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The OpenBSD signal() man page list a few additional functions that are asynchronous-safe in OpenBSD but "probably not on other systems" including: snprintf(), vsnprintf(), and syslog_r() (but only when the syslog_data struct is initialized as a local variable).
...
Compliant
...
Solution
...
Signal
...
handlers
...
should
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be
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as
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concise
...
as
...
possible,
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ideally
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unconditionally
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setting
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a
...
flag
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and
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returning.
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They
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may
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also
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call
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the
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_Exit()
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function.
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|---|---|---|---|---|
| =
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}
#include <signal.h>
void int_handler() {
_Exit(0);
}
int main(void) {
char *foo = (char *)malloc(sizeof("Hello World."));
if (foo == NULL) {
/* handle error condition */
}
signal(SIGINT, int_handler);
strcpy(foo, "Hello World.");
puts(foo);
free(foo);
return 0;
}
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...