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Top Forums Programming need help about get errno [ENXIO] for mmap Post 302568101 by jim mcnamara on Wednesday 26th of October 2011 08:17:57 AM
Old 10-26-2011
/bin/ls is a regular file, the ENXIO error usually arises on devices like tty's which are character sepcial files. Normally len should be the result of a stat() call, struct stat st_size for /bin/ls in this case, because you are reading a regular file.
 

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explain_stat_or_die(3)					     Library Functions Manual					    explain_stat_or_die(3)

NAME
explain_stat_or_die - get file status and report errors SYNOPSIS
#include <libexplain/stat.h> void explain_stat_or_die(const char *pathname, struct stat *buf); DESCRIPTION
The explain_stat_or_die function is used to call the stat(2) system call. On failure an explanation will be printed to stderr, obtained from explain_stat(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_stat_or_die(pathname, buf); pathname The pathname, exactly as to be passed to the stat(2) system call. buf The buf, exactly as to be passed to the stat(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
stat(2) get file status explain_stat(3) explain stat(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_stat_or_die(3)
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