tools/lib/subcmd/run-command.h

   1 #ifndef __SUBCMD_RUN_COMMAND_H
   2 #define __SUBCMD_RUN_COMMAND_H
   3
   4 #include <unistd.h>
   5
   6 enum {
   7         ERR_RUN_COMMAND_FORK = 10000,
   8         ERR_RUN_COMMAND_EXEC,
   9         ERR_RUN_COMMAND_PIPE,
  10         ERR_RUN_COMMAND_WAITPID,
  11         ERR_RUN_COMMAND_WAITPID_WRONG_PID,
  12         ERR_RUN_COMMAND_WAITPID_SIGNAL,
  13         ERR_RUN_COMMAND_WAITPID_NOEXIT,
  14 };
  15 #define IS_RUN_COMMAND_ERR(x) (-(x) >= ERR_RUN_COMMAND_FORK)
  16
  17 struct child_process {
  18         const char **argv;
  19         pid_t pid;
  20         /*
  21          * Using .in, .out, .err:
  22          * - Specify 0 for no redirections (child inherits stdin, stdout,
  23          *   stderr from parent).
  24          * - Specify -1 to have a pipe allocated as follows:
  25          *     .in: returns the writable pipe end; parent writes to it,
  26          *          the readable pipe end becomes child's stdin
  27          *     .out, .err: returns the readable pipe end; parent reads from
  28          *          it, the writable pipe end becomes child's stdout/stderr
  29          *   The caller of start_command() must close the returned FDs
  30          *   after it has completed reading from/writing to it!
  31          * - Specify > 0 to set a channel to a particular FD as follows:
  32          *     .in: a readable FD, becomes child's stdin
  33          *     .out: a writable FD, becomes child's stdout/stderr
  34          *     .err > 0 not supported
  35          *   The specified FD is closed by start_command(), even in case
  36          *   of errors!
  37          */
  38         int in;
  39         int out;
  40         int err;
  41         const char *dir;
  42         const char *const *env;
  43         unsigned no_stdin:1;
  44         unsigned no_stdout:1;
  45         unsigned no_stderr:1;
  46         unsigned exec_cmd:1; /* if this is to be external sub-command */
  47         unsigned stdout_to_stderr:1;
  48         void (*preexec_cb)(void);
  49 };
  50
  51 int start_command(struct child_process *);
  52 int finish_command(struct child_process *);
  53 int run_command(struct child_process *);
  54
  55 #define RUN_COMMAND_NO_STDIN 1
  56 #define RUN_EXEC_CMD         2  /*If this is to be external sub-command */
  57 #define RUN_COMMAND_STDOUT_TO_STDERR 4
  58 int run_command_v_opt(const char **argv, int opt);
  59
  60 #endif /* __SUBCMD_RUN_COMMAND_H */