#ifndef RUN_COMMAND_H #define RUN_COMMAND_H #ifndef NO_PTHREADS #include <pthread.h> #endif struct child_process { const char **argv; 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 (*preexec_cb)(void); }; int start_command(struct child_process *); int finish_command(struct child_process *); int run_command(struct child_process *); extern int run_hook(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 #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); /* * 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 start_async(struct async *async); int finish_async(struct async *async); #endif