mailing list of musl libc

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 #include <signal.h>
#include <string.h>

int sig2str(int sig, char *str)
{
	if (sig <= 0) return -1;

	if (sig <= SIGSYS)
		return (strcpy(str, __sys_signame[sig]), 0);

	if (sig == SIGRTMIN)
		return (strcpy(str, "RTMIN"), 0);
	if (sig == SIGRTMAX)
		return (strcpy(str, "RTMAX"), 0);

	if (sig > SIGRTMIN && sig <= SIGRTMAX)
	{
		strcpy(str, "RTMIN+");
		int sigrt = sig-SIGRTMIN;

		char *s = str+6;
		if (sigrt>=10)
		{
			*s++ = '0' + sigrt/10;
			sigrt %= 10;
		}
		*s++ = '0' + sigrt;
		*s = '\0';

		return 0;
	}

	return -1;
}