Last Change: 2018-09-07, 16:50
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explain_uname − explain uname(2) errors
#include <libexplain/uname.h>
const char *explain_uname(struct utsname *data);
const char *explain_errno_uname(int errnum, struct utsname *data);
void explain_message_uname(char *message, int message_size, struct utsname *data);
void explain_message_errno_uname(char *message, int message_size, int errnum, struct utsname *data);
These functions may be used to obtain explanations for errors returned by the uname(2) system call.
explain_uname
const char *explain_uname(struct utsname *data);
The explain_uname function is used to obtain an explanation of an error returned by the uname(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.
|
data |
The original data, exactly as passed to the uname(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 (uname(data) < 0)
{
fprintf(stderr, "%s\n", explain_uname(data));
exit(EXIT_FAILURE);
}
The above code example is available pre−packaged as the explain_uname_or_die(3) function.
explain_errno_uname
const char *explain_errno_uname(int errnum, struct utsname *data);
The explain_errno_uname function is used to obtain an explanation of an error returned by the uname(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 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. |
||
|
data |
The original data, exactly as passed to the uname(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 (uname(data) < 0)
{
int err = errno;
fprintf(stderr, "%s\n", explain_errno_uname(err, data));
exit(EXIT_FAILURE);
}
The above code example is available pre−packaged as the explain_uname_or_die(3) function.
explain_message_uname
void explain_message_uname(char *message, int message_size, struct utsname *data);
The explain_message_uname function is used to obtain an explanation of an error returned by the uname(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.
|
data |
The original data, exactly as passed to the uname(2) system call. |
Example: This function is intended to be used in a fashion similar to the following example:
if (uname(data) < 0)
{
char message[3000];
explain_message_uname(message, sizeof(message), data);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre−packaged as the explain_uname_or_die(3) function.
explain_message_errno_uname
void explain_message_errno_uname(char *message, int message_size, int errnum, struct utsname *data);
The explain_message_errno_uname function is used to obtain an explanation of an error returned by the uname(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 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. |
||
|
data |
The original data, exactly as passed to the uname(2) system call. |
Example: This function is intended to be used in a fashion similar to the following example:
if (uname(data) < 0)
{
int err = errno;
char message[3000];
explain_message_errno_uname(message, sizeof(message), err, data);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre−packaged as the explain_uname_or_die(3) function.
get name and information about current kernel
get name and information about current kernel and report errors
libexplain version 1.4
Copyright (C) 2013 Peter Miller