diff options
Diffstat (limited to 'run-command.h')
| -rw-r--r-- | run-command.h | 130 |
1 files changed, 125 insertions, 5 deletions
diff --git a/run-command.h b/run-command.h index 3653bfa6e1..50666497ae 100644 --- a/run-command.h +++ b/run-command.h @@ -5,8 +5,12 @@ #include <pthread.h> #endif +#include "argv-array.h" + struct child_process { const char **argv; + struct argv_array args; + struct argv_array env_array; pid_t pid; /* * Using .in, .out, .err: @@ -41,19 +45,25 @@ struct child_process { unsigned clean_on_exit:1; }; +#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT } +void child_process_init(struct child_process *); +void child_process_clear(struct child_process *); + int start_command(struct child_process *); int finish_command(struct child_process *); +int finish_command_in_signal(struct child_process *); int run_command(struct child_process *); -extern char *find_hook(const char *name); +/* + * Returns the path to the hook file, or NULL if the hook is missing + * or disabled. Note that this points to static storage that will be + * overwritten by further calls to find_hook and run_hook_*. + */ +extern const char *find_hook(const char *name); LAST_ARG_MUST_BE_NULL extern int run_hook_le(const char *const *env, const char *name, ...); extern int run_hook_ve(const char *const *env, const char *name, va_list args); -LAST_ARG_MUST_BE_NULL -__attribute__((deprecated)) -extern int run_hook_with_custom_index(const char *index_file, const char *name, ...); - #define RUN_COMMAND_NO_STDIN 1 #define RUN_GIT_CMD 2 /*If this is to be git sub-command */ #define RUN_COMMAND_STDOUT_TO_STDERR 4 @@ -68,6 +78,36 @@ int run_command_v_opt(const char **argv, int opt); */ int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); +/** + * Execute the given command, sending "in" to its stdin, and capturing its + * stdout and stderr in the "out" and "err" strbufs. Any of the three may + * be NULL to skip processing. + * + * Returns -1 if starting the command fails or reading fails, and otherwise + * returns the exit code of the command. Any output collected in the + * buffers is kept even if the command returns a non-zero exit. The hint fields + * gives starting sizes for the strbuf allocations. + * + * The fields of "cmd" should be set up as they would for a normal run_command + * invocation. But note that there is no need to set the in, out, or err + * fields; pipe_command handles that automatically. + */ +int pipe_command(struct child_process *cmd, + const char *in, size_t in_len, + struct strbuf *out, size_t out_hint, + struct strbuf *err, size_t err_hint); + +/** + * Convenience wrapper around pipe_command for the common case + * of capturing only stdout. + */ +static inline int capture_command(struct child_process *cmd, + struct strbuf *out, + size_t hint) +{ + return pipe_command(cmd, NULL, 0, out, hint, NULL, 0); +} + /* * The purpose of the following functions is to feed a pipe by running * a function asynchronously and providing output that the caller reads. @@ -93,9 +133,89 @@ struct async { int proc_in; int proc_out; #endif + int isolate_sigpipe; }; int start_async(struct async *async); int finish_async(struct async *async); +int in_async(void); +void NORETURN async_exit(int code); + +/** + * This callback should initialize the child process and preload the + * error channel if desired. The preloading of is useful if you want to + * have a message printed directly before the output of the child process. + * pp_cb is the callback cookie as passed to run_processes_parallel. + * You can store a child process specific callback cookie in pp_task_cb. + * + * Even after returning 0 to indicate that there are no more processes, + * this function will be called again until there are no more running + * child processes. + * + * Return 1 if the next child is ready to run. + * Return 0 if there are currently no more tasks to be processed. + * To send a signal to other child processes for abortion, + * return the negative signal number. + */ +typedef int (*get_next_task_fn)(struct child_process *cp, + struct strbuf *out, + void *pp_cb, + void **pp_task_cb); + +/** + * This callback is called whenever there are problems starting + * a new process. + * + * You must not write to stdout or stderr in this function. Add your + * message to the strbuf out instead, which will be printed without + * messing up the output of the other parallel processes. + * + * pp_cb is the callback cookie as passed into run_processes_parallel, + * pp_task_cb is the callback cookie as passed into get_next_task_fn. + * + * Return 0 to continue the parallel processing. To abort return non zero. + * To send a signal to other child processes for abortion, return + * the negative signal number. + */ +typedef int (*start_failure_fn)(struct strbuf *out, + void *pp_cb, + void *pp_task_cb); + +/** + * This callback is called on every child process that finished processing. + * + * You must not write to stdout or stderr in this function. Add your + * message to the strbuf out instead, which will be printed without + * messing up the output of the other parallel processes. + * + * pp_cb is the callback cookie as passed into run_processes_parallel, + * pp_task_cb is the callback cookie as passed into get_next_task_fn. + * + * Return 0 to continue the parallel processing. To abort return non zero. + * To send a signal to other child processes for abortion, return + * the negative signal number. + */ +typedef int (*task_finished_fn)(int result, + struct strbuf *out, + void *pp_cb, + void *pp_task_cb); + +/** + * Runs up to n processes at the same time. Whenever a process can be + * started, the callback get_next_task_fn is called to obtain the data + * required to start another child process. + * + * The children started via this function run in parallel. Their output + * (both stdout and stderr) is routed to stderr in a manner that output + * from different tasks does not interleave. + * + * start_failure_fn and task_finished_fn can be NULL to omit any + * special handling. + */ +int run_processes_parallel(int n, + get_next_task_fn, + start_failure_fn, + task_finished_fn, + void *pp_cb); #endif |