libexplain
1.4.D001
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Functions | |
void | explain_message_dup2 (char *message, int message_size, int oldfd, int newfd) |
void explain_message_dup2 | ( | char * | message, |
int | message_size, | ||
int | oldfd, | ||
int | newfd | ||
) |
The explain_message_dup2 function is used to obtain an explanation of an error returned by the dup2(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.
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 (dup2(oldfd, newfd) < 0) { char message[3000]; explain_message_dup2(message, sizeof(message), oldfd, newfd); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); }
The above code example is available pre-packaged as the explain_dup2_or_die function.
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. |
oldfd | The original oldfd, exactly as passed to the dup2(2) system call. |
newfd | The original newfd, exactly as passed to the dup2(2) system call. |