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* stream.c (run): replace_env takes only one argument.
* tests/018/process.tl: *child-env* tests are reporting some extra
environment variables on Windows; let's just disable them.
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This specifies the environment to be used for executing
programs.
* stream.c (open_subprocess, run): Check *child-env* variable and if
other than t, then install the environment before execvp.
In the spawn-based version of run, we save and restore the
environment around the spawn call, if *child-env* is in
effect.
* sysif.c (child_env_s): New symbol variable.
(exec_wrap): If *child-env* is other than t, then save the
environment in a list, and install the specified environment
before calling execvp. If that function returns, restore the
environbment.
* sysif.h (child_env_s): Declared.
(child_env): New macro.
* tests/018/process.tl: New tests.
* txr.1: Documented.
* stdlib/doc-syms.tl: Updated.
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* tests/002/query-1.txr: Skip test if an executable
/bin/sh doesn't exist, rather than the bogus reasons.
* tests/010/json.tl: Change the condition for the
command-put-json tests: not whether cat is found
in the search path but whether /bin/sh exists and is executable.
* tests/017/realpath.tl: Also quit if /usr/bin doesn't exist.
* tests/018/path-test.tl: Exit succesfully if /bin/sh
does not exist. Revert the earlier change.
* tests/018/process.tl: Quit if no executable /bin/sh exists.
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* stream.c (fds_subst, fds_swizzle, fds_restore): These functions are
used on Cygwin by some functions that are based on spawn, and so must be
avaiable.
* tests/018/process.tl: Two fixes here. Firstly, the 1>&1 redirection in
one of the tests should be 1>&2 on all platforms. That a temporary edit
left behind from massaging the tests and the code. Secondly, some weird
results are observed on Cygwin. The communication with the child sees
an extra carriage return and space sneak in. I'm just codifying this as
Cygwin's way of passing the test case; it's likely unfixable at the
application level.
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* tests/018/process.tl: New file.
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