用C语言在Linux上获取程序进程(服务和守护进程)

#include<stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include<string.h>
#include <sys/types.h>
#include <unistd.h>

int main() {
    DIR *proc_dir;
    struct dirent *entry;

    proc_dir = opendir("/proc");
    if (proc_dir == NULL) {
        perror("Failed to open /proc directory");
        return 1;
    }

    while ((entry = readdir(proc_dir)) != NULL) {
        if (entry->d_type == DT_DIR) {
            int pid = atoi(entry->d_name);
            if (pid > 0) {
                printf("PID: %d\n", pid);
            }
        }
    }

    closedir(proc_dir);
    return 0;
}

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

int main() {
    int pid = getpid();
    char path[256];
    FILE *file;

    snprintf(path, sizeof(path), "/proc/%d/status", pid);
    file = fopen(path, "r");
    if (file == NULL) {
        perror("Failed to open status file");
        return 1;
    }

    char line[256];
    while (fgets(line, sizeof(line), file) != NULL) {
        printf("%s", line);
    }

    fclose(file);
    return 0;
}

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

int main() {
    int pid = getpid();
    char path[256];
    FILE *file;

    snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
    file = fopen(path, "r");
    if (file == NULL) {
        perror("Failed to open cmdline file");
        return 1;
    }

    char arg[256];
    while (fgets(arg, sizeof(arg), file) != NULL) {
        printf("%s", arg);
    }

    fclose(file);
    return 0;
}

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

int main() {
    int pid = getpid();
    char path[256];
    FILE *file;

    snprintf(path, sizeof(path), "/proc/%d/environ", pid);
    file = fopen(path, "r");
    if (file == NULL) {
        perror("Failed to open environ file");
        return 1;
    }

    char env[256];
    while (fgets(env, sizeof(env), file) != NULL) {
        printf("%s", env);
    }

    fclose(file);
    return 0;
}