explain_pread_or_die(3) Library Functions Manual explain_pread_or_die(3) NAME explain_pread_or_die - seek and read from a file descriptor and report er- rors SYNOPSIS #include <libexplain/pread.h> ssize_t explain_pread_or_die(int fildes, void *data, size_t data_size, off_t offset); ssize_t explain_pread_on_error(int fildes, void *data, size_t data_size, off_t offset)) DESCRIPTION The explain_pread_or_die function is used to call the pread(2) system call. On failure an explanation will be printed to stderr, obtained from the ex- plain_pread(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_pread_on_error function is used to call the pread(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_pread(3) function, but still returns to the caller. fildes The fildes, exactly as to be passed to the pread(2) system call. data The data, exactly as to be passed to the pread(2) system call. data_size The data_size, exactly as to be passed to the pread(2) system call. offset The offset, exactly as to be passed to the pread(2) system call. RETURN VALUE The explain_pread_or_die function only returns on success, see pread(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_pread_on_error function always returns the value return by the wrapped pread(2) system call. EXAMPLE The explain_pread_or_die function is intended to be used in a fashion simi- lar to the following example: ssize_t result = explain_pread_or_die(fildes, data, data_size, offset); SEE ALSO pread(2) read from a file descriptor at a given offset explain_pread(3) explain pread(2) errors exit(2) terminate the calling process COPYRIGHT libexplain version 1.3 Copyright (C) 2009 Peter Miller explain_pread_or_die(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLE | SEE ALSO | COPYRIGHT
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