1explain_pread_or_die(3)    Library Functions Manual    explain_pread_or_die(3)
2
3
4

NAME

6       explain_pread_or_die  - seek and read from a file descriptor and report
7       errors
8

SYNOPSIS

10       #include <libexplain/pread.h>
11       ssize_t explain_pread_or_die(int fildes, void *data, size_t  data_size,
12       off_t offset);
13       ssize_t   explain_pread_on_error(int   fildes,   void   *data,   size_t
14       data_size, off_t offset))
15

DESCRIPTION

17       The explain_pread_or_die function is used to call the  pread(2)  system
18       call.  On  failure  an  explanation will be printed to stderr, obtained
19       from the explain_pread(3) function, and then the process terminates  by
20       calling exit(EXIT_FAILURE).
21
22       The explain_pread_on_error function is used to call the pread(2) system
23       call. On failure an explanation will be  printed  to  stderr,  obtained
24       from the explain_pread(3) function, but still returns to the caller.
25
26       fildes  The  fildes,  exactly  as  to  be passed to the pread(2) system
27               call.
28
29       data    The data, exactly as to be passed to the pread(2) system call.
30
31       data_size
32               The data_size, exactly as to be passed to the  pread(2)  system
33               call.
34
35       offset  The  offset,  exactly  as  to  be passed to the pread(2) system
36               call.
37

RETURN VALUE

39       The explain_pread_or_die function only returns on success, see pread(2)
40       for  more  information. On failure, prints an explanation and exits, it
41       does not return.
42
43       The explain_pread_on_error function always returns the value return  by
44       the wrapped pread(2) system call.
45

EXAMPLE

47       The  explain_pread_or_die  function is intended to be used in a fashion
48       similar to the following example:
49              ssize_t result = explain_pread_or_die(fildes, data, data_size, offset);
50

SEE ALSO

52       pread(2)
53               read from a file descriptor at a given offset
54
55       explain_pread(3)
56               explain pread(2) errors
57
58       exit(2) terminate the calling process
59

61       libexplain version 0.40
62       Copyright (C) 2009 Peter Miller
63
64
65
66                                                       explain_pread_or_die(3)
Impressum