Messages in this thread Patch in this message | | | Date | Wed, 31 Jan 2024 16:14:58 -0800 | Subject | [PATCH v2 4/9] tools subcmd: Add a no exec function call option | From | Ian Rogers <> |
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Tools like perf fork tests in case they crash, but they don't want to exec a full binary. Add an option to call a function rather than do an exec. The child process exits with the result of the function call and is passed the struct of the run_command, things like container_of can then allow the child process function to determine additional arguments.
Signed-off-by: Ian Rogers <irogers@google.com> --- tools/lib/subcmd/run-command.c | 2 ++ tools/lib/subcmd/run-command.h | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/tools/lib/subcmd/run-command.c b/tools/lib/subcmd/run-command.c index 5cdac2162532..d435eb42354b 100644 --- a/tools/lib/subcmd/run-command.c +++ b/tools/lib/subcmd/run-command.c @@ -122,6 +122,8 @@ int start_command(struct child_process *cmd) } if (cmd->preexec_cb) cmd->preexec_cb(); + if (cmd->no_exec_cmd) + exit(cmd->no_exec_cmd(cmd)); if (cmd->exec_cmd) { execv_cmd(cmd->argv); } else { diff --git a/tools/lib/subcmd/run-command.h b/tools/lib/subcmd/run-command.h index 17d969c6add3..d794138a797f 100644 --- a/tools/lib/subcmd/run-command.h +++ b/tools/lib/subcmd/run-command.h @@ -47,6 +47,8 @@ struct child_process { unsigned exec_cmd:1; /* if this is to be external sub-command */ unsigned stdout_to_stderr:1; void (*preexec_cb)(void); + /* If set, call function in child rather than doing an exec. */ + int (*no_exec_cmd)(struct child_process *process); }; int start_command(struct child_process *); -- 2.43.0.429.g432eaa2c6b-goog
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