5.139. ksh

BZ#577223

Previously, ksh sometimes did not restore terminal settings after read timeout when operating in a multibyte environment. This could cause the terminal to no longer echo input characters. This updates applies a patch ensuring that the terminal is restored properly after the timeout and the user's input is now echoed as expected.

BZ#742930

When exiting a subshell after a command substitution, ksh could prematurely exit without any error message. With this update, ksh no longer terminates under these circumstances and all subsequent commands are processed correctly.

BZ#743840

Previously, ksh did not prevent modifications of variables of the read-only type. As a consequence, ksh terminated unexpectedly with a segmentation fault when such a variable was modified. With this update, modification of read-only variables are not allowed, and ksh prints an error message in this scenario.

BZ#781498

Previously, ksh did not close certain file descriptors prior to execution. This could lead to a file descriptor leak, and certain applications could consequently report error messages. With this update, file descriptors are marked to be closed on execution if appropriate, so file descriptor leaks no longer occur.

BZ#781976

In certain cases, ksh unnecessarily called the vfork() function. An extra process was created, and it could be difficult to determine how many instances of a script were running. A patch has been applied to address this problem, and extra processes are no longer created if not required.

BZ#786787

Previously, ksh could incorrectly seek in the input stream. This could lead to data corruption in the here-document section of a script. This update corrects the seek behavior, so the data no longer gets corrupted in this scenario.

BZ#798868

Previously, ksh did not allocate the correct amount of memory for its data structures containing information about file descriptors. When running a task that used file descriptors extensively, ksh terminated unexpectedly with a segmentation fault. With this update, the proper amount of memory is allocated, and ksh no longer crashes if file descriptors are used extensively.

BZ#800684

Previously, ksh did not expand the tilde (~) character properly. For example, characters in the tilde prefix were not treated as a login name but as a part of the path and the "No such file or directory" message was displayed. The underlying source code has been modified and tilde expansion now works as expected in such a scenario.

Bug Fix

BZ#927584

Previously, the output a of command substitutions was not always redirected properly. Consequently, the output in a here-document could be lost. This update fixes the redirection code for command substitutions, and now the here-document contains the output of command substitutions as expected.