+2006-03-17 Jim Blandy <jimb@codesourcery.com>
+
+ Add support for 'target remote |' on MinGW.
+ * ser-mingw.c (struct pipe_state): New structure.
+ (make_pipe_state, free_pipe_state, cleanup_pipe_state)
+ (pipe_windows_open, pipe_windows_close, pipe_windows_read)
+ (pipe_windows_write, pipe_wait_handle): New functions.
+ (_initialize_ser_windows): Register a "pipe" interface based on
+ them.
+
2006-02-26 Mark Kettenis <kettenis@gnu.org>
* i386obsd-tdep.c (i386obsd_trapframe_sniffer): Also recognize
return NULL;
}
+struct pipe_state
+{
+ /* Since we use the pipe_select_thread for our select emulation,
+ we need to place the state structure it requires at the front
+ of our state. */
+ struct ser_console_state wait;
+
+ /* The pex obj for our (one-stage) pipeline. */
+ struct pex_obj *pex;
+
+ /* Streams for the pipeline's input and output. */
+ FILE *input, *output;
+};
+
+static struct pipe_state *
+make_pipe_state (void)
+{
+ struct pipe_state *ps = XMALLOC (struct pipe_state);
+
+ memset (ps, 0, sizeof (*ps));
+ ps->wait.read_event = INVALID_HANDLE_VALUE;
+ ps->wait.except_event = INVALID_HANDLE_VALUE;
+ ps->wait.start_select = INVALID_HANDLE_VALUE;
+ ps->wait.stop_select = INVALID_HANDLE_VALUE;
+
+ return ps;
+}
+
+static void
+free_pipe_state (struct pipe_state *ps)
+{
+ int saved_errno = errno;
+
+ if (ps->wait.read_event != INVALID_HANDLE_VALUE)
+ CloseHandle (ps->wait.read_event);
+ if (ps->wait.except_event != INVALID_HANDLE_VALUE)
+ CloseHandle (ps->wait.except_event);
+ if (ps->wait.start_select != INVALID_HANDLE_VALUE)
+ CloseHandle (ps->wait.start_select);
+
+ /* If we have a select thread running, let the select thread free
+ the stop event. */
+ if (ps->wait.stop_select != INVALID_HANDLE_VALUE)
+ SetEvent (ps->wait.stop_select);
+
+ if (ps->pex)
+ pex_free (ps->pex);
+ if (ps->input)
+ fclose (ps->input);
+ /* pex_free closes ps->output. */
+
+ xfree (ps);
+
+ errno = saved_errno;
+}
+
+static void
+cleanup_pipe_state (void *untyped)
+{
+ struct pipe_state *ps = untyped;
+
+ free_pipe_state (ps);
+}
+
+static int
+pipe_windows_open (struct serial *scb, const char *name)
+{
+ char **argv = buildargv (name);
+ struct cleanup *back_to = make_cleanup_freeargv (argv);
+ if (! argv[0] || argv[0][0] == '\0')
+ error ("missing child command");
+
+ struct pipe_state *ps = make_pipe_state ();
+ make_cleanup (cleanup_pipe_state, ps);
+
+ ps->pex = pex_init (PEX_USE_PIPES, "target remote pipe", NULL);
+ if (! ps->pex)
+ goto fail;
+ ps->input = pex_write_input (ps->pex, 1);
+ if (! ps->input)
+ goto fail;
+
+ {
+ int err;
+ const char *err_msg
+ = pex_run (ps->pex, PEX_SEARCH | PEX_BINARY_INPUT | PEX_BINARY_OUTPUT,
+ argv[0], argv, NULL, NULL,
+ &err);
+
+ if (err_msg)
+ {
+ /* Our caller expects us to return -1, but all they'll do with
+ it generally is print the message based on errno. We have
+ all the same information here, plus err_msg provided by
+ pex_run, so we just raise the error here. */
+ if (err)
+ error ("error starting child process '%s': %s: %s",
+ name, err_msg, safe_strerror (err));
+ else
+ error ("error starting child process '%s': %s",
+ name, err_msg);
+ }
+ }
+
+ ps->output = pex_read_output (ps->pex, 1);
+ if (! ps->output)
+ goto fail;
+
+ scb->fd = fileno (ps->output);
+ scb->state = (void *) ps;
+
+ discard_cleanups (back_to);
+ return 0;
+
+ fail:
+ do_cleanups (back_to);
+ return -1;
+}
+
+
+static void
+pipe_windows_close (struct serial *scb)
+{
+ struct pipe_state *ps = scb->state;
+
+ /* In theory, we should try to kill the subprocess here, but the pex
+ interface doesn't give us enough information to do that. Usually
+ closing the input pipe will get the message across. */
+
+ free_pipe_state (ps);
+}
+
+
+static int
+pipe_windows_read (struct serial *scb, size_t count)
+{
+ HANDLE pipeline_out = (HANDLE) _get_osfhandle (scb->fd);
+ if (pipeline_out == INVALID_HANDLE_VALUE)
+ return -1;
+
+ DWORD available;
+ if (! PeekNamedPipe (pipeline_out, NULL, 0, NULL, &available, NULL))
+ return -1;
+
+ if (count > available)
+ count = available;
+
+ DWORD bytes_read;
+ if (! ReadFile (pipeline_out, scb->buf, count, &bytes_read, NULL))
+ return -1;
+
+ return bytes_read;
+}
+
+
+static int
+pipe_windows_write (struct serial *scb, const void *buf, size_t count)
+{
+ struct pipe_state *ps = scb->state;
+ int pipeline_in_fd = fileno (ps->input);
+ if (pipeline_in_fd < 0)
+ return -1;
+
+ HANDLE pipeline_in = (HANDLE) _get_osfhandle (pipeline_in_fd);
+ if (pipeline_in == INVALID_HANDLE_VALUE)
+ return -1;
+
+ DWORD written;
+ if (! WriteFile (pipeline_in, buf, count, &written, NULL))
+ return -1;
+
+ return written;
+}
+
+
+static void
+pipe_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
+{
+ struct pipe_state *ps = scb->state;
+
+ /* Have we allocated our events yet? */
+ if (ps->wait.read_event == INVALID_HANDLE_VALUE)
+ {
+ DWORD threadId;
+
+ /* Create auto reset events to wake and terminate the select thread. */
+ ps->wait.start_select = CreateEvent (0, FALSE, FALSE, 0);
+ ps->wait.stop_select = CreateEvent (0, FALSE, FALSE, 0);
+
+ /* Create our own events to report read and exceptions separately.
+ The exception event is currently never used. */
+ ps->wait.read_event = CreateEvent (0, FALSE, FALSE, 0);
+ ps->wait.except_event = CreateEvent (0, FALSE, FALSE, 0);
+
+ /* Start the select thread. */
+ CreateThread (NULL, 0, pipe_select_thread, scb, 0, &threadId);
+ }
+
+ ResetEvent (ps->wait.read_event);
+ ResetEvent (ps->wait.except_event);
+
+ SetEvent (ps->wait.start_select);
+
+ *read = ps->wait.read_event;
+ *except = ps->wait.except_event;
+}
+
+
struct net_windows_state
{
HANDLE read_event;
serial_add_interface (ops);
+ /* The pipe interface. */
+
+ ops = XMALLOC (struct serial_ops);
+ memset (ops, 0, sizeof (struct serial_ops));
+ ops->name = "pipe";
+ ops->next = 0;
+ ops->open = pipe_windows_open;
+ ops->close = pipe_windows_close;
+ ops->readchar = ser_base_readchar;
+ ops->write = ser_base_write;
+ ops->flush_output = ser_base_flush_output;
+ ops->flush_input = ser_base_flush_input;
+ ops->send_break = ser_base_send_break;
+ ops->go_raw = ser_base_raw;
+ ops->get_tty_state = ser_base_get_tty_state;
+ ops->set_tty_state = ser_base_set_tty_state;
+ ops->print_tty_state = ser_base_print_tty_state;
+ ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
+ ops->setbaudrate = ser_base_setbaudrate;
+ ops->setstopbits = ser_base_setstopbits;
+ ops->drain_output = ser_base_drain_output;
+ ops->async = ser_base_async;
+ ops->read_prim = pipe_windows_read;
+ ops->write_prim = pipe_windows_write;
+ ops->wait_handle = pipe_wait_handle;
+
+ serial_add_interface (ops);
+
/* If WinSock works, register the TCP/UDP socket driver. */
if (WSAStartup (MAKEWORD (1, 0), &wsa_data) != 0)
+2006-03-15 Jim Blandy <jimb@codesourcery.com>
+
+ * libiberty.h (pex_write_input): New declaration.
+
2006-02-17 Shrirang Khisti <shrirangk@kpitcummins.com>
Anil Paranjape <anilp1@kpitcummins.com>
Shilin Shakti <shilins@kpitcummins.com>
const char *outname, const char *errname,
int *err);
+/* Return a `FILE' pointer FP for the standard input of the first
+ program in the pipeline; FP is opened for writing. You must have
+ passed `PEX_USE_PIPES' to the `pex_init' call that returned OBJ.
+ You must close FP yourself with `fclose' to indicate that the
+ pipeline's input is complete.
+
+ The file descriptor underlying FP is marked not to be inherited by
+ child processes.
+
+ This call is not supported on systems which do not support pipes;
+ it returns with an error. (We could implement it by writing a
+ temporary file, but then you would need to write all your data and
+ close FP before your first call to `pex_run' -- and that wouldn't
+ work on systems that do support pipes: the pipe would fill up, and
+ you would block. So there isn't any easy way to conceal the
+ differences between the two types of systems.)
+
+ If you call both `pex_write_input' and `pex_read_output', be
+ careful to avoid deadlock. If the output pipe fills up, so that
+ each program in the pipeline is waiting for the next to read more
+ data, and you fill the input pipe by writing more data to FP, then
+ there is no way to make progress: the only process that could read
+ data from the output pipe is you, but you are blocked on the input
+ pipe. */
+
+extern FILE *pex_write_input (struct pex_obj *obj, int binary);
+
/* Read the standard output of the last program to be executed.
pex_run can not be called after this. BINARY should be non-zero if
the file should be opened in binary mode; this is ignored on Unix.
+2006-03-15 Jim Blandy <jimb@codesourcery.com>
+
+ * pex-common.c (pex_write_input): New function.
+ * pexecute.txh (pex_write_input): Document it.
+ * pex-common.h (struct pex_funcs): New function ptr fdopenw.
+ * pex-unix.c (pex_unix_fdopenw): New function.
+ (funcs): List it as our fdopenw function.
+ * pex-win32.c (pex_win32_fdopenw): New function.
+ (funcs): List it as our fdopenw function.
+ * pex-djgpp.c (funcs): Leave fdopenw null.
+ * pex-msdos (funcs): Same.
+ * functions.texi: Regenerated.
+
+2006-03-12 Jim Blandy <jimb@red-bean.com>
+
+ * pex-common.h (struct pex_obj): Doc fixes.
+
+2006-03-11 Jim Blandy <jimb@red-bean.com>
+
+ * functions.texi: Regenerate.
+
2006-02-21 Ben Elliston <bje@au.ibm.com>
* pexecute.c (pwait): Syntax fix for previous change.
@end deftypefn
+@c argv.c:293
+@deftypefn Extension void expandargv (int *@var{argcp}, char ***@var{argvp})
+
+The @var{argcp} and @code{argvp} arguments are pointers to the usual
+@code{argc} and @code{argv} arguments to @code{main}. This function
+looks for arguments that begin with the character @samp{@@}. Any such
+arguments are interpreted as ``response files''. The contents of the
+response file are interpreted as additional command line options. In
+particular, the file is separated into whitespace-separated strings;
+each such string is taken as a command-line option. The new options
+are inserted in place of the option naming the response file, and
+@code{*argcp} and @code{*argvp} will be updated. If the value of
+@code{*argvp} is modified by this function, then the new value has
+been dynamically allocated and can be deallocated by the caller with
+@code{freeargv}. However, most callers will simply call
+@code{expandargv} near the beginning of @code{main} and allow the
+operating system to free the memory when the program exits.
+
+@end deftypefn
+
@c fdmatch.c:23
@deftypefn Extension int fdmatch (int @var{fd1}, int @var{fd2})
@end deftypefn
-@c pexecute.txh:169
+@c pexecute.txh:198
@deftypefn Extension void pex_free (struct pex_obj @var{obj})
Clean up and free all data associated with @var{obj}.
@end deftypefn
-@c pexecute.txh:144
+@c pexecute.txh:173
@deftypefn Extension int pex_get_status (struct pex_obj *@var{obj}, int @var{count}, int *@var{vector})
Returns the exit status of all programs run using @var{obj}.
@end deftypefn
-@c pexecute.txh:153
+@c pexecute.txh:182
@deftypefn Extension int pex_get_times (struct pex_obj *@var{obj}, int @var{count}, struct pex_time *@var{vector})
Returns the process execution times of all programs run using
@end deftypefn
-@c pexecute.txh:1
+@c pexecute.txh:2
@deftypefn Extension {struct pex_obj *} pex_init (int @var{flags}, const char *@var{pname}, const char *@var{tempbase})
Prepare to execute one or more programs, with standard output of each
@end deftypefn
-@c pexecute.txh:175
+@c pexecute.txh:204
@deftypefn Extension {const char *} pex_one (int @var{flags}, const char *@var{executable}, char * const *@var{argv}, const char *@var{pname}, const char *@var{outname}, const char *@var{errname}, int *@var{status}, int *@var{err})
An interface to permit the easy execution of a
@end deftypefn
-@c pexecute.txh:132
+@c pexecute.txh:161
@deftypefn Extension {FILE *} pex_read_output (struct pex_obj *@var{obj}, int @var{binary})
Returns a @code{FILE} pointer which may be used to read the standard
@end deftypefn
-@c pexecute.txh:32
+@c pexecute.txh:33
@deftypefn Extension {const char *} pex_run (struct pex_obj *@var{obj}, int @var{flags}, const char *@var{executable}, char * const *@var{argv}, const char *@var{outname}, const char *@var{errname}, int *@var{err})
Execute one program in a pipeline. On success this returns
@end deftypefn
-@c pexecute.txh:187
+@c pexecute.txh:133
+@deftypefn Extension {FILE *} pex_write_input (struct pex_obj *@var{obj}, int @var{binary})
+
+Return a @code{FILE} pointer @var{fp} for the standard input of the
+first program in the pipeline; @var{fp} is opened for writing. You
+must have passed @code{PEX_USE_PIPES} to the @code{pex_init} call that
+returned @var{obj}. You must close @var{fp} yourself with
+@code{fclose} to indicate that the pipeline's input is complete.
+
+The file descriptor underlying @var{fp} is marked not to be inherited
+by child processes.
+
+This call is not supported on systems which do not support pipes; it
+returns with an error. (We could implement it by writing a temporary
+file, but then you would need to write all your data and close
+@var{fp} before your first call to @code{pex_run} --- and that
+wouldn't work on systems that do support pipes: the pipe would fill
+up, and you would block. So there isn't any easy way to conceal the
+differences between the two types of systems.)
+
+If you call both @code{pex_write_input} and @code{pex_read_output}, be
+careful to avoid deadlock. If the output pipe fills up, so that each
+program in the pipeline is waiting for the next to read more data, and
+you fill the input pipe by writing more data to @var{fp}, then there
+is no way to make progress: the only process that could read data from
+the output pipe is you, but you are blocked on the input pipe.
+
+@end deftypefn
+
+@c pexecute.txh:216
@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)
This is the old interface to execute one or more programs. It is
@end deftypefn
-@c pexecute.txh:195
+@c pexecute.txh:224
@deftypefn Extension int pwait (int @var{pid}, int *@var{status}, int @var{flags})
Another part of the old execution interface.
@end deftypefn
-@c strverscmp.c:24
+@c strverscmp.c:25
@deftypefun int strverscmp (const char *@var{s1}, const char *@var{s2})
The @code{strverscmp} function compares the string @var{s1} against
@var{s2}, considering them as holding indices/version numbers. Return
return errmsg;
}
+/* Return a FILE pointer for the input of the first program
+ executed. */
+
+FILE *
+pex_write_input (struct pex_obj *obj, int binary)
+{
+ int p[2];
+ FILE *write_input;
+
+ /* You must call pex_write_input before the first pex_run or pex_one. */
+ if (obj->count > 0)
+ goto usage_error;
+
+ /* You must be using pipes. Implementations that don't support
+ pipes clear this flag before calling pex_init_common. */
+ if (! (obj->flags & PEX_USE_PIPES))
+ goto usage_error;
+
+ /* If we have somehow already selected other input, that's a
+ mistake. */
+ if ((obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)
+ || obj->next_input_name)
+ goto usage_error;
+
+ if (obj->funcs->pipe (obj, p, binary != 0) < 0)
+ return NULL;
+
+ write_input = obj->funcs->fdopenw (obj, p[WRITE_PORT], binary != 0);
+ if (! write_input)
+ {
+ int saved_errno = errno;
+ obj->funcs->close (obj, p[READ_PORT]);
+ obj->funcs->close (obj, p[WRITE_PORT]);
+ errno = saved_errno;
+ return NULL;
+ }
+
+ obj->next_input = p[READ_PORT];
+
+ return write_input;
+
+ usage_error:
+ errno = EINVAL;
+ return NULL;
+}
+
/* Return a FILE pointer for the output of the last program
executed. */
int next_input_name_allocated;
/* Number of child processes. */
int count;
- /* PIDs of child processes; array allocated using maloc. */
+ /* PIDs of child processes; array allocated using malloc. */
long *children;
/* Exit statuses of child processes; array allocated using malloc. */
int *status;
{
/* Open file NAME for reading. If BINARY is non-zero, open in
binary mode. Return >= 0 on success, -1 on error. */
- int (*open_read) (struct pex_obj *, const char *name, int binary);
+ int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
/* Open file NAME for writing. If BINARY is non-zero, open in
binary mode. Return >= 0 on success, -1 on error. */
- int (*open_write) (struct pex_obj *, const char *name, int binary);
+ int (*open_write) (struct pex_obj *, const char */* name */,
+ int /* binary */);
/* Execute a child process. FLAGS, EXECUTABLE, ARGV, ERR are from
pex_run. IN, OUT, ERRDES are each a descriptor, from open_read,
open_write, or pipe, or they are one of STDIN_FILE_NO,
should be closed. The function should handle the
PEX_STDERR_TO_STDOUT flag. Return >= 0 on success, or -1 on
error and set *ERRMSG and *ERR. */
- long (*exec_child) (struct pex_obj *, int flags, const char *executable,
- char * const * argv, int in, int out, int errdes,
- const char **errmsg, int *err);
+ long (*exec_child) (struct pex_obj *, int /* flags */,
+ const char */* executable */, char * const * /* argv */,
+ int /* in */, int /* out */, int /* errdes */,
+ const char **/* errmsg */, int */* err */);
/* Close a descriptor. Return 0 on success, -1 on error. */
int (*close) (struct pex_obj *, int);
/* Wait for a child to complete, returning exit status in *STATUS
and time in *TIME (if it is not null). CHILD is from fork. DONE
is 1 if this is called via pex_free. ERRMSG and ERR are as in
fork. Return 0 on success, -1 on error. */
- int (*wait) (struct pex_obj *, long, int *status, struct pex_time *time,
- int done, const char **errmsg, int *err);
+ int (*wait) (struct pex_obj *, long /* child */, int * /* status */,
+ struct pex_time * /* time */, int /* done */,
+ const char ** /* errmsg */, int * /* err */);
/* Create a pipe (only called if PEX_USE_PIPES is set) storing two
- descriptin in *P. If BINARY is non-zero, open in binary mode.
- Return 0 on success, -1 on error. */
- int (*pipe) (struct pex_obj *, int *p, int binary);
+ descriptors in P[0] and P[1]. If BINARY is non-zero, open in
+ binary mode. Return 0 on success, -1 on error. */
+ int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
/* Get a FILE pointer to read from a file descriptor (only called if
PEX_USE_PIPES is set). If BINARY is non-zero, open in binary
mode. Return pointer on success, NULL on error. */
- FILE * (*fdopenr) (struct pex_obj *, int fd, int binary);
+ FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
+ /* Get a FILE pointer to write to the file descriptor FD (only
+ called if PEX_USE_PIPES is set). If BINARY is non-zero, open in
+ binary mode. Arrange for FD not to be inherited by the child
+ processes. Return pointer on success, NULL on error. */
+ FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
/* Free any system dependent data associated with OBJ. May be
NULL if there is nothing to do. */
void (*cleanup) (struct pex_obj *);
pex_djgpp_wait,
NULL, /* pipe */
NULL, /* fdopenr */
+ NULL, /* fdopenw */
NULL /* cleanup */
};
pex_msdos_wait,
NULL, /* pipe */
NULL, /* fdopenr */
+ NULL, /* fdopenw */
pex_msdos_cleanup
};
int, const char **, int *);
static int pex_unix_pipe (struct pex_obj *, int *, int);
static FILE *pex_unix_fdopenr (struct pex_obj *, int, int);
+static FILE *pex_unix_fdopenw (struct pex_obj *, int, int);
static void pex_unix_cleanup (struct pex_obj *);
/* The list of functions we pass to the common routines. */
pex_unix_wait,
pex_unix_pipe,
pex_unix_fdopenr,
+ pex_unix_fdopenw,
pex_unix_cleanup
};
return fdopen (fd, "r");
}
+static FILE *
+pex_unix_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
+ int binary ATTRIBUTE_UNUSED)
+{
+ if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
+ return NULL;
+ return fdopen (fd, "w");
+}
+
static void
pex_unix_cleanup (struct pex_obj *obj ATTRIBUTE_UNUSED)
{
struct pex_time *, int, const char **, int *);
static int pex_win32_pipe (struct pex_obj *, int *, int);
static FILE *pex_win32_fdopenr (struct pex_obj *, int, int);
+static FILE *pex_win32_fdopenw (struct pex_obj *, int, int);
/* The list of functions we pass to the common routines. */
pex_win32_wait,
pex_win32_pipe,
pex_win32_fdopenr,
+ pex_win32_fdopenw,
NULL /* cleanup */
};
return fdopen (fd, binary ? "rb" : "r");
}
+static FILE *
+pex_win32_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
+ int binary)
+{
+ HANDLE h = (HANDLE) _get_osfhandle (fd);
+ if (h == INVALID_HANDLE_VALUE)
+ return NULL;
+ if (! SetHandleInformation (h, HANDLE_FLAG_INHERIT, 0))
+ return NULL;
+ return fdopen (fd, binary ? "wb" : "w");
+}
+
#ifdef MAIN
#include <stdio.h>
+@c -*- mode: texinfo -*-
@deftypefn Extension {struct pex_obj *} pex_init (int @var{flags}, const char *@var{pname}, const char *@var{tempbase})
Prepare to execute one or more programs, with standard output of each
@end deftypefn
+@deftypefn Extension {FILE *} pex_write_input (struct pex_obj *@var{obj}, int @var{binary})
+
+Return a @code{FILE} pointer @var{fp} for the standard input of the
+first program in the pipeline; @var{fp} is opened for writing. You
+must have passed @code{PEX_USE_PIPES} to the @code{pex_init} call that
+returned @var{obj}. You must close @var{fp} yourself with
+@code{fclose} to indicate that the pipeline's input is complete.
+
+The file descriptor underlying @var{fp} is marked not to be inherited
+by child processes.
+
+This call is not supported on systems which do not support pipes; it
+returns with an error. (We could implement it by writing a temporary
+file, but then you would need to write all your data and close
+@var{fp} before your first call to @code{pex_run} --- and that
+wouldn't work on systems that do support pipes: the pipe would fill
+up, and you would block. So there isn't any easy way to conceal the
+differences between the two types of systems.)
+
+If you call both @code{pex_write_input} and @code{pex_read_output}, be
+careful to avoid deadlock. If the output pipe fills up, so that each
+program in the pipeline is waiting for the next to read more data, and
+you fill the input pipe by writing more data to @var{fp}, then there
+is no way to make progress: the only process that could read data from
+the output pipe is you, but you are blocked on the input pipe.
+
+@end deftypefn
+
@deftypefn Extension {FILE *} pex_read_output (struct pex_obj *@var{obj}, int @var{binary})
Returns a @code{FILE} pointer which may be used to read the standard
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