如何在qnx上获取进程内存

时间:2016-04-04 12:04:08

标签: c qnx qnx-neutrino

我想在qnx上获取进程内存。在shell上,我可以使用命令showmem -P pid获取结果。在c中我为命令打开一个管道,但后来我想解析命令的输出,但我不知道它是如何完成的。

int main()
{ 
    pid_t self;
    FILE *fp;
    char *command;
    self=getpid();

    sprintf(command,"showmem -P %d",self);
    fp = popen(command,"r");
    // Then I want to read the elements that results from this command line
}

1 个答案:

答案 0 :(得分:2)

你对popen和showmem的想法是可行的。您只需要解析popen()中的结果,以便提取内存信息。

以下是一个示例,假设您没有共享对象:

int main(int argc, char *argv[]) {
    pid_t self;
    FILE *fp;
    char command[30];
    const int MAX_BUFFER = 2048;
    char buffer[MAX_BUFFER];
    char* p;
    char* delims = { " ," };
    int memory[] = {-1, -1, -1, -1, -1 };
    int valueindex = -1;
    int parserindex = 0;
    self = getpid();
    sprintf(command, "showmem -P %d", self);

    fp = popen(command, "r");
    if (fp) {
        while (!feof(fp)) {
            if (fgets(buffer, MAX_BUFFER, fp) != NULL) {
                p = strtok( buffer, delims );
                while (p != NULL) {
                    if (parserindex >=8 && parserindex <= 13) {
                        memory[++valueindex] = atoi(p);
                    }
                    p = strtok(NULL, delims);
                    parserindex +=1;
                }
            }
        }
        pclose(fp);
    }

    printf("Memory Information:\n");
    printf("Total: %i\n", memory[0]);
    printf("Code: %i\n", memory[1]);
    printf("Data: %i\n", memory[2]);
    printf("Heap: %i\n", memory[3]);
    printf("Stack: %i\n", memory[4]);
    printf("Other: %i\n", memory[5]);
    return EXIT_SUCCESS;
}

该程序生成以下输出:

Memory Information:
Total: 851968
Code: 741376
Data: 24576
Heap: 73728
Stack: 12288
Other: 0