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Top Forums Programming Structure element accessing issue... Post 302186380 by Praveen_218 on Thursday 17th of April 2008 04:27:56 AM
Old 04-17-2008
Structure element accessing issue...

Hi all,
Can someone advice, why I'm getting a segmentation fault on a Linux system for a program which looks like the below one--:


typedef struct idev{
int p,
char q[10];
} Idev;

typedef struct abc{
int i;
Idev *idev_ptr;
} ABC;


int main(){
ABC a_var;

char str[10];
int i_var = 0;

/* I received 'a_var' populated by some function call as follows---*/

int result = foo(&a_var);
/*Received result == SUCESS*/

/*initializing str[] to all zero.*/
bzero(str, sizeof(str));

if(a_var.idev_ptr != NULL)
{
/*Access to this is pretty fine*/
i_var = a_var.idev_ptr->p;

/*But accessing array element gives the segmentation fault*/
strncpy(str, a_var.idev_ptr->q, 10);
}


if(a_var.id_q != NULL)
{
free(a_var.i_d); /*freed the memory*/
}

return 0; /*end of the program*/
}


Now please advice me, why I get the segmentation fault by just accessing a_var.idev_ptr->q ???

Last edited by Praveen_218; 04-17-2008 at 07:32 AM..
 

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curs_instr(3X)															    curs_instr(3X)

NAME
instr, innstr, winstr, winnstr, mvinstr, mvinnstr, mvwinstr, mvwinnstr - get a string of characters from a curses window SYNOPSIS
#include <curses.h> int instr(char *str); int innstr(char *str, int n); int winstr(WINDOW *win, char *str); int winnstr(WINDOW *win, char *str, int n); int mvinstr(int y, int x, char *str); int mvinnstr(int y, int x, char *str, int n); int mvwinstr(WINDOW *win, int y, int x, char *str); int mvwinnstr(WINDOW *win, int y, int x, char *str, int n); DESCRIPTION
These routines return a string of characters in str, extracted starting at the current cursor position in the named window. Attributes are stripped from the characters. The four functions with n as the last argument return a leading substring at most n characters long (exclu- sive of the trailing NUL). RETURN VALUE
All of the functions return ERR upon failure, or the number of characters actually read into the string. X/Open defines no error conditions. In this implementation, if the window parameter is null or the str parameter is null, a zero is returned. NOTES
Note that all routines except winnstr may be macros. PORTABILITY
SVr4 does not document whether a length limit includes or excludes the trailing NUL. The ncurses library extends the XSI description by allowing a negative value for n. In this case, the functions return the string ending at the right margin. SEE ALSO
curses(3X). curs_instr(3X)
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