signal SIGSEGV, Segmentation fault.
>   0x40052d00 in initstate_r () from /lib/libc.so.6
>
>   The code:
>
>   #include<stddef.h>
>   #include<stdio.h>
>   #include<string.h>
>   #include<stdlib.h>
>
>   #define STATELEN    256             /* random number state buffer */
>
>   main()
>   {
>    char randomStateBuffer[STATELEN];
>    struct random_data randData;
>
>    printf("Before initstate");
>     /* seed the random number generator */
>      initstate_r (time(NULL), (char *)&randomStateBuffer, STATELEN,
>     (struct random_data *)&randData);
>    printf("initstate done");
>
>   }
>
>   This code also crashes:
>   #include<stdlib.h>
>   #include<stdio.h>
>   #include<string.h>
>
>   typedef struct random_data random_data;
>
>   int main() {
>    char statebuf[256];
>    random_data randomData;
>
>    memset(&randomData, 0, sizeof(randomData));
>
>    initstate_r(0, statebuf, 256,&randomData);
>    return 0;
>   }
>
>   Any ideas? Thanks.
>
Do you have a prototype for all functions?
According to the man page initstate_r needs _SVID_SOURCE
or _BSD_SOURCE to be defined (seems to work without them here, though).
I don't see time.h either.

What's the size of your time_t? If the compiler thought it was 32 bits 
(eg. by
an implied function), but initstate_r expects 64 bits, there will be a
disagreement on what the different pieces at the stack are, andtaking 
something
different as an address would explain the crash.