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curl crashes when internet switched off

From: Salman Ahmed via curl-library <curl-library_at_cool.haxx.se>
Date: Wed, 4 Sep 2019 16:22:54 +0500

Hello,

I am facing this problem where my application just terminates when I
manually switch off my WiFi while it is waiting on curl_easy_perform() in a
separate thread from the main thread.

Thread 4 "my-app" received signal SIGPIPE, Broken pipe.
[Switching to Thread 0x7fffebfff700 (LWP 27283)]
0x00007ffff75364bd in write () at ../sysdeps/unix/syscall-template.S:84
84 ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) backtrace
#0 0x00007ffff75364bd in write () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007ffff6772455 in ?? () from
/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
#2 0x00007ffff677047c in BIO_write () from
/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
#3 0x00007ffff6ac9bf2 in ?? () from /lib/x86_64-linux-gnu/libssl.so.1.0.0
#4 0x00007ffff6acbe13 in ?? () from /lib/x86_64-linux-gnu/libssl.so.1.0.0
#5 0x00007ffff6ac7a22 in ?? () from /lib/x86_64-linux-gnu/libssl.so.1.0.0
#6 0x00007ffff7bbb6e3 in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4
#7 0x00007ffff7b89717 in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4
#8 0x00007ffff7b8a12a in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4
#9 0x00007ffff7b9e99f in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4
#10 0x00007ffff7b9ef5d in curl_multi_perform () from
/usr/lib/x86_64-linux-gnu/libcurl.so.4
#11 0x00007ffff7b95a0b in curl_easy_perform () from
/usr/lib/x86_64-linux-gnu/libcurl.so.4
#12 0x0000000000405942 in my_curl_loop ()
#13 0x00007ffff752d6ba in start_thread (arg=0x7fffebfff700) at
pthread_create.c:333
#14 0x00007ffff726341d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

I see that in my_curl_loop() , I am successfully able to call
curl_easy_perform() and block there. But as soon as I switch off my
internet , my app terminates without even returning from curl_easy_perform.

Any one got any ideas?

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Received on 2019-09-04