linux c获取进程内存

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void get_memory_usage(pid_t pid) {
    char path[64];
    char buffer[128];
    FILE *statusf;

    snprintf(path, sizeof(path), "/proc/%d/status", pid);

    if ((statusf = fopen(path, "r")) == NULL) {
        perror("fopen");
        return;
    }

    while (fgets(buffer, sizeof(buffer), statusf)) {
        if (strncmp(buffer, "VmSize:", 7) == 0 || strncmp(buffer, "VmRSS:", 6) == 0) {
            printf("%s", buffer);
        }
    }

    fclose(statusf);
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <pid>\n", argv[0]);
        return 1;
    }

    pid_t pid = atoi(argv[1]);
    get_memory_usage(pid);

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/sysinfo.h>
#include <sys/time.h>
#include <sys/resource.h>

void print_memory_usage(pid_t pid) {
    struct rusage usage;
    if (getrusage(pid, &usage) == -1) {
        perror("getrusage");
        return;
    }

    printf("Memory usage for PID %d:\n", pid);
    printf("  User CPU time used: %ld.%06ld seconds\n", usage.ru_utime.tv_sec, usage.ru_utime.tv_usec);
    printf("  System CPU time used: %ld.%06ld seconds\n", usage.ru_stime.tv_sec, usage.ru_stime.tv_usec);
    printf("  Max resident set size: %ld KB\n", usage.ru_maxrss);
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <pid>\n", argv[0]);
        return 1;
    }

    pid_t pid = atoi(argv[1]);
    print_memory_usage(pid);

    return 0;
}