我的当前项目有问题。
这是我的标题:
#define SHARED_MEMORY_NAME "/osmpmemory"
#define OSMP_MAX_MESSAGES_PROC 16
#define OSMP_MAX_SLOTS 256
#define OSMP_MAX_PAYLOAD_LENGTH 128
typedef struct {
char msg[OSMP_MAX_PAYLOAD_LENGTH];
} osmp_msg;
typedef struct {
size_t memory_size;
int process_count;
osmp_msg slots[OSMP_MAX_SLOTS];
} shm_conf;
这是我的代码:
shm_conf* memory_conf;
size_t shm_size = sizeof(shm_conf) + sizeof(int[count][2]) + sizeof(osmp_msg[count][OSMP_MAX_MESSAGES_PROC]);
int fd;
if((fd = shm_open(SHARED_MEMORY_NAME, O_CREAT | O_RDWR, 0640)) == -1) {
return -1;
}
if(ftruncate(fd, shm_size) == -1) {
printf("%s\n", strerror(errno));
return -1;
}
if((memory_conf = (shm_conf*)mmap(NULL, shm_size , PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
printf("%s\n", strerror(errno));
return 0;
}
memory_conf->process_count = count;
memory_conf->memory_size = shm_size;
int process_numbers[memory_conf->process_count][2];
for(int i = 0; i < memory_conf->process_count; i++) {
process_numbers[i][0] = 0;
process_numbers[i][1] = i;
}
memcpy(memory_conf + sizeof(shm_conf), process_numbers, sizeof(process_numbers));
我想在shm_conf结构之后存储一个二维数组。但memcpy给了我一个分段错误,我不知道为什么,你能帮助我吗?
在这个数组之后,我想存储另一个数组,这就是为什么shm_size比我当前需要的更大。
答案 0 :(得分:3)
错误可能是$File1 = "C:\Scripts\Txt1.txt"
$File2 = "C:\Scripts\Txt2.txt"
$Location = "C:\Scripts\Txt3.txt"
compare-object (get-content $File1) (get-content $File2) | format-list | Out-File $Location
调用中的指针算术。
memcpy
memcpy(memory_conf + sizeof(shm_conf), process_numbers, sizeof(process_numbers));
已经是memory_conf
指针,因此递增shm_conf
。该行应更改为:
sizeof(shm_conf)
避免复制到尚未分配的内存