1explain_pread_or_die(3)    Library Functions Manual    explain_pread_or_die(3)
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NAME

6       explain_pread_or_die  - seek and read from a file descriptor and report
7       errors
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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))
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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).
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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.
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26       fildes  The  fildes,  exactly  as  to  be passed to the pread(2) system
27               call.
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29       data    The data, exactly as to be passed to the pread(2) system call.
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31       data_size
32               The data_size, exactly as to be passed to the  pread(2)  system
33               call.
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35       offset  The  offset,  exactly  as  to  be passed to the pread(2) system
36               call.
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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.
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43       The explain_pread_on_error function always returns the value return  by
44       the wrapped pread(2) system call.
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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);
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SEE ALSO

52       pread(2)
53               read from a file descriptor at a given offset
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55       explain_pread(3)
56               explain pread(2) errors
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58       exit(2) terminate the calling process
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61       libexplain version 1.4
62       Copyright (C) 2009 Peter Miller
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66                                                       explain_pread_or_die(3)
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