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Top Forums Programming what is the main difference between difference between using nonatomic lseek and O_APPEND Post 302715083 by jim mcnamara on Saturday 13th of October 2012 06:36:52 PM
Old 10-13-2012
O_APPEND guarantees that every write to the file will be at the end of the file. lseek guarantees that the file pointer is positioned to the current EOF of the file. It does not guarantee that subsequent writes will be at the end of the file.

The above is something that you only worry about when multiple processes or threads are writing to one file.

Neither guarantees any kind of sequence of I/O writes when there are multiple writers. If you need that, then you have to resort to something like SYSV semaphores for multi-process apps or mutxes in the case of multi-threaded apps.
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fdimd64(3M)															       fdimd64(3M)

NAME
fdimd64(), fdimd128(), fdimd32() - decimal positive difference functions SYNOPSIS
DESCRIPTION
The function determines the positive difference of its arguments: If x y, returns x y. If x y, returns +0. is a version of it takes arguments and returns a result. is a version of it takes arguments and returns a result. These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward. USAGE
To use any of these functions, compile with the option. Make sure your program defines and then includes Link in the math library by specifying or on the linking command line. For more information, see the at the following site: RETURN VALUE
raises any overflow or inexact exceptions resulting from the subtraction. If either argument is NaN, returns NaN. ERRORS
If the subtraction overflows, sets to SEE ALSO
fmaxd64(3M), fmind64(3M), math(5). STANDARDS CONFORMANCE
These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic". HP Integrity Server Only fdimd64(3M)
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