c - 用C程序查找HP-UX上的进程使用的虚拟内存？

Question

在采访中我问了这个问题：


编写一个简单的C程序，以查找UNIX（HP-UX）上正在运行的进程使用的虚拟内存


我告诉他们我不确定，但也提出了一些想法，例如：


可能是我们可以使用getpid系统调用获取进程ID，并将其与stat结合使用并获取所需的输出
或者可能是我们可以运行system函数调用，并且可以在其中使用ps这样的shell命令并获取详细信息。


也许我不正确；有人可以帮我吗？

Answer 1

您可以在HP / UX上使用pstat_getprocvm功能来了解进程的虚拟内存布局。

取自here的示例

#ifdef PS_RSESTACK      /* 11.22 and later */
#define LAST_VM_TYPE    PS_RSESTACK
#else               /* prior non-IPF */
#define LAST_VM_TYPE    PS_GRAPHICS_DMA
#endif              /* PS_RSESTACK */

uint32_t virt_totals[LAST_VM_TYPE + 1];
uint32_t phys_totals[LAST_VM_TYPE + 1];
uint32_t swap_totals[LAST_VM_TYPE + 1];
uint32_t mlock_totals[LAST_VM_TYPE + 1];

void print_type(int type)
{
    switch (type) {
    case PS_USER_AREA:
      printf(" UAREA ");
      return;
    case PS_TEXT:
      printf(" TEXT ");
      return;
    case PS_DATA:
      printf(" DATA/HEAP ");
      return;
    case PS_STACK:
      printf(" MAIN STACK ");
      return;
#ifdef PS_RSESTACK
      case PS_RSESTACK:
      printf(" RSE STACK ");
    return;
#endif              /* PS_RSESTACK */
    case PS_IO:
      printf(" MEM MAPPED I/O ");
    return;
      case PS_SHARED_MEMORY:
    printf(" SYSV SHMEM ");
    return;
    case PS_NULLDEREF:
    printf(" NULL DEREF ");
    return;
    case PS_MMF:
    printf(" MMAP ");
    return;
    case PS_GRAPHICS:
    case PS_GRAPHICS_DMA:
      printf(" GRAPHICS SPECIFIC ");
      return;
    default:
      printf(" UNUSED TYPE ");
    }
    return;
}

int main(int argc, char *argv[])
{
    int error;
    struct pst_vm_status pvs;
    struct pst_status ps;
    int i, j, k, verbose, get_all;
    pid_t target;
    int valid = 0;
    size_t sys_page_size;
    int done = 0;
    size_t count;
    _T_LONG_T last_pid = -1;

    verbose = 0;
    target = 0;
    get_all = 0;

    if (argc > 3) {
      printf("USAGE: %s <-v> \n", argv[0]);
    }

    if (argc == 2) {
      target = atoi(argv[1]);
    } else if (argc == 3) {
      verbose = 1;
      target = atoi(argv[2]);
    } else {
      get_all = 1;
    }

    sys_page_size = sysconf(_SC_PAGE_SIZE);

    j = 0;

    printf("VIRT/PHYS/LOCKED/SWAP summaries in pages.\n");
    printf("System page size is %ld or 0x%lx bytes.\n",
       sys_page_size, sys_page_size);

    do {
    if (get_all) {
        target = j++;
        count = (size_t) 1;
    } else {
        count = 0;
    }
   done = (pstat_getproc(&ps, sizeof(struct pst_status),
                  count, target) <= 0);
    if (done) {
        break;
    }

    if (ps.pst_pid == last_pid) {
        continue;
    }

    last_pid = ps.pst_pid;

    for (k = 0; k <= LAST_VM_TYPE; k++) {
        virt_totals[k] = 0;
        phys_totals[k] = 0;
        swap_totals[k] = 0;
        mlock_totals[k] = 0;
    }

    i = 0;
    while (pstat_getprocvm(&pvs, sizeof(struct pst_vm_status),
                   (size_t) ps.pst_pid, i++) > 0) {

        valid = 1;

        if (verbose) {
        printf("Object %d: ", i);
        print_type(pvs.pst_type);
        printf(" at VA 0x%lx to VA 0x%lx.\n\t",
               pvs.pst_vaddr,
               pvs.pst_vaddr +
               (pvs.pst_length * sys_page_size) - 1);
        printf("\tVIRT: %ld \tPHYS: %ld \tLOCKED:"
               " %ld\tSWAP: %ld \n",
               pvs.pst_length, pvs.pst_phys_pages,
               pvs.pst_lockmem, pvs.pst_swap);
        }
        virt_totals[pvs.pst_type] += pvs.pst_length;
        phys_totals[pvs.pst_type] += pvs.pst_phys_pages;
        swap_totals[pvs.pst_type] += pvs.pst_swap;
        mlock_totals[pvs.pst_type] += pvs.pst_lockmem;
    }

    if (valid) {
        printf("PID %ld:\n", ps.pst_pid);
    }
 for (k = 0; k <= LAST_VM_TYPE && valid; k++) {
        print_type(k);
        printf(" consumes %ld VIRT, %ld PHYS, %ld LOCKED"
           " and %ld SWAP.\n",
           virt_totals[k], phys_totals[k], mlock_totals[k],
           swap_totals[k]);
        virt_totals[k] = 0;
        phys_totals[k] = 0;
        mlock_totals[k] = 0;
        swap_totals[k] = 0;
    }
    valid = 0;
    } while (get_all);

    exit(0);