我有一个应用程序,该应用程序在空中更新期间从s3存储桶下载文件。当我直接从命令行运行代码时,我可以在应用程序目录中看到下载的文件,该文件由我的代码拾取以执行固件更新。但是,当我将代码作为服务运行时,即使调用成功,也看不到下载的文件。我正在使用下面简化的代码来确定问题所在。
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <pthread.h>
#include <sched.h>
#include <semaphore.h>
const char* url = "wget https://xxxxxxxx-xxxxxxx-xxxxxxxxxxxx-xx.s3.us-east 2.amazonaws.com/firmware.bin";
int main ()
{
system((const char*)url);
}
直接从命令行运行以上命令会产生以下结果。您可以在目录中看到firmware.bin。
debian@beaglebone:~/downloadTest$ sudo ./test
HTTP request sent, awaiting response... 200 OK
Length: 131072 (128K) [application/octet-stream]
Saving to: ‘firmware.bin’
firmware.bin 100%
2019-12-08 20:36:03 (6.21 KB/s) - ‘firmware.bin’ saved [131072/131072]
debian@beaglebone:~/downloadTest$ ls -l
total 144
-rw-r--r-- 1 root root 131072 Dec 4 19:11 firmware.bin
-rwxr-xr-x 1 debian debian 8384 Dec 8 20:12 test
-rw-r--r-- 1 debian debian 354 Dec 8 20:00 test.c
现在,当我运行与服务相同的程序时,在目录中看不到下载的文件。但是,当我检查该服务的状态时,它显示以下内容,这表示呼叫已通过且该文件确实已下载,实际上是我第9次尝试。
debian@beaglebone:~$ sudo systemctl status beaSmart.service
[sudo] password for debian:
● beaSmart.service - BeaSmart Service
Loaded: loaded (/etc/systemd/system/beaSmart.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Sun 2019-12-08 19:43:52 UTC; 59min ago
Process: 3474 ExecStart=/home/debian/downloadTest/test (code=exited, status=0/SUCCESS)
Main PID: 3474 (code=exited, status=0/SUCCESS)
Dec 08 19:43:32 beaglebone test[3474]: HTTP request sent, awaiting response... 200 OK
Dec 08 19:43:32 beaglebone test[3474]: Length: 131072 (128K) [application/octet-stream]
Dec 08 19:43:32 beaglebone test[3474]: Saving to: ‘firmware.bin.9’
Dec 08 19:43:41 beaglebone test[3474]: 0K .......... .......... ..........
.......... .......... 39% 5.33K 15s
Dec 08 19:43:50 beaglebone test[3474]: 50K .......... .......... ..........
.......... .......... 78% 6.09K 5s
Dec 08 19:43:52 beaglebone test[3474]: 100K .......... .......... ........
100% 9.95K=20s
Dec 08 19:43:52 beaglebone test[3474]: 2019-12-08 19:43:52 (6.27 KB/s) -
‘firmware.bin.9’ saved [131072/131072]
关于文件firmware.bin.9保存在哪里的任何见解?。为什么不将其保存在应用程序目录中?
解决方案:
debian@beaglebone:~/downloadTest$ sudo cat /etc/systemd/system/beaSmart.service
[Unit]
Description=BeaSmart Service
[Service]
User=root
Type=simple
WorkingDirectory=/home/debian/downloadTest
ExecStart=/home/debian/downloadTest/test
[Install]
WantedBy=multi-user.target
我有一个应用程序,该应用程序在空中更新期间从s3存储桶下载文件。当我直接从命令行运行代码时,可以在...
默认情况下,wget在运行它的当前工作目录中下载文件。