gets() versus fgets()

[nhutchin]

Hello All,
My first venture into trial by forum, please be tolerant

While trying to understand the delights of shared memory the following code gives a segmentation fault error with fgets(), however, with gets() (naughty I know) the program works fine.

#include <stdio.h>
#include <stdlib.h>

char s[20], *rs;
struct bmds *p_bmds; /* Shared memory structure */

/* Shared memory set-up and working across processes */

while( p_bmds->id == 1 ){
printf("\n");
printf("Set flag? ");
rs = fgets(s, 20, 0);
printf("\n");
n = atoi(s);
p_bmds->flags = n;
printf("FLAGS %d \r",p_bmds->flags);
printf("Set gauge? ");
rs = fgets(s, 20, 0);
printf("\n");
g = atof(s);
p_bmds->gauge[0] = g;
printf("FLAGS %d \r",p_bmds->flags);
}

Suggestions please??

[Cabhan]

Erm, you're passing in 0 (NULL) for the stream to read from. It should be "stdin".

[nhutchin]

Thank you.
I am guilty here of mixing the file descriptor for stdin (0) and FILE *stream.
Another case of "RTFM" {Read The Flipin Man-pages}, properly!!!!!

Thanks again for the speedy reply, very much appreciated.