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/* list of name, value, name, value, ... elements. By default only the
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/* command search path is initialized to _PATH_DEFPATH.
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/* .IP "VSTREAM_POPEN_EXPORT (char **)"
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/* Null-terminated array of names of environment parameters
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/* that can be exported. By default, everything is exported.
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/* The user ID to execute the command as. The user ID must be non-zero.
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/* The group ID to execute the command as. The group ID must be non-zero.
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/* .IP "VSTREAM_POPEN_SHELL (char *)"
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/* The shell to use when executing the command specified with