[英]fprintf causing Segmentation Fault in C
錯誤行在底部function的最后幾行找到。 我已將錯誤范圍縮小到 fprintf 行,我知道 SEG FAULT 並非巧合地與這些代碼行對齊,並且實際上是另一個線程導致了問題,因為我通過使用 sleep function 在不同的時間間隔,以便通過在考慮手動設置的時間間隔的情況下估計何時發生 SEG FAULT 來驗證錯誤來源。 瞧,如果我使用 sleep(3) 而不是 Caps 中的注釋,則 SEG FAULT 會在 3 秒后出現。
測試輸入和緩沖區,即“buffer”,因此包含“:create rosemary 10 password”
結構定義:
typedef struct {
struct sockaddr_in addr;
int sock_fd;
char name[16];
time_t time_since_last_msg;
room *current_room;
} client;
Function:
void create_new_room(client* cli, char buffer[]) {
pthread_mutex_lock(&mutex);
printf("START create_new_room()\n");
char room_name[16], password[16], *token;
int capacity;
room *new_room = malloc(sizeof(new_room));
pthread_t tid;
FILE *rooms = NULL;
if((rooms = fopen("room-info.txt", "a")) == NULL) {
perror("Failed to open file.");
exit(-1);
}
token = strtok(buffer, " ");
token = strtok(NULL, " ");
strcpy(room_name, token);
token = strtok(NULL, " ");
capacity = atoi(token);
token = strtok(NULL, " ");
strcpy(password, token);
FD_ZERO(&(new_room->write_set));
strcpy(new_room->room_name, room_name);
new_room->room_id = ++natural_id;
add_room(new_room);
sleep(3);
// WTF IS GOING ON HERE?!?!?!
fprintf(rooms, "%s\n", room_name);
fprintf(rooms, "id=%u\n", natural_id);
fprintf(rooms, "owner=%s\n", cli->name);
fprintf(rooms, "capacity=%d\n", capacity);
fprintf(rooms, "pass=%s\n\n", password);
線
room *new_room = malloc(sizeof(new_room));
是錯的。 您只為指針分配空間,而結構則需要空間。
它應該是
room *new_room = malloc(sizeof(*new_room));
或者
room *new_room = malloc(sizeof(room));
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