explain_fstatvfs_or_die(3) [debian man page]
explain_fstatvfs_or_die(3) Library Functions Manual explain_fstatvfs_or_die(3) NAME
explain_fstatvfs_or_die - get file system statistics and report errors SYNOPSIS
#include <libexplain/fstatvfs.h> void explain_fstatvfs_or_die(int fildes, struct statvfs *data); int explain_fstatvfs_on_error(int fildes, struct statvfs *data); DESCRIPTION
The explain_fstatvfs_or_die function is used to call the fstatvfs(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_fstatvfs(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_fstatvfs_on_error function is used to call the fstatvfs(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_fstatvfs(3) function, but still returns to the caller. fildes The fildes, exactly as to be passed to the fstatvfs(2) system call. data The data, exactly as to be passed to the fstatvfs(2) system call. RETURN VALUE
The explain_fstatvfs_or_die function only returns on success, see fstatvfs(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_fstatvfs_on_error function always returns the value return by the wrapped fstatvfs(2) system call. EXAMPLE
The explain_fstatvfs_or_die function is intended to be used in a fashion similar to the following example: explain_fstatvfs_or_die(fildes, data); SEE ALSO
fstatvfs(2) get file system statistics explain_fstatvfs(3) explain fstatvfs(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_fstatvfs_or_die(3)
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explain_fstatvfs(3) Library Functions Manual explain_fstatvfs(3) NAME
explain_fstatvfs - explain fstatvfs(2) errors SYNOPSIS
#include <libexplain/fstatvfs.h> const char *explain_fstatvfs(int fildes, struct statvfs *data); const char *explain_errno_fstatvfs(int errnum, int fildes, struct statvfs *data); void explain_message_fstatvfs(char *message, int message_size, int fildes, struct statvfs *data); void explain_message_errno_fstatvfs(char *message, int message_size, int errnum, int fildes, struct statvfs *data); DESCRIPTION
These functions may be used to obtain explanations for errors returned by the fstatvfs(2) system call. explain_fstatvfs const char *explain_fstatvfs(int fildes, struct statvfs *data); The explain_fstatvfs function is used to obtain an explanation of an error returned by the fstatvfs(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. The errno global variable will be used to obtain the error value to be decoded. fildes The original fildes, exactly as passed to the fstatvfs(2) system call. data The original data, exactly as passed to the fstatvfs(2) system call. Returns: The message explaining the error. This message buffer is shared by all libexplain functions which do not supply a buffer in their argument list. This will be overwritten by the next call to any libexplain function which shares this buffer, including other threads. Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library. Example: This function is intended to be used in a fashion similar to the following example: if (fstatvfs(fildes, data) < 0) { fprintf(stderr, "%s ", explain_fstatvfs(fildes, data)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_fstatvfs_or_die(3) function. explain_errno_fstatvfs const char *explain_errno_fstatvfs(int errnum, int fildes, struct statvfs *data); The explain_errno_fstatvfs function is used to obtain an explanation of an error returned by the fstatvfs(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. errnum The error value to be decoded, usually obtained from the errno global variable just before this function is called. This is neces- sary if you need to call any code between the system call to be explained and this function, because many libc functions will alter the value of errno. fildes The original fildes, exactly as passed to the fstatvfs(2) system call. data The original data, exactly as passed to the fstatvfs(2) system call. Returns: The message explaining the error. This message buffer is shared by all libexplain functions which do not supply a buffer in their argument list. This will be overwritten by the next call to any libexplain function which shares this buffer, including other threads. Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library. Example: This function is intended to be used in a fashion similar to the following example: if (fstatvfs(fildes, data) < 0) { int err = errno; fprintf(stderr, "%s ", explain_errno_fstatvfs(err, fildes, data)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_fstatvfs_or_die(3) function. explain_message_fstatvfs void explain_message_fstatvfs(char *message, int message_size, int fildes, struct statvfs *data); The explain_message_fstatvfs function is used to obtain an explanation of an error returned by the fstatvfs(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. The errno global variable will be used to obtain the error value to be decoded. message The location in which to store the returned message. If a suitable message return buffer is supplied, this function is thread safe. message_size The size in bytes of the location in which to store the returned message. fildes The original fildes, exactly as passed to the fstatvfs(2) system call. data The original data, exactly as passed to the fstatvfs(2) system call. Example: This function is intended to be used in a fashion similar to the following example: if (fstatvfs(fildes, data) < 0) { char message[3000]; explain_message_fstatvfs(message, sizeof(message), fildes, data); fprintf(stderr, "%s ", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_fstatvfs_or_die(3) function. explain_message_errno_fstatvfs void explain_message_errno_fstatvfs(char *message, int message_size, int errnum, int fildes, struct statvfs *data); The explain_message_errno_fstatvfs function is used to obtain an explanation of an error returned by the fstatvfs(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. message The location in which to store the returned message. If a suitable message return buffer is supplied, this function is thread safe. message_size The size in bytes of the location in which to store the returned message. errnum The error value to be decoded, usually obtained from the errno global variable just before this function is called. This is neces- sary if you need to call any code between the system call to be explained and this function, because many libc functions will alter the value of errno. fildes The original fildes, exactly as passed to the fstatvfs(2) system call. data The original data, exactly as passed to the fstatvfs(2) system call. Example: This function is intended to be used in a fashion similar to the following example: if (fstatvfs(fildes, data) < 0) { int err = errno; char message[3000]; explain_message_errno_fstatvfs(message, sizeof(message), err, fildes, data); fprintf(stderr, "%s ", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_fstatvfs_or_die(3) function. SEE ALSO
fstatvfs(2) get file system statistics explain_fstatvfs_or_die(3) get file system statistics and report errors COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_fstatvfs(3)