[英]Receiving segmentation fault (core dumped) in C program
Okay, so, according to this post , I understand that I'm trying to access memory that I do not have access to.好的,所以,根据这篇文章,我知道我正在尝试访问我无法访问的内存。 The only thing I can think of would be where I'm creating an instance of task and assigning it values, but, looking at this post, I can't see where my implementation is incorrect.
我唯一能想到的是我在哪里创建任务实例并为其分配值,但是,查看这篇文章,我看不出我的实现在哪里不正确。
Any help would be greatly appreciated.任何帮助将不胜感激。
#include "task.h"
struct node{
Task *task;
struct node *next;
};
void insert(struct node **head, Task *task);
void delete(struct node **head, Task *task);
void traverse(struct node *head);
#ifndef TASK_H
#define TASK_H
typedef struct task{
char *name;
int tid;
int priority;
int burst;
} Task;
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "list.h"
#include "task.h"
#include "schedulers.h"
void add(char *name, int priority, int burst){
printf("beginning of add\n"); // Just a test. I never see this message print
static int x = 1;
struct node *list_head = NULL;
Task xtask = (Task) { .name = name, .tid = x, .priority = priority, .burst = burst};
insert(&list_head, &xtask);
x++;
}
void schedule(){
printf("test"); // just a place holder for now
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "task.h"
#include "list.h"
#include schedulers.h"
#define SIZE 100
int main(int argc, char ** argv[]){
FILE *in;
char *temp;
char task[SIZE];
char *name;
int priority;
int burst;
in = fopen(argv[1], "r");
if (argv[1] != NULL){
while (fgets(task, SIZE, in) != NULL){
temp = strdup(task);
name = strsep(&temp, ",");
priority = atoi(strsep(&temp, ","));
burst = atoi(strsep(&temp, ","));
add(name, priority, burst);
free(temp);
}
fclose(in);
}
else{
printf("invalid\n");
return 0;
}
schedule();
return 0;
}
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "list.h"
#include "task.h"
void insert(struct node **head, Task *newTask){
struct node *newNode = malloc(sizeof(struct node));
newNode ->task = newTask;
newNode ->next = *head;
*head = newNode;
}
void delete(struct node **head, Task *task){
struct node *temp;
struct node *prev;
temp = *head;
if (strcmp(task ->name, temp -> task -> name) == 0){
*head = (*head) -> next;
}
else {
prev = *head;
temp = temp -> next;
while (strcmp(task -> name, temp -> task -> name) != 0) {
prev = temp;
temp = temp -> next;
}
prev -> next = temp -> next;
}
}
void traverse(struct node *head){
struct node *temp;
temp = head;
while (temp != NULL){
printf("[%s] [%d] [%d]\n", temp-> task -> name, temp -> task -> priority, temp -> task -> burst);
temp = temp -> next;
}
}
Here's one very big problem:这是一个非常大的问题:
void add(char *name, int priority, int burst){
printf("beginning of add\n"); // Just a test. I never see this message print
static int x = 1; // <-- Since "x" is static, it will persist after you exit add()
struct node *list_head = NULL; // But both *list_head and xtask will be INVALID the moment you leave add()
Task xtask = (Task) { .name = name, .tid = x, .priority = priority, .burst = burst};
x++;
If you're trying to use list_head and/or xtask outside of add()
.. that could easily be the cause of your segmentation violation.如果您尝试在
add()
之外使用 list_head 和/或 xtask .. 这很容易成为您的分段违规的原因。
POTENTIAL SOLUTION:可能的解决方案:
Declare them outside of add(), and pass them in as parameters.在add()之外声明它们,并将它们作为参数传入。
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