| 1 | @deftypefn Extension int pexecute (const char *@var{program}, char * const *@var{argv}, const char *@var{this_pname}, const char *@var{temp_base}, char **@var{errmsg_fmt}, char **@var{errmsg_arg}, int flags)
|
|---|
| 2 |
|
|---|
| 3 | Executes a program.
|
|---|
| 4 |
|
|---|
| 5 | @var{program} and @var{argv} are the arguments to
|
|---|
| 6 | @code{execv}/@code{execvp}.
|
|---|
| 7 |
|
|---|
| 8 | @var{this_pname} is name of the calling program (i.e., @code{argv[0]}).
|
|---|
| 9 |
|
|---|
| 10 | @var{temp_base} is the path name, sans suffix, of a temporary file to
|
|---|
| 11 | use if needed. This is currently only needed for MS-DOS ports that
|
|---|
| 12 | don't use @code{go32} (do any still exist?). Ports that don't need it
|
|---|
| 13 | can pass @code{NULL}.
|
|---|
| 14 |
|
|---|
| 15 | (@code{@var{flags} & PEXECUTE_SEARCH}) is non-zero if @env{PATH}
|
|---|
| 16 | should be searched (??? It's not clear that GCC passes this flag
|
|---|
| 17 | correctly). (@code{@var{flags} & PEXECUTE_FIRST}) is nonzero for the
|
|---|
| 18 | first process in chain. (@code{@var{flags} & PEXECUTE_FIRST}) is
|
|---|
| 19 | nonzero for the last process in chain. The first/last flags could be
|
|---|
| 20 | simplified to only mark the last of a chain of processes but that
|
|---|
| 21 | requires the caller to always mark the last one (and not give up
|
|---|
| 22 | early if some error occurs). It's more robust to require the caller
|
|---|
| 23 | to mark both ends of the chain.
|
|---|
| 24 |
|
|---|
| 25 | The result is the pid on systems like Unix where we
|
|---|
| 26 | @code{fork}/@code{exec} and on systems like WIN32 and OS/2 where we
|
|---|
| 27 | use @code{spawn}. It is up to the caller to wait for the child.
|
|---|
| 28 |
|
|---|
| 29 | The result is the @code{WEXITSTATUS} on systems like MS-DOS where we
|
|---|
| 30 | @code{spawn} and wait for the child here.
|
|---|
| 31 |
|
|---|
| 32 | Upon failure, @var{errmsg_fmt} and @var{errmsg_arg} are set to the
|
|---|
| 33 | text of the error message with an optional argument (if not needed,
|
|---|
| 34 | @var{errmsg_arg} is set to @code{NULL}), and @minus{}1 is returned.
|
|---|
| 35 | @code{errno} is available to the caller to use.
|
|---|
| 36 |
|
|---|
| 37 | @end deftypefn
|
|---|
| 38 |
|
|---|
| 39 | @deftypefn Extension int pwait (int @var{pid}, int *@var{status}, int @var{flags})
|
|---|
| 40 |
|
|---|
| 41 | Waits for a program started by @code{pexecute} to finish.
|
|---|
| 42 |
|
|---|
| 43 | @var{pid} is the process id of the task to wait for. @var{status} is
|
|---|
| 44 | the `status' argument to wait. @var{flags} is currently unused
|
|---|
| 45 | (allows future enhancement without breaking upward compatibility).
|
|---|
| 46 | Pass 0 for now.
|
|---|
| 47 |
|
|---|
| 48 | The result is the pid of the child reaped, or -1 for failure
|
|---|
| 49 | (@code{errno} says why).
|
|---|
| 50 |
|
|---|
| 51 | On systems that don't support waiting for a particular child,
|
|---|
| 52 | @var{pid} is ignored. On systems like MS-DOS that don't really
|
|---|
| 53 | multitask @code{pwait} is just a mechanism to provide a consistent
|
|---|
| 54 | interface for the caller.
|
|---|
| 55 |
|
|---|
| 56 | @end deftypefn
|
|---|
| 57 |
|
|---|
| 58 | @undocumented pfinish
|
|---|
| 59 |
|
|---|
| 60 | pfinish: finish generation of script
|
|---|
| 61 |
|
|---|
| 62 | pfinish is necessary for systems like MPW where a script is generated
|
|---|
| 63 | that runs the requested programs.
|
|---|
