Does the POSIX standard or another C standard provide a way to recover a meaningful message from a signal number, in the same way that strerror()
makes it possible to recover a message from errno
? The Gnu C library has strsignal()
, but if possible, I would like something portable to BSD and other Unix variants.
Yes, interestingly, there is a standard way to get a string message from a signal in POSIX. It is, quite coincidentally, strsignal()
. From POSIX.1-2008:
The strsignal() function shall map the signal number in signum to an implementation-defined string and shall return a pointer to it. It shall use the same set of messages as the psignal() function.
An environment that does not provide you this function is not POSIX-compliant. Although relatively new (Issue 7 came out in 2008), I have a man page for strsignal()
on Mac OS X , so that's a good sign.
The externally defined array sys_siglist
contains the signal descriptions for each signal number, and is standard issue on BSD.
#include <signal.h>
extern const char *const sys_siglist[];
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