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Annotation of 42BSD/lib/libc/gen/perror.c, revision 1.1

1.1     ! root        1: /* @(#)perror.c        4.2 (Berkeley) 6/30/83 */
        !             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: }

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