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tools subcmd: Add a no exec function call option

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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>
Cc: James Clark <james.clark@arm.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: llvm@lists.linux.dev
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240221034155.1500118-5-irogers@google.com
This commit is contained in:
Ian Rogers 2024-02-20 19:41:51 -08:00 committed by Namhyung Kim
parent 526f2ac9f6
commit 1a562c0d44
2 changed files with 4 additions and 0 deletions
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2
tools/lib/subcmd/run-command.c
View File

@ -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 {

2
tools/lib/subcmd/run-command.h
View File

@ -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 *);