Reading from a file segmentation fault while running round robin algorithm - c

Question

I get this error when trying to run round robin algorithm, and the algorithms are working perfectly fine when taking input from user. this is the code:
else if (select==2)
{
FILE * filehandle;
char lyne[100];
char *item;
int reccount = 0;
// open file
filehandle = fopen("Input_Data1.txt","r");
// Read file line by line
while (fgets(lyne,99,filehandle))
{
numprocess =
printf("%s",lyne);
item = strtok(lyne," ");
p[reccount].arrivetime =atoi(item);
item = strtok(NULL," ");
p[reccount].bursttime =atoi(item);
reccount++;
}
//Close file
fclose(filehandle);
}
The error I get is segmentation fault (core dumped).
screen shot of the input file
I tried reading from a file execting the same result as reading from user input but I got the error showed in the image.

Answer 1

At least these issues:
Avoid atoi(NULL)
item = strtok(lyne," "); may return NULL.
item = strtok(NULL," "); may return NULL.
I suspect the 2nd should be item = strtok(NULL," \n");
NULL == filehandle?
Open may fail.
reccount may exceed max
No need for a -1
// fgets(lyne,99,filehandle)
fgets(lyne, sizeof lyne, filehandle)
FILE * filehandle = fopen("Input_Data1.txt","r");
if (filehandle == NULL) {
fprintf(stderr, "Open failed\n");
return;
}
char lyne[100];
int reccount = 0;
while (reccount < reccount_n && fgets(lyne, sizeof lyne, filehandle)) {
numprocess = printf("%s", lyne); // Unclear how OP is using numprocess
char *item = strtok(lyne," ");
if (item == NULL) {
fprintf(stderr, "strtok(lyne,\" \") failed\n");
return;
}
p[reccount].arrivetime =atoi(item);
item = strtok(NULL," \n");
if (item == NULL) {
fprintf(stderr, "strtok(NULL,\" \n\") failed\n");
return;
}
p[reccount].bursttime =atoi(item);
reccount++;
}
fclose(filehandle);