SIMPLE SOLUTIONS

EXPLAIN_NANOSLEEP(3) - man page online | library functions

Explain nanosleep(2) errors.

Chapter
explain_nanosleep(3)                 Library Functions Manual                explain_nanosleep(3)

NAME explain_nanosleep - explain nanosleep(2) errors
SYNOPSIS #include <libexplain/nanosleep.h> const char *explain_nanosleep(const struct timespec *req, struct timespec *rem); const char *explain_errno_nanosleep(int errnum, const struct timespec *req, struct time‐ spec *rem); void explain_message_nanosleep(char *message, int message_size, const struct timespec *req, struct timespec *rem); void explain_message_errno_nanosleep(char *message, int message_size, int errnum, const struct timespec *req, struct timespec *rem);
DESCRIPTION These functions may be used to obtain explanations for errors returned by the nanosleep(2) system call. explain_nanosleep const char *explain_nanosleep(const struct timespec *req, struct timespec *rem); The explain_nanosleep function is used to obtain an explanation of an error returned by the nanosleep(2) system call. The least the message will contain is the value of str‐ error(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. req The original req, exactly as passed to the nanosleep(2) system call. rem The original rem, exactly as passed to the nanosleep(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 over‐ written 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 exam‐ ple: if (nanosleep(req, rem) < 0) { fprintf(stderr, "%s\n", explain_nanosleep(req, rem)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_nanosleep_or_die(3) func‐ tion. explain_errno_nanosleep const char *explain_errno_nanosleep(int errnum, const struct timespec *req, struct time‐ spec *rem); The explain_errno_nanosleep function is used to obtain an explanation of an error returned by the nanosleep(2) system call. The least the message will contain is the value of str‐ error(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. req The original req, exactly as passed to the nanosleep(2) system call. rem The original rem, exactly as passed to the nanosleep(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 over‐ written 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 exam‐ ple: if (nanosleep(req, rem) < 0) { int err = errno; fprintf(stderr, "%s\n", explain_errno_nanosleep(err, req, rem)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_nanosleep_or_die(3) func‐ tion. explain_message_nanosleep void explain_message_nanosleep(char *message, int message_size, const struct timespec *req, struct timespec *rem); The explain_message_nanosleep function is used to obtain an explanation of an error returned by the nanosleep(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. req The original req, exactly as passed to the nanosleep(2) system call. rem The original rem, exactly as passed to the nanosleep(2) system call. Example: This function is intended to be used in a fashion similar to the following exam‐ ple: if (nanosleep(req, rem) < 0) { char message[3000]; explain_message_nanosleep(message, sizeof(message), req, rem); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_nanosleep_or_die(3) func‐ tion. explain_message_errno_nanosleep void explain_message_errno_nanosleep(char *message, int message_size, int errnum, const struct timespec *req, struct timespec *rem); The explain_message_errno_nanosleep function is used to obtain an explanation of an error returned by the nanosleep(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. req The original req, exactly as passed to the nanosleep(2) system call. rem The original rem, exactly as passed to the nanosleep(2) system call. Example: This function is intended to be used in a fashion similar to the following exam‐ ple: if (nanosleep(req, rem) < 0) { int err = errno; char message[3000]; explain_message_errno_nanosleep(message, sizeof(message), err, req, rem); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_nanosleep_or_die(3) func‐ tion.
SEE ALSO nanosleep(2) high‐resolution sleep explain_nanosleep_or_die(3) high‐resolution sleep and report errors
explain_nanosleep(3)
This manual Reference Other manuals
explain_nanosleep(3) referred by explain(3) | explain_nanosleep_or_die(3)
refer to explain_nanosleep_or_die(3) | nanosleep(2)