ref: 653d8ba5e8543d0a57d186e69621a5cdeb919f3f
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);
}