HP-UX下获取进程信息的常用方法

在HP-UX操作系统中，获取进程信息是一项常见的操作，不同的情况需要采用不同的方法。本示例代码主要介绍了HP-UX下获取进程信息的常用方法，包括获取进程ID、进程名、进程状态等信息，并提供了对应的代码实现。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/procfs.h>
#include <fcntl.h>

#define BUFFER_SIZE 1024

/* 根据进程ID获取进程名 */
void get_process_name(int pid, char* process_name)
{
    char filename[BUFFER_SIZE];
    sprintf(filename, "/proc/%d/status", pid);
    FILE* fp = fopen(filename, "r");
    if (fp == NULL)
    {
        sprintf(process_name, "unknown");
        return;
    }
    char line[BUFFER_SIZE];
    while (fgets(line, BUFFER_SIZE, fp))
    {
        if (strncmp(line, "Name:", 5) == 0)
        {
            sscanf(line+6, "%s", process_name);
            break;
        }
    }
    fclose(fp);
}

/* 根据进程ID获取进程状态 */
int get_process_state(int pid)
{
    char filename[BUFFER_SIZE];
    sprintf(filename, "/proc/%d/status", pid);
    FILE* fp = fopen(filename, "r");
    if (fp == NULL)
    {
        return -1;
    }
    char line[BUFFER_SIZE];
    int state = 0;
    while (fgets(line, BUFFER_SIZE, fp))
    {
        if (strncmp(line, "State:", 6) == 0)
        {
            char state_char;
            sscanf(line+7, "%c", &state_char);
            switch (state_char)
            {
                case 'R':
                    state = 1;  // 运行状态
                    break;
                case 'S':
                    state = 2;  // 睡眠状态
                    break;
                case 'Z':
                    state = 3;  // 僵死状态
                    break;
                default:
                    state = 0;  // 其他状态
                    break;
            }
            break;
        }
    }
    fclose(fp);
    return state;
}

/* 根据进程名获取进程ID */
int get_process_id(const char* process_name)
{
    int pid = -1;
    DIR* dir = opendir("/proc");
    if (dir == NULL)
    {
        return -1;
    }
    struct dirent* dp;
    while ((dp = readdir(dir)) != NULL)
    {
        if (isdigit(dp->d_name[0]))
        {
            int cur_pid = atoi(dp->d_name);
            char cur_process_name[BUFFER_SIZE];
            get_process_name(cur_pid, cur_process_name);
            if (strcmp(cur_process_name, process_name) == 0)
            {
                pid = cur_pid;
                break;
            }
        }
    }
    closedir(dir);
    return pid;
}

int main()
{
    int pid = getpid();  // 获取当前进程ID
    char process_name[BUFFER_SIZE];
    get_process_name(pid, process_name);
    printf("当前进程名：%s\n", process_name);

    int state = get_process_state(pid);
    printf("当前进程状态：%d\n", state);

    pid = get_process_id("vim");
    printf("vim进程ID：%d\n", pid);

    return 0;
}

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