struct array passing issue on linux

Hello All,

I am migrating C program from Solaris to Linux and it's not working on Linux. I don't understand why and I googled but found no results. I have array of STRUCT and when passing to subroutine by value or by reference the object is null. Here is my code:

Code:

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typedef    struct {
  char    x[14], y[14], z[14]; 
} COORDINATES;

typedef    struct {
  char    state[3];
  char    county[4];
  COORDINATES coord[MAX_COORD];
} ARP;

ARP site[MAX_SITE];

//call subroutine
compare_positions(site[i].coord[j]);

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Before passing to subroutine the values are good. But lost (null) when passed to subroutine. However, if I declared as single array then the value is passed fine. How do I fix this for Linux? I running gcc.

Thanks

In the code you posted, you're passing a COORDINATES object by value to the compare_positions function, so it cannot possibly be null.

Post a small but complete (compilable) program that exhibits the problem.

That's the frustration part. I don't understand the difference between Solaris vs. Linux or cc vs gcc. Everything works fine on Solaris. I will try to create a small program and test it.

Thanks

Quote:

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Originally Posted by btran007

That's the frustration part. I don't understand the difference between Solaris vs. Linux or cc vs gcc. Everything works fine on Solaris.

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The differences should not matter here. That they matter means that either one of the compilers or your code has a bug, and I am more inclined to believe that it is your code that has a bug that results in undefined behaviour: one of the symptoms of undefined behaviour is that the code could work as expected when compiled on one compiler/for one platform, yet fail to work as expected when compiled on another compiler/for another platform.

Quote:

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Originally Posted by btran007

I will try to create a small program and test it.

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Yes, you should do this. After all, in your code snippet from post #1, you did not even provide a declaration of compare_positions that is a prototype. It is difficult to reason about your program with so little to work with.

Here is the prototype. Nothing special.

void compare_positions(COORDINATES coord);

After creating a small program I discovered the error due to previous attempts to resolve this issue. In conclusion my program seems to be working but I had to remove array since it is not needed.

Thank you for all your comments and suggestions.