#include "run-command.h"
#include "exec_cmd.h"
-int run_command_v_opt(const char **argv, int flags)
+static inline void close_pair(int fd[2])
{
- pid_t pid = fork();
+ close(fd[0]);
+ close(fd[1]);
+}
+
+static inline void dup_devnull(int to)
+{
+ int fd = open("/dev/null", O_RDWR);
+ dup2(fd, to);
+ close(fd);
+}
+
+int start_command(struct child_process *cmd)
+{
+ int need_in, need_out, need_err;
+ int fdin[2], fdout[2], fderr[2];
- if (pid < 0)
+ need_in = !cmd->no_stdin && cmd->in < 0;
+ if (need_in) {
+ if (pipe(fdin) < 0)
+ return -ERR_RUN_COMMAND_PIPE;
+ cmd->in = fdin[1];
+ cmd->close_in = 1;
+ }
+
+ need_out = !cmd->no_stdout
+ && !cmd->stdout_to_stderr
+ && cmd->out < 0;
+ if (need_out) {
+ if (pipe(fdout) < 0) {
+ if (need_in)
+ close_pair(fdin);
+ return -ERR_RUN_COMMAND_PIPE;
+ }
+ cmd->out = fdout[0];
+ cmd->close_out = 1;
+ }
+
+ need_err = !cmd->no_stderr && cmd->err < 0;
+ if (need_err) {
+ if (pipe(fderr) < 0) {
+ if (need_in)
+ close_pair(fdin);
+ if (need_out)
+ close_pair(fdout);
+ return -ERR_RUN_COMMAND_PIPE;
+ }
+ cmd->err = fderr[0];
+ }
+
+ cmd->pid = fork();
+ if (cmd->pid < 0) {
+ if (need_in)
+ close_pair(fdin);
+ if (need_out)
+ close_pair(fdout);
+ if (need_err)
+ close_pair(fderr);
return -ERR_RUN_COMMAND_FORK;
- if (!pid) {
- if (flags & RUN_COMMAND_NO_STDIN) {
- int fd = open("/dev/null", O_RDWR);
- dup2(fd, 0);
- close(fd);
+ }
+
+ if (!cmd->pid) {
+ if (cmd->no_stdin)
+ dup_devnull(0);
+ else if (need_in) {
+ dup2(fdin[0], 0);
+ close_pair(fdin);
+ } else if (cmd->in) {
+ dup2(cmd->in, 0);
+ close(cmd->in);
}
- if (flags & RUN_COMMAND_STDOUT_TO_STDERR)
+
+ if (cmd->no_stdout)
+ dup_devnull(1);
+ else if (cmd->stdout_to_stderr)
dup2(2, 1);
- if (flags & RUN_GIT_CMD) {
- execv_git_cmd(argv);
+ else if (need_out) {
+ dup2(fdout[1], 1);
+ close_pair(fdout);
+ } else if (cmd->out > 1) {
+ dup2(cmd->out, 1);
+ close(cmd->out);
+ }
+
+ if (cmd->no_stderr)
+ dup_devnull(2);
+ else if (need_err) {
+ dup2(fderr[1], 2);
+ close_pair(fderr);
+ }
+
+ if (cmd->dir && chdir(cmd->dir))
+ die("exec %s: cd to %s failed (%s)", cmd->argv[0],
+ cmd->dir, strerror(errno));
+ if (cmd->env) {
+ for (; *cmd->env; cmd->env++) {
+ if (strchr(*cmd->env, '='))
+ putenv((char*)*cmd->env);
+ else
+ unsetenv(*cmd->env);
+ }
+ }
+ if (cmd->git_cmd) {
+ execv_git_cmd(cmd->argv);
} else {
- execvp(argv[0], (char *const*) argv);
+ execvp(cmd->argv[0], (char *const*) cmd->argv);
}
- die("exec %s failed.", argv[0]);
+ die("exec %s failed.", cmd->argv[0]);
}
+
+ if (need_in)
+ close(fdin[0]);
+ else if (cmd->in)
+ close(cmd->in);
+
+ if (need_out)
+ close(fdout[1]);
+ else if (cmd->out > 1)
+ close(cmd->out);
+
+ if (need_err)
+ close(fderr[1]);
+
+ return 0;
+}
+
+static int wait_or_whine(pid_t pid)
+{
for (;;) {
int status, code;
pid_t waiting = waitpid(pid, &status, 0);
}
}
-int run_command_v(const char **argv)
+int finish_command(struct child_process *cmd)
{
- return run_command_v_opt(argv, 0);
+ if (cmd->close_in)
+ close(cmd->in);
+ if (cmd->close_out)
+ close(cmd->out);
+ return wait_or_whine(cmd->pid);
}
-static int run_command_va_opt(int opt, const char *cmd, va_list param)
+int run_command(struct child_process *cmd)
{
- int argc;
- const char *argv[MAX_RUN_COMMAND_ARGS];
- const char *arg;
-
- argv[0] = (char*) cmd;
- argc = 1;
- while (argc < MAX_RUN_COMMAND_ARGS) {
- arg = argv[argc++] = va_arg(param, char *);
- if (!arg)
- break;
- }
- if (MAX_RUN_COMMAND_ARGS <= argc)
- return error("too many args to run %s", cmd);
- return run_command_v_opt(argv, opt);
+ int code = start_command(cmd);
+ if (code)
+ return code;
+ return finish_command(cmd);
+}
+
+static void prepare_run_command_v_opt(struct child_process *cmd,
+ const char **argv,
+ int opt)
+{
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->argv = argv;
+ cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
+ cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
+ cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
+}
+
+int run_command_v_opt(const char **argv, int opt)
+{
+ struct child_process cmd;
+ prepare_run_command_v_opt(&cmd, argv, opt);
+ return run_command(&cmd);
+}
+
+int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
+{
+ struct child_process cmd;
+ prepare_run_command_v_opt(&cmd, argv, opt);
+ cmd.dir = dir;
+ return run_command(&cmd);
}
-int run_command_opt(int opt, const char *cmd, ...)
+int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
{
- va_list params;
- int r;
+ struct child_process cmd;
+ prepare_run_command_v_opt(&cmd, argv, opt);
+ cmd.dir = dir;
+ cmd.env = env;
+ return run_command(&cmd);
+}
- va_start(params, cmd);
- r = run_command_va_opt(opt, cmd, params);
- va_end(params);
- return r;
+int start_async(struct async *async)
+{
+ int pipe_out[2];
+
+ if (pipe(pipe_out) < 0)
+ return error("cannot create pipe: %s", strerror(errno));
+
+ async->pid = fork();
+ if (async->pid < 0) {
+ error("fork (async) failed: %s", strerror(errno));
+ close_pair(pipe_out);
+ return -1;
+ }
+ if (!async->pid) {
+ close(pipe_out[0]);
+ exit(!!async->proc(pipe_out[1], async->data));
+ }
+ async->out = pipe_out[0];
+ close(pipe_out[1]);
+ return 0;
}
-int run_command(const char *cmd, ...)
+int finish_async(struct async *async)
{
- va_list params;
- int r;
+ int ret = 0;
- va_start(params, cmd);
- r = run_command_va_opt(0, cmd, params);
- va_end(params);
- return r;
+ if (wait_or_whine(async->pid))
+ ret = error("waitpid (async) failed");
+ return ret;
}