问题描述
在以下情况下,我遇到了细分错误: 从文件中读取IP地址列表时,我将IP地址和端口存储在链接列表中. 根据链接列表逻辑,当我的while循环用于文件读取时,它本身会重复-当我再次分配临时指针时,我会遇到分段错误.
I'm getting a segmentation fault for the below scenario: When reading from a file for a list of ip addresses, i store the IP ADDRESS and port in a link list. As my while loops for file reading repeats itself, as per link list logic - when i malloc my temp pointer again i face segmentation fault.
请在下面的代码段中找到
Please find below the code snippet:
struct woker_conf
{
int port;
char *ip_address;
struct worker_conf *next;
} *head;
void open(int8_t nbrwrk)
{
FILE *fp = NULL;
char line[1024] = {0};
int i = 1;
char *ch;
struct worker_conf *config, *temp;
head = NULL;
fp = fopen("abcd.txt","r");
if (fp == NULL)
exit(1);
while (fgets(line, sizeof line, fp) != NULL && i<=nbrwrk )
{
ch = strtok(line,"=");
while (ch != NULL)
{
if (strstr(ch,"worker") ! = NULL)
{
// temp = NULL;-> segmentation fault with and without this line
temp = (struct worker_conf *)malloc(sizeof(struct worker_conf));
ch = strtok(NULL," ");
strcpy(temp->ip_Address, ch);
if (head == NULL)
{ head = temp;
head->next = NULL;
}
config = (struct worker_conf *)head;
while (config->next != NULL)
config = config->next;
config->next = temp;
config = temp;
config->next = NULL;
}
}
}
}
文件格式为:
worker1 = 10.10.10.1worker2 = 10.10.10.2(worker1和worker2在不同的行中.)
worker1=10.10.10.1worker2=10.10.10.2(both worker1 and worker2 in different lines.)
虽然读取worker1时执行没有问题.但是,当文件位于第2行-worker2时,代码在字符串malloc期间给出了分段错误.
你能帮我这个忙吗?
While reading worker1 there is no problem in the execution. However, when the file is at line 2 - worker2, the code gives segmentation fault during malloc of string.
Can you please help me with this.
推荐答案
strcpy(temp->ip_Address, ch);
u应该在strcpy之前先分配temp-> ip_address
u should malloc temp->ip_address before strcpy
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