explain_futimens(3) Library Functions Manual explain_futimens(3) NAME explain_futimens - explain futimens(3) errors SYNOPSIS #include <libexplain/futimens.h> const char *explain_futimens(int fildes, const struct time_spec *data); const char *explain_errno_futimens(int errnum, int fildes, const struct time_spec *data); void explain_message_futimens(char *message, int message_size, int fildes, const struct time_spec *data); void explain_message_errno_futimens(char *message, int message_size, int errnum, int fildes, const struct time_spec *data); DESCRIPTION These functions may be used to obtain explanations for errors returned by the futimens(3) system call. explain_futimens const char *explain_futimens(int fildes, const struct time_spec *data); The explain_futimens function is used to obtain an explanation of an error returned by the futimens(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 de- coded. fildes The original fildes, exactly as passed to the futimens(3) system call. data The original data, exactly as passed to the futimens(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 ar- gument list. This will be overwritten by the next call to any lib- explain 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 (futimens(fildes, data) < 0) { fprintf(stderr, "%s\n", explain_futimens(fildes, data)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_futi- mens_or_die(3) function. explain_errno_futimens const char *explain_errno_futimens(int errnum, int fildes, const struct time_spec *data); The explain_errno_futimens function is used to obtain an explanation of an error returned by the futimens(3) system call. The least the message will contain is the value of strerror(errno), but usually it will do much bet- ter, 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 neces- sary if you need to call any code between the system call to be ex- plained and this function, because many libc functions will alter the value of errno. fildes The original fildes, exactly as passed to the futimens(3) system call. data The original data, exactly as passed to the futimens(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 ar- gument list. This will be overwritten by the next call to any lib- explain 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 (futimens(fildes, data) < 0) { int err = errno; fprintf(stderr, "%s\n", explain_errno_futimens(err, fildes, data)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_futi- mens_or_die(3) function. explain_message_futimens void explain_message_futimens(char *message, int message_size, int fildes, const struct time_spec *data); The explain_message_futimens function is used to obtain an explanation of an error returned by the futimens(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 de- coded. 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. fildes The original fildes, exactly as passed to the futimens(3) system call. data The original data, exactly as passed to the futimens(3) system call. Example: This function is intended to be used in a fashion similar to the following example: if (futimens(fildes, data) < 0) { char message[3000]; explain_message_futimens(message, sizeof(message), fildes, data); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_futi- mens_or_die(3) function. explain_message_errno_futimens void explain_message_errno_futimens(char *message, int message_size, int errnum, int fildes, const struct time_spec *data); The explain_message_errno_futimens function is used to obtain an explana- tion of an error returned by the futimens(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 neces- sary if you need to call any code between the system call to be ex- plained and this function, because many libc functions will alter the value of errno. fildes The original fildes, exactly as passed to the futimens(3) system call. data The original data, exactly as passed to the futimens(3) system call. Example: This function is intended to be used in a fashion similar to the following example: if (futimens(fildes, data) < 0) { int err = errno; char message[3000]; explain_message_errno_futimens(message, sizeof(message), err, fildes, data); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_futi- mens_or_die(3) function. SEE ALSO futimens(3) change file timestamps with nanosecond precision explain_futimens_or_die(3) change file timestamps with nanosecond precision and report errors COPYRIGHT libexplain version 1.3 Copyright (C) 2013 Peter Miller explain_futimens(3)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COPYRIGHT
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