linux c获取进程io

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

int main() {
    char path[64];
    char buffer[1024];
    FILE *file;
    long long read_bytes = 0, write_bytes = 0;

    // 获取当前进程ID
    pid_t pid = getpid();
    snprintf(path, sizeof(path), "/proc/%d/io", pid);

    // 打开/proc/pid/io文件
    file = fopen(path, "r");
    if (file == NULL) {
        perror("Failed to open /proc/pid/io");
        return 1;
    }

    // 读取read_bytes和write_bytes
    while (fgets(buffer, sizeof(buffer), file)) {
        if (strncmp(buffer, "read_bytes:", 12) == 0) {
            sscanf(buffer, "read_bytes: %lld", &read_bytes);
        } else if (strncmp(buffer, "write_bytes:", 13) == 0) {
            sscanf(buffer, "write_bytes: %lld", &write_bytes);
        }
    }

    fclose(file);

    printf("Process %d I/O statistics:\n", pid);
    printf("Read bytes: %lld\n", read_bytes);
    printf("Write bytes: %lld\n", write_bytes);

    return 0;
}