explain_symlink(3) Library Functions Manual explain_symlink(3)
NAME
explain_symlink - explain symlink(2) errors
SYNOPSIS
#include <libexplain/symlink.h>
const char *explain_symlink(const char *oldpath, const char *newpath);
const char *explain_errno_symlink(int errnum, const char *oldpath, const char *newpath);
void explain_message_symlink(char *message, int message_size, const char *oldpath, const char *newpath);
void explain_message_errno_symlink(char *message, int message_size, int errnum, const char *oldpath, const char *newpath);
DESCRIPTION
These functions may be used to obtain explanations for symlink(2) errors.
explain_symlink
const char *explain_symlink(const char *oldpath, const char *newpath);
The explain_symlink function is used to obtain an explanation of an error returned by the symlink(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 (symlink(oldpath, rewpath) < 0)
{
fprintf(stderr, '%s0, explain_symlink(oldpath, newpath));
exit(EXIT_FAILURE);
}
oldpath The original oldpath, exactly as passed to the symlink(2) system call.
newpath The original newpath, exactly as passed to the symlink(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_symlink
const char *explain_errno_symlink(int errnum, const char *oldpath, const char * newpath);
The explain_errno_symlink function is used to obtain an explanation of an error returned by the symlink(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 (symlink(oldpath, newpath) < 0)
{
int err = errno;
fprintf(stderr, '%s0, explain_errno_symlink(err, oldpath,
newpath));
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.
oldpath The original oldpath, exactly as passed to the symlink(2) system call.
newpath The original newpath, exactly as passed to the symlink(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_symlink
void explain_message_symlink(char *message, int message_size, const char *oldpath, const char *newpath);
The explain_message_symlink function is used to obtain an explanation of an error returned by the symlink(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]fP 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 (symlink(oldpath, newpath) < 0)
{
char message[3000];
explain_message_symlink(message, sizeof(message), oldpath,
newpath);
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.
oldpath The original oldpath, exactly as passed to the symlink(2) system call.
newpath The original newpath, exactly as passed to the symlink(2) system call.
explain_message_errno_symlink
void explain_message_errno_symlink(char *message, int message_size, int errnum, const char *oldpath, const char *newpath);
The explain_message_errno_symlink function is used to obtain an explanation of an error returned by the symlink(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 (symlink(oldpath, newpath) < 0)
{
int err = errno;
char message[3000];
explain_message_errno_symlink(message, sizeof(message), err,
oldpath, newpath);
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.
oldpath The original oldpath, exactly as passed to the symlink(2) system call.
newpath The original newpath, exactly as passed to the symlink(2) system call.
COPYRIGHT
libexplain version 0.52
Copyright (C) 2008 Peter Miller
AUTHOR
Written by Peter Miller <pmiller@opensource.org.au>
explain_symlink(3)