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libfortran/90038: Document new wait=.false. implementation

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2019-05-21  Janne Blomqvist  <jb@gcc.gnu.org>

	PR libfortran/90038
	* intrinsic.texi (EXECUTE_COMMAND_LINE): Explain new
	wait=.false. implementation.

From-SVN: r271468
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Janne Blomqvist 2019-05-21 18:17:44 +03:00
parent 692af872fa
commit 1a815b1822
2 changed files with 16 additions and 6 deletions
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6
gcc/fortran/ChangeLog
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@ -1,3 +1,9 @@
2019-05-21 Janne Blomqvist <jb@gcc.gnu.org>
PR libfortran/90038
* intrinsic.texi (EXECUTE_COMMAND_LINE): Explain new
wait=.false. implementation.
2019-05-20 Mark Eggleston <markeggleston@codethink.com>
* gfortran.texi: Remove reference to the ASSIGN statement, capitalise

16
gcc/fortran/intrinsic.texi
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@ -5596,12 +5596,12 @@ end program atomic
@code{EXECUTE_COMMAND_LINE} runs a shell command, synchronously or
asynchronously.
The @code{COMMAND} argument is passed to the shell and executed, using
the C library's @code{system} call. (The shell is @code{sh} on Unix
systems, and @code{cmd.exe} on Windows.) If @code{WAIT} is present
and has the value false, the execution of the command is asynchronous
if the system supports it; otherwise, the command is executed
synchronously.
The @code{COMMAND} argument is passed to the shell and executed (The
shell is @code{sh} on Unix systems, and @code{cmd.exe} on Windows.).
If @code{WAIT} is present and has the value false, the execution of
the command is asynchronous if the system supports it; otherwise, the
command is executed synchronously using the C library's @code{system}
call.
The three last arguments allow the user to get status information. After
synchronous execution, @code{EXITSTAT} contains the integer exit code of
@ -5613,6 +5613,10 @@ Note that the @code{system} function need not be thread-safe. It is
the responsibility of the user to ensure that @code{system} is not
called concurrently.
For asynchronous execution on supported targets, the POSIX
@code{posix_spawn} or @code{fork} functions are used. Also, a signal
handler for the @code{SIGCHLD} signal is installed.
@item @emph{Standard}:
Fortran 2008 and later