error.c.save

unix环境高级编程的源代码

#include    <errno.h>        /* for definition of errno */
#include    <stdarg.h>        /* ANSI C header file */
#include    <stdio.h>
#include    <stdlib.h>
#include    <string.h>        /* for strerror() */
#include    "ourhdr.h"

char    *pname = NULL;        /* caller can set this from argv[0] */

/* Recoverable error.  Print a message based on the system's
 * errno value, and return to caller.
 */

/* $[err_ret]~function$ */
void
err_ret(const char *fmt, ...)
{
    va_list        ap;
    int            errno_save;

    errno_save = errno;        /* value caller wants printed */
    fflush(stdout);
    va_start(ap, fmt);
    if (pname != NULL)
        fprintf(stderr, "%s: ", pname);
    vfprintf(stderr, fmt, ap);
    va_end(ap);

    fprintf(stderr, ": %s\n", strerror(errno_save));
    fflush(stderr);

    return;
}

/* Fatal error related to a system call.  Print a message and terminate.
 * Don't dump core, but do print the system's errno value and its
 * associated message.
 */

/* $[err_sys]~function$ */
void
err_sys(const char *fmt, ...)
{
    va_list        ap;
    int            errno_save;

    errno_save = errno;        /* value caller wants printed */
    fflush(stdout);
    va_start(ap, fmt);
    if (pname != NULL)
        fprintf(stderr, "%s: ", pname);
    vfprintf(stderr, fmt, ap);
    va_end(ap);

    fprintf(stderr, ": %s\n", strerror(errno_save));
    fflush(stderr);

    exit(1);
}

/* Fatal error.  Print a message, dump core (for debugging) and terminate.
 */

/* $[err_dump]~function$ */
void
err_dump(const char *fmt, ...)
{
    va_list        ap;
    int            errno_save;

    errno_save = errno;        /* value caller wants printed */
    fflush(stdout);
    va_start(ap, fmt);
    if (pname != NULL)
        fprintf(stderr, "%s: ", pname);
    vfprintf(stderr, fmt, ap);
    va_end(ap);

    fprintf(stderr, ": %s\n", strerror(errno_save));
    fflush(stderr);

    abort();        /* dump core and terminate */
    exit(1);        /* shouldn't get here */
}

/* Recoverable error.  Print a message, and return to caller.
 * The system's errno value is not printed.
 */

/* $[err_msg]~function$ */
void
err_msg(const char *fmt, ...)
{
    va_list        ap;

    fflush(stdout);
    va_start(ap, fmt);
    if (pname != NULL)
        fprintf(stderr, "%s: ", pname);
    vfprintf(stderr, fmt, ap);
    va_end(ap);

    fflush(stderr);

    return;
}

/* Fatal error.  Print a message and terminate.
 * Don't dump core and don't print the system's errno value.
 */

/* $[err_quit]~function$ */
void
err_quit(const char *fmt, ...)
{
    va_list        ap;

    va_start(ap, fmt);
    if (pname != NULL)
        fprintf(stderr, "%s: ", pname);
    vfprintf(stderr, fmt, ap);
    putc('\n', stderr);
    va_end(ap);

    exit(1);
}