ref: b7bbf17028b775ba74b83871b7cefa2b1ce46ab9
dir: /sys/src/libc/port/perror.c/
#include <u.h>
#include <libc.h>
void
perror(char *s)
{
	char buf[ERRMAX];
	buf[0] = '\0';
	errstr(buf, sizeof buf);
	if(s && *s)
		fprint(2, "%s: %s\n", s, buf);
	else
		fprint(2, "%s\n", buf);
}