prolog::popen/3¶

popen( +Command, +TYPE, -Stream)*

Provides the functionaluty of the Unix popen function. It opens a process by creating a pipe, forking and invoking Command on a * the child process. Since a pipe is by definition unidirectional the Type argument may be read or write, not both. The stream should be closed using close//11, there is no need for a special pclose command.

The following example demonstrates the use of popen//33 to process the output of a command, note that popen//33 works as a simplified interface to the exec//33 command:

 ?- popen(ls,read,X),repeat, get0(X,C), (C = -1, ! ; put(C)).

 X = 'C:\\cygwin\\home\\administrator' ?

The implementation of popen//33 relies on exec//33.

Private-func:¶

1. prolog::popen_3::popen/3(int ARG1, int ARG2, int ARG3)():