| #ifndef RUN_COMMAND_H |
| #define RUN_COMMAND_H |
| |
| #ifndef NO_PTHREADS |
| #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: |
| * - Specify 0 for no redirections (child inherits stdin, stdout, |
| * stderr from parent). |
| * - Specify -1 to have a pipe allocated as follows: |
| * .in: returns the writable pipe end; parent writes to it, |
| * the readable pipe end becomes child's stdin |
| * .out, .err: returns the readable pipe end; parent reads from |
| * it, the writable pipe end becomes child's stdout/stderr |
| * The caller of start_command() must close the returned FDs |
| * after it has completed reading from/writing to it! |
| * - Specify > 0 to set a channel to a particular FD as follows: |
| * .in: a readable FD, becomes child's stdin |
| * .out: a writable FD, becomes child's stdout/stderr |
| * .err: a writable FD, becomes child's stderr |
| * The specified FD is closed by start_command(), even in case |
| * of errors! |
| */ |
| int in; |
| int out; |
| int err; |
| const char *dir; |
| const char *const *env; |
| unsigned no_stdin:1; |
| unsigned no_stdout:1; |
| unsigned no_stderr:1; |
| unsigned git_cmd:1; /* if this is to be git sub-command */ |
| unsigned silent_exec_failure:1; |
| unsigned stdout_to_stderr:1; |
| unsigned use_shell:1; |
| unsigned clean_on_exit:1; |
| void (*clean_on_exit_handler)(struct child_process *process); |
| void *clean_on_exit_handler_cbdata; |
| }; |
| |
| #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 *); |
| |
| /* |
| * 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); |
| |
| #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 |
| #define RUN_SILENT_EXEC_FAILURE 8 |
| #define RUN_USING_SHELL 16 |
| #define RUN_CLEAN_ON_EXIT 32 |
| int run_command_v_opt(const char **argv, int opt); |
| |
| /* |
| * env (the environment) is to be formatted like environ: "VAR=VALUE". |
| * To unset an environment variable use just "VAR". |
| */ |
| 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. |
| * |
| * It is expected that no synchronization and mutual exclusion between |
| * the caller and the feed function is necessary so that the function |
| * can run in a thread without interfering with the caller. |
| */ |
| struct async { |
| /* |
| * proc reads from in; closes it before return |
| * proc writes to out; closes it before return |
| * returns 0 on success, non-zero on failure |
| */ |
| int (*proc)(int in, int out, void *data); |
| void *data; |
| int in; /* caller writes here and closes it */ |
| int out; /* caller reads from here and closes it */ |
| #ifdef NO_PTHREADS |
| pid_t pid; |
| #else |
| pthread_t tid; |
| 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 check_pipe(int err); |
| |
| /** |
| * 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 |