explain_acl_get_file man page

explain_acl_get_file — explain acl_get_file(3) errors

Synopsis

#include <libexplain/acl_get_file.h>

const char *explain_acl_get_file(const char *pathname, acl_type_t type);
const char *explain_errno_acl_get_file(int errnum, const char *pathname, acl_type_t type);
void explain_message_acl_get_file(char *message, int message_size, const char *pathname, acl_type_t type);
void explain_message_errno_acl_get_file(char *message, int message_size, int errnum, const char *pathname, acl_type_t type);

Description

These functions may be used to obtain explanations for errors returned by the acl_get_file(3) system call.

explain_acl_get_file

const char *explain_acl_get_file(const char *pathname, acl_type_t type);

The explain_acl_get_file function is used to obtain an explanation of an error returned by the acl_get_file(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.

pathname
The original pathname, exactly as passed to the acl_get_file(3) system call.
type
The original type, exactly as passed to the acl_get_file(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.

Example: This function is intended to be used in a fashion similar to the following example:

acl_t result = acl_get_file(pathname, type);
if (result < 0)

{

fprintf(stderr, "%s\n", explain_acl_get_file(pathname, type));

    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_acl_get_file_or_die(3) function.

explain_errno_acl_get_file

const char *explain_errno_acl_get_file(int errnum, const char *pathname, acl_type_t type);

The explain_errno_acl_get_file function is used to obtain an explanation of an error returned by the acl_get_file(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.

errnum
The error value to be decoded, usually obtained from the errno global variable just before this function is called. This is necessary 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 acl_get_file(3) system call.
type
The original type, exactly as passed to the acl_get_file(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.

Example: This function is intended to be used in a fashion similar to the following example:

acl_t result = acl_get_file(pathname, type);
if (result < 0)

{
    int err = errno;

fprintf(stderr, "%s\n", explain_errno_acl_get_file(err, pathname, type));

    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_acl_get_file_or_die(3) function.

explain_message_acl_get_file

void explain_message_acl_get_file(char *message, int message_size, const char *pathname, acl_type_t type);

The explain_message_acl_get_file function is used to obtain an explanation of an error returned by the acl_get_file(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.

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.
pathname
The original pathname, exactly as passed to the acl_get_file(3) system call.
type
The original type, exactly as passed to the acl_get_file(3) system call.

Example: This function is intended to be used in a fashion similar to the following example:

acl_t result = acl_get_file(pathname, type);
if (result < 0)

{
    char message[3000];

explain_message_acl_get_file(message, sizeof(message), pathname, type);

    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_acl_get_file_or_die(3) function.

explain_message_errno_acl_get_file

void explain_message_errno_acl_get_file(char *message, int message_size, int errnum, const char *pathname, acl_type_t type);

The explain_message_errno_acl_get_file function is used to obtain an explanation of an error returned by the acl_get_file(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.

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 necessary 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 acl_get_file(3) system call.
type
The original type, exactly as passed to the acl_get_file(3) system call.

Example: This function is intended to be used in a fashion similar to the following example:

acl_t result = acl_get_file(pathname, type);
if (result < 0)

{
    int err = errno;
    char message[3000];

explain_message_errno_acl_get_file(message, sizeof(message), err, pathname, type);

    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_acl_get_file_or_die(3) function.

See Also

acl_get_file(3)
Execute acl_get_file(3)
explain_acl_get_file_or_die(3)
Execute acl_get_file(3) and report errors

Referenced By

explain(3), explain_acl_get_file_or_die(3).