dummy_read.c

[詳解]

/*++
/* NAME
/*  dummy_read 3
/* SUMMARY
/*  dummy read operation
/* SYNOPSIS
/*  #include <iostuff.h>
/*
/*  ssize_t dummy_read(fd, buf, buf_len, timeout, context)
/*  int fd;
/*  void    *buf;
/*  size_t  len;
/*  int timeout;
/*  void    *context;
/* DESCRIPTION
/*  dummy_read() reports an EOF condition without side effects.
/*
/*  Arguments:
/* .IP fd
/*  File descriptor whose value is logged when verbose logging
/*  is turned on.
/* .IP buf
/*  Read buffer pointer. Not used.
/* .IP buf_len
/*  Read buffer size. Its value is logged when verbose logging is
/*  turned on.
/* .IP timeout
/*  The deadline in seconds. Not used.
/* .IP context
/*  Application context. Not used.
/* DIAGNOSTICS
/*  None.
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>

/* Utility library. */

#include <msg.h>
#include <iostuff.h>

/* dummy_read - dummy read operation */

ssize_t dummy_read(int fd, void *unused_buf, size_t len,
                   int unused_timeout, void *unused_context)
{
    if (msg_verbose)
    msg_info("dummy_read: fd %d, len %lu", fd, (unsigned long) len);
    return (0);
}