explain_lutimes(3) Library Functions Manual explain_lutimes(3) NAME explain_lutimes - explain lutimes(3) errors SYNOPSIS #include <libexplain/lutimes.h> const char *explain_lutimes(const char *pathname, const struct timeval *data); const char *explain_errno_lutimes(int errnum, const char *pathname, const struct timeval *data); void explain_message_lutimes(char *message, int message_size, const char *pathname, const struct timeval *data); void explain_message_errno_lutimes(char *message, int message_size, int er- rnum, const char *pathname, const struct timeval *data); DESCRIPTION These functions may be used to obtain explanations for errors returned by the lutimes(3) system call. explain_lutimes const char *explain_lutimes(const char *pathname, const struct timeval *data); The explain_lutimes function is used to obtain an explanation of an error returned by the lutimes(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. pathname The original pathname, exactly as passed to the lutimes(3) system call. data The original data, exactly as passed to the lutimes(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 (lutimes(pathname, data) < 0) { fprintf(stderr, "%s\n", explain_lutimes(pathname, data)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_lu- times_or_die(3) function. explain_errno_lutimes const char *explain_errno_lutimes(int errnum, const char *pathname, const struct timeval *data); The explain_errno_lutimes function is used to obtain an explanation of an error returned by the lutimes(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. pathname The original pathname, exactly as passed to the lutimes(3) system call. data The original data, exactly as passed to the lutimes(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 (lutimes(pathname, data) < 0) { int err = errno; fprintf(stderr, "%s\n", explain_errno_lutimes(err, pathname, data)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_lu- times_or_die(3) function. explain_message_lutimes void explain_message_lutimes(char *message, int message_size, const char *pathname, const struct timeval *data); The explain_message_lutimes function is used to obtain an explanation of an error returned by the lutimes(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. 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. pathname The original pathname, exactly as passed to the lutimes(3) system call. data The original data, exactly as passed to the lutimes(3) system call. Example: This function is intended to be used in a fashion similar to the following example: if (lutimes(pathname, data) < 0) { char message[3000]; explain_message_lutimes(message, sizeof(message), pathname, data); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_lu- times_or_die(3) function. explain_message_errno_lutimes void explain_message_errno_lutimes(char *message, int message_size, int er- rnum, const char *pathname, const struct timeval *data); The explain_message_errno_lutimes function is used to obtain an explanation of an error returned by the lutimes(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. pathname The original pathname, exactly as passed to the lutimes(3) system call. data The original data, exactly as passed to the lutimes(3) system call. Example: This function is intended to be used in a fashion similar to the following example: if (lutimes(pathname, data) < 0) { int err = errno; char message[3000]; explain_message_errno_lutimes(message, sizeof(message), err, pathname, data); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_lu- times_or_die(3) function. SEE ALSO lutimes(3) modify file timestamps explain_lutimes_or_die(3) modify file timestamps and report errors COPYRIGHT libexplain version 1.3 Copyright (C) 2013 Peter Miller explain_lutimes(3)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COPYRIGHT
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