explain_unlink_or_die(3) [debian man page]
explain_unlink_or_die(3) Library Functions Manual explain_unlink_or_die(3) NAME
explain_unlink_or_die - delete a file and report errors SYNOPSIS
#include <libexplain/unlink.h> void explain_unlink_or_die(const char *pathname); DESCRIPTION
The explain_unlink_or_die function is used to call the unlink(2) system call. On failure an explanation will be printed to stderr, obtained from explain_unlink(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_unlink_or_die(pathname); pathname The pathname, exactly as to be passed to the unlink(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
unlink(2) delete a name and possibly the file it refers to explain_unlink(3) explain unlink(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_unlink_or_die(3)
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explain_unlink(3) Library Functions Manual explain_unlink(3) NAME
explain_unlink - explain unlink(2) errors SYNOPSIS
#include <libexplain/unlink.h> const char *explain_unlink(const char *pathname); void explain_message_unlink(char *message, int message_size, const char *pathname); const char *explain_errno_unlink(int errnum, const char *pathname); void explain_message_errno_unlink(char *message, int message_size, int errnum, const char *pathname); DESCRIPTION
These functions may be used to obtain explanations for unlink(2) errors. explain_unlink const char *explain_unlink(const char *pathname); The explain_unlink function is used to obtain an explanation of an error returned by the unlink(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. This function is intended to be used in a fashion similar to the following example: if (unlink(pathname) < 0) { fprintf(stderr, '%s0, explain_unlink(pathname)); exit(EXIT_FAILURE); } pathname The original pathname, exactly as passed to the unlink(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. explain_errno_unlink const char *explain_errno_unlink(int errnum, const char * pathname); The explain_errno_unlink function is used to obtain an explanation of an error returned by the unlink(2) system call. The least the mes- sage 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 (unlink(pathname) < 0) { int err = errno; fprintf(stderr, '%s0, explain_errno_unlink(err, pathname)); 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. pathname The original pathname, exactly as passed to the unlink(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. explain_message_unlink void explain_message_unlink(char *message, int message_size, const char *pathname); The explain_message_unlink function is used to obtain an explanation of an error returned by the unlink(2) system call. The least the mes- sage 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 (unlink(pathname) < 0) { char message[3000]; explain_message_unlink(message, sizeof(message), pathname); fprintf(stderr, '%s0, message); exit(EXIT_FAILURE); } message The location in which to store the returned message. Because a message return buffer has been supplied, this function is thread safe. message_size The size in bytes of the location in which to store the returned message. pathname The original pathname, exactly as passed to the unlink(2) system call. explain_message_errno_unlink void explain_message_errno_unlink(char *message, int message_size, int errnum, const char *pathname); The explain_message_errno_unlink function is used to obtain an explanation of an error returned by the unlink(2) 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 (unlink(pathname) < 0) { int err = errno; char message[3000]; explain_message_errno_unlink(message, sizeof(message), err, pathname); fprintf(stderr, '%s0, message); exit(EXIT_FAILURE); } message The location in which to store the returned message. Because a message return buffer has been 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. pathname The original pathname, exactly as passed to the unlink(2) system call. COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller AUTHOR
Written by Peter Miller <pmiller@opensource.org.au> explain_unlink(3)