ref: f58d99aa7a97ba5f79af89f38b78d5924d4e35a2
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); }