explain_mkstemp_or_die(3) [debian man page]
explain_mkstemp_or_die(3) Library Functions Manual explain_mkstemp_or_die(3) NAME
explain_mkstemp_or_die - create a unique temporary file and report errors SYNOPSIS
#include <libexplain/mkstemp.h> int explain_mkstemp_or_die(char *templat); int explain_mkstemp_on_error(char *templat); DESCRIPTION
The explain_mkstemp_or_die function is used to call the mkstemp(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_mkstemp(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_mkstemp_on_error function is used to call the mkstemp(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_mkstemp(3) function, but still returns to the caller. templat The template, exactly as to be passed to the mkstemp(3) system call. RETURN VALUE
The explain_mkstemp_or_die function only returns on success, see mkstemp(3) for more information. On failure, prints an explanation and exits, it does not return. The explain_mkstemp_on_error function always returns the value return by the wrapped mkstemp(3) system call. EXAMPLE
The explain_mkstemp_or_die function is intended to be used in a fashion similar to the following example: int result = explain_mkstemp_or_die(templat); SEE ALSO
mkstemp(3) create a unique temporary file explain_mkstemp(3) explain mkstemp(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_mkstemp_or_die(3)
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explain_mkostemp(3) Library Functions Manual explain_mkostemp(3) NAME
explain_mkostemp - explain mkostemp(3) errors SYNOPSIS
#include <libexplain/mkostemp.h> const char *explain_mkostemp(char *templat, int flags); const char *explain_errno_mkostemp(int errnum, char *templat, int flags); void explain_message_mkostemp(char *message, int message_size, char *templat, int flags); void explain_message_errno_mkostemp(char *message, int message_size, int errnum, char *templat, int flags); DESCRIPTION
These functions may be used to obtain explanations for errors returned by the mkostemp(3) system call. explain_mkostemp const char *explain_mkostemp(char *templat, int flags); The explain_mkostemp function is used to obtain an explanation of an error returned by the mkostemp(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 decoded. templat The original template, exactly as passed to the mkostemp(3) system call. flags The original flags, exactly as passed to the mkostemp(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 argument list. This will be overwritten 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 example: int result = mkostemp(templat, flags); if (result < 0) { fprintf(stderr, "%s ", explain_mkostemp(templat, flags)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_mkostemp_or_die(3) function. explain_errno_mkostemp const char *explain_errno_mkostemp(int errnum, char *templat, int flags); The explain_errno_mkostemp function is used to obtain an explanation of an error returned by the mkostemp(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. 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 explained and this function, because many libc functions will alter the value of errno. templat The original template, exactly as passed to the mkostemp(3) system call. flags The original flags, exactly as passed to the mkostemp(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 argument list. This will be overwritten 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 example: int result = mkostemp(templat, flags); if (result < 0) { int err = errno; fprintf(stderr, "%s ", explain_errno_mkostemp(err, templat, flags)); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_mkostemp_or_die(3) function. explain_message_mkostemp void explain_message_mkostemp(char *message, int message_size, char *templat, int flags); The explain_message_mkostemp function is used to obtain an explanation of an error returned by the mkostemp(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 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. templat The original template, exactly as passed to the mkostemp(3) system call. flags The original flags, exactly as passed to the mkostemp(3) system call. Example: This function is intended to be used in a fashion similar to the following example: int result = mkostemp(templat, flags); if (result < 0) { char message[3000]; explain_message_mkostemp(message, sizeof(message), templat, flags); fprintf(stderr, "%s ", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_mkostemp_or_die(3) function. explain_message_errno_mkostemp void explain_message_errno_mkostemp(char *message, int message_size, int errnum, char *templat, int flags); The explain_message_errno_mkostemp function is used to obtain an explanation of an error returned by the mkostemp(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 explained and this function, because many libc functions will alter the value of errno. templat The original template, exactly as passed to the mkostemp(3) system call. flags The original flags, exactly as passed to the mkostemp(3) system call. Example: This function is intended to be used in a fashion similar to the following example: int result = mkostemp(templat, flags); if (result < 0) { int err = errno; char message[3000]; explain_message_errno_mkostemp(message, sizeof(message), err, templat, flags); fprintf(stderr, "%s ", message); exit(EXIT_FAILURE); } The above code example is available pre-packaged as the explain_mkostemp_or_die(3) function. SEE ALSO
mkostemp(3) create a unique temporary file explain_mkostemp_or_die(3) create a unique temporary file and report errors COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_mkostemp(3)