explain_closedir_or_die(3) [debian man page]
explain_closedir_or_die(3) Library Functions Manual explain_closedir_or_die(3) NAME
explain_closedir_or_die - close a directory and report errors SYNOPSIS
#include <libexplain/closedir.h> void explain_closedir_or_die(DIR *dir); DESCRIPTION
The explain_closedir_or_die function is used to call the closedir(3) system call. On failure an explanation will be printed to stderr, obtained from explain_closedir(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_closedir_or_die(dir); dir The dir, exactly as to be passed to the closedir(3) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
closedir(3) close a directory explain_closedir(3) explain closedir(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_closedir_or_die(3)
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explain_closedir(3) Library Functions Manual explain_closedir(3) NAME
explain_closedir - explain closedir(3) errors SYNOPSIS
#include <libexplain/closedir.h> const char *explain_closedir(DIR *dir); const char *explain_errno_closedir(int errnum, DIR *dir); void explain_message_closedir(char *message, int message_size, DIR *dir); void explain_message_errno_closedir(char *message, int message_size, int errnum, DIR *dir); DESCRIPTION
These functions may be used to obtain explanations for errors returned by the closedir(3) system call. explain_closedir const char *explain_closedir(DIR *dir); The explain_closedir function is used to obtain an explanation of an error returned by the closedir(3) 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. This function is intended to be used in a fashion similar to the following example: if (closedir(dir) < 0) { fprintf(stderr, "%s ", explain_closedir(dir)); exit(EXIT_FAILURE); } dir The original dir, exactly as passed to the closedir(3) 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. explain_errno_closedir const char *explain_errno_closedir(int errnum, DIR *dir); The explain_errno_closedir function is used to obtain an explanation of an error returned by the closedir(3) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail. This function is intended to be used in a fashion similar to the following example: if (closedir(dir) < 0) { int err = errno; fprintf(stderr, "%s ", explain_errno_closedir(err, dir)); exit(EXIT_FAILURE); } 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. dir The original dir, exactly as passed to the closedir(3) 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. explain_message_closedir void explain_message_closedir(char *message, int message_size, DIR *dir); The explain_message_closedir function may be used to obtain an explanation of an error returned by the closedir(3) 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. This function is intended to be used in a fashion similar to the following example: if (closedir(dir) < 0) { char message[3000]; explain_message_closedir(message, sizeof(message), dir); fprintf(stderr, "%s ", message); exit(EXIT_FAILURE); } 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. dir The original dir, exactly as passed to the closedir(3) system call. explain_message_errno_closedir void explain_message_errno_closedir(char *message, int message_size, int errnum, DIR *dir); The explain_message_errno_closedir function may be used to obtain an explanation of an error returned by the closedir(3) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail. This function is intended to be used in a fashion similar to the following example: if (closedir(dir) < 0) { int err = errno; char message[3000]; explain_message_errno_closedir(message, sizeof(message), err, dir); fprintf(stderr, "%s ", message); exit(EXIT_FAILURE); } 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. dir The original dir, exactly as passed to the closedir(3) system call. SEE ALSO
closedir(3) close a directory explain_closedir_or_die(3) close a directory and report errors COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_closedir(3)