call to ‘fprintf’ from within signal handler [CWE-479] [-Wanalyzer-unsafe-call-within-signal-handler]
13 fprintf(stderr, "LOG: %s", msg); /* { dg-warning "call to 'fprintf' from within signal handler" } */
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main
main: events 1-2
21 int main(int argc, const char *argv)
^~~~
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(1) entry to ‘main’
[...]
25 signal(SIGINT, handler); /* { dg-message "registering 'handler' as signal handler" } */
~~~~~~~~~~~~~~~~~~~~~~~
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(2) registering ‘handler’ as signal handler
event 3
cc1: (3): later on, when the signal is delivered to the process
handler
handler: events 4-5
16 static void handler(int signum)
^~~~~~~
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(4) entry to ‘handler’
17 {
18 custom_logger("got signal");
~~~~~~~~~~~~~~~~~~~~~~~~~~~
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(5) calling ‘custom_logger’ from ‘handler’
custom_logger
custom_logger: events 6-7
11 void custom_logger(const char *msg)
^~~~~~~~~~~~~
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(6) entry to ‘custom_logger’
12 {
13 fprintf(stderr, "LOG: %s", msg); /* { dg-warning "call to 'fprintf' from within signal handler" } */
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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(7) ⚠️ call to ‘fprintf’ from within signal handler