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NAMEexplain_readv - explain readv(2) errorsSYNOPSIS#include <libexplain/readv.h>const char *explain_readv(int fildes, const struct iovec *iov, int
iovcnt);
DESCRIPTIONThese functions may be used to obtain explanations for errors returned by the readv(2) system call.explain_readvconst char *explain_readv(int fildes, const struct iovec *iov, int iovcnt);The explain_readv function is used to obtain an explanation of an error returned by the readv(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.
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: ssize_t result = readv(fildes, iov, iovcnt); if (result < 0) { fprintf(stderr, "%s\n", explain_readv(fildes, iov, iovcnt)); exit(EXIT_FAILURE); } The above code example is available pre‐packaged as the explain_readv_or_die(3) function. explain_errno_readvconst char *explain_errno_readv(int errnum, int fildes, const struct iovec *iov, int iovcnt);The explain_errno_readv function is used to obtain an explanation of an error returned by the readv(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.
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: ssize_t result = readv(fildes, iov, iovcnt); if (result < 0) { int err = errno; fprintf(stderr, "%s\n", explain_errno_readv(err, fildes, iov, iovcnt)); exit(EXIT_FAILURE); } The above code example is available pre‐packaged as the explain_readv_or_die(3) function. explain_message_readvvoid explain_message_readv(char *message, int message_size, int fildes, const struct iovec *iov, int iovcnt);The explain_message_readv function is used to obtain an explanation of an error returned by the readv(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.
Example: This function is intended to be used in a fashion similar to the following example: ssize_t result = readv(fildes, iov, iovcnt); if (result < 0) { char message[3000];explain_message_readv(message, sizeof(message), fildes, iov, iovcnt);
The above code example is available pre‐packaged as the explain_readv_or_die(3) function. explain_message_errno_readvvoid explain_message_errno_readv(char *message, int message_size, int errnum, int fildes, const struct iovec *iov, int iovcnt);The explain_message_errno_readv function is used to obtain an explanation of an error returned by the readv(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.
Example: This function is intended to be used in a fashion similar to the following example: ssize_t result = readv(fildes, iov, iovcnt); if (result < 0) { int err = errno; char message[3000];explain_message_errno_readv(message, sizeof(message), err, fildes, iov, iovcnt);
The above code example is available pre‐packaged as the explain_readv_or_die(3) function. SEE ALSO
COPYRIGHTlibexplain version 1.3Copyright (C) 2009 Peter Miller Visit the GSP FreeBSD Man Page Interface. |