1 /* @(#)perror.c 4.2 (Berkeley) 06/30/83 */ 2 /* 3 * Print the error indicated 4 * in the cerror cell. 5 */ 6 #include <sys/types.h> 7 #include <sys/uio.h> 8 9 int errno; 10 int sys_nerr; 11 char *sys_errlist[]; 12 perror(s) 13 char *s; 14 { 15 struct iovec iov[4]; 16 register struct iovec *v = iov; 17 18 if (s && *s) { 19 v->iov_base = s; 20 v->iov_len = strlen(s); 21 v++; 22 v->iov_base = ": "; 23 v->iov_len = 2; 24 v++; 25 } 26 v->iov_base = errno < sys_nerr ? sys_errlist[errno] : "Unknown error"; 27 v->iov_len = strlen(v->iov_base); 28 v++; 29 v->iov_base = "\n"; 30 v->iov_len = 1; 31 writev(2, iov, (v - iov) + 1); 32 } 33