Prevent mutating the global environment pointer in `CommandExt::exec` and opt to use execve and resolve path manually#157144

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asder8215 wants to merge 6 commits into

rust-lang:mainfrom

asder8215:commandext_exec_bug_fix

Commits on Jul 7, 2026

Prevent mutating the global environment pointer in CommandExt::exec and opt to use execve and resolve path manually
asder8215
committed
Perform all memory allocations necessary for do_exec before forking; confstr_as_cstring added to get a CString value returned by confstr, added CStringArray::from_ptr, added default_path and shell_…
asder8215
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Pre-allocate a buffer with the maximum path length that we'll have from a single passthrough in envp, match on errno values directly instead of ErrorKind, fix shell_argv CStringArray value.
asder8215
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Search for PATH environment variable from maybe_envp/environ() once, remove confstr_as_cstr, remove unnecessary shell_argv field/funtions + unused functions from CStringArray, use slice::split to d…
asder8215
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Account for paths with separator byte at the end and added further documentation for returning an error from execve
asder8215
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Update documentation on confstr to refer to Issue 8 instead of Issue 7 of confstr
asder8215
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