Subprocesses, portable.
sh runs a command to completion; spawn keeps a long-lived child with piped
stdin/stdout, which is what an MCP stdio transport needs and what sh cannot
express.
Subprocesses, portable. `sh` runs a command to completion; `spawn` keeps a long-lived child with piped stdin/stdout, which is what an MCP stdio transport needs and what `sh` cannot express.
(alive? child)True while the child is running.
True while the child is running.
(close! child)Close the child's stdin, wait for it to exit, and return the exit code.
Close the child's stdin, wait for it to exit, and return the exit code.
(read-line! child)Block for one line from the child's stdout, WITHOUT the terminator. nil at EOF.
Block for one line from the child's stdout, WITHOUT the terminator. nil at EOF.
(send-line! child s)Write s + newline to the child's stdin and flush. Returns nil.
Write `s` + newline to the child's stdin and flush. Returns nil.
(sh command)(sh command {:keys [in dir env] :as opts})Run command (a vector) to completion. Returns {:out :err :exit}.
Never throws on a non-zero exit — that is a normal result.
opts: :in (string on stdin) :dir :env
Run `command` (a vector) to completion. Returns {:out :err :exit}.
Never throws on a non-zero exit — that is a normal result.
opts: :in (string on stdin) :dir :env(spawn command)(spawn command {:keys [dir env]})Start command (a vector) as a LONG-LIVED child with piped stdin/stdout and
return a child handle — a map of closures, see above. This is what a
line-delimited JSON-RPC transport (MCP stdio) requires; sh cannot express it.
The child's STDERR is drained from the moment it starts — see the comment
above; not draining it deadlocks the child once the pipe buffer fills. Read it
with stderr-lines.
opts: :dir :env
Start `command` (a vector) as a LONG-LIVED child with piped stdin/stdout and return a child handle — a map of closures, see above. This is what a line-delimited JSON-RPC transport (MCP stdio) requires; `sh` cannot express it. The child's STDERR is drained from the moment it starts — see the comment above; not draining it deadlocks the child once the pipe buffer fills. Read it with `stderr-lines`. opts: :dir :env
(stderr-lines child)The child's most recent stderr lines (up to 200), oldest first, as a vector.
Always available — stderr is drained from the moment the child starts, so this is a snapshot of a buffer that is being filled for you, not a read that could block. Returns [] when the child has written nothing.
The child's most recent stderr lines (up to 200), oldest first, as a vector. Always available — stderr is drained from the moment the child starts, so this is a snapshot of a buffer that is being filled for you, not a read that could block. Returns [] when the child has written nothing.
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