/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it. Generic MSDOS specialization.
- Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005
Free Software Foundation, Inc.
This file is part of the libiberty library.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If not,
-write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA. */
#include "pex-common.h"
#include "safe-ctype.h"
#include <process.h>
-/* MSDOS doesn't multitask, but for the sake of a consistent interface
- the code behaves like it does. pexecute runs the program, tucks the
- exit code away, and returns a "pid". pwait must be called to fetch the
- exit code. */
+/* The structure we keep in obj->sysdep. */
-/* For communicating information from pexecute to pwait. */
-static int last_pid = 0;
-static int last_status = 0;
-static int last_reaped = 0;
+#define PEX_MSDOS_FILE_COUNT 3
-int
-pexecute (const char *program, char * const *argv, const char *this_pname,
- const char *temp_base, char **errmsg_fmt, char **errmsg_arg,
- int flags)
+#define PEX_MSDOS_FD_OFFSET 10
+
+struct pex_msdos
{
- int rc;
- char *scmd, *rf;
- FILE *argfile;
- int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
+ /* An array of file names. We refer to these using file descriptors
+ of 10 + array index. */
+ const char *files[PEX_MSDOS_FILE_COUNT];
+ /* Exit statuses of programs which have been run. */
+ int *statuses;
+};
+
+static int pex_msdos_open (struct pex_obj *, const char *, int);
+static int pex_msdos_open (struct pex_obj *, const char *, int);
+static int pex_msdos_fdindex (struct pex_msdos *, int);
+static long pex_msdos_exec_child (struct pex_obj *, int, const char *,
+ char * const *, char * const *,
+ int, int, int, const char **, int *);
+static int pex_msdos_close (struct pex_obj *, int);
+static int pex_msdos_wait (struct pex_obj *, long, int *, struct pex_time *,
+ int, const char **, int *);
+static void pex_msdos_cleanup (struct pex_obj *);
+
+/* The list of functions we pass to the common routines. */
+
+const struct pex_funcs funcs =
+{
+ pex_msdos_open,
+ pex_msdos_open,
+ pex_msdos_exec_child,
+ pex_msdos_close,
+ pex_msdos_wait,
+ NULL, /* pipe */
+ NULL, /* fdopenr */
+ NULL, /* fdopenw */
+ pex_msdos_cleanup
+};
+
+/* Return a newly initialized pex_obj structure. */
+
+struct pex_obj *
+pex_init (int flags, const char *pname, const char *tempbase)
+{
+ struct pex_obj *ret;
+ int i;
+
+ /* MSDOS does not support pipes. */
+ flags &= ~ PEX_USE_PIPES;
- last_pid++;
- if (last_pid < 0)
- last_pid = 1;
+ ret = pex_init_common (flags, pname, tempbase, funcs);
- if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
+ ret->sysdep = XNEW (struct pex_msdos);
+ for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
+ ret->files[i] = NULL;
+ ret->statuses = NULL;
+
+ return ret;
+}
+
+/* Open a file. FIXME: We ignore the binary argument, since we have
+ no way to handle it. */
+
+static int
+pex_msdos_open (struct pex_obj *obj, const char *name,
+ int binary ATTRIBUTE_UNUSED)
+{
+ struct pex_msdos *ms;
+ int i;
+
+ ms = (struct pex_msdos *) obj->sysdep;
+
+ for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
+ {
+ if (ms->files[i] == NULL)
+ {
+ ms->files[i] = xstrdup (name);
+ return i + PEX_MSDOS_FD_OFFSET;
+ }
+ }
+
+ abort ();
+}
+
+/* Get the index into msdos->files associated with an open file
+ descriptor. */
+
+static int
+pex_msdos_fdindex (struct pex_msdos *ms, int fd)
+{
+ fd -= PEX_MSDOS_FD_OFFSET;
+ if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
abort ();
+ return fd;
+}
+
+
+/* Close a file. */
+
+static int
+pex_msdos_close (struct pex_obj *obj, int fd)
+{
+ struct pex_msdos *ms;
+ int fdinex;
+
+ ms = (struct pex_msdos *) obj->sysdep;
+ fdindex = pe_msdos_fdindex (ms, fd);
+ free (ms->files[fdindex]);
+ ms->files[fdindex] = NULL;
+}
+
+/* Execute a child. */
+
+static long
+pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
+ char * const * argv, char * const * env, int in, int out,
+ int errdes ATTRIBUTE_UNUSED, const char **errmsg,
+ int *err)
+{
+ struct pex_msdos *ms;
+ char *temp_base;
+ int temp_base_allocated;
+ char *rf;
+ int inindex;
+ char *infile;
+ int outindex;
+ char *outfile;
+ char *scmd;
+ FILE *argfile;
+ int i;
+ int status;
+
+ ms = (struct pex_msdos *) obj->sysdep;
+
+ /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
+ and PEX_STDERR_TO_STDOUT. */
+
+ temp_base = obj->temp_base;
+ if (temp_base != NULL)
+ temp_base_allocated = 0;
+ else
+ {
+ temp_base = choose_temp_base ();
+ temp_base_allocated = 1;
+ }
+
+ rf = concat (temp_base, ".gp", NULL);
+
+ if (temp_base_allocated)
+ free (temp_base);
+
+ if (in == STDIN_FILE_NO)
+ {
+ inindex = -1;
+ infile = "";
+ }
+ else
+ {
+ inindex = pex_msdos_fdindex (ms, in);
+ infile = ms->files[inindex];
+ }
+
+ if (out == STDOUT_FILE_NO)
+ {
+ outindex = -1;
+ outfile = "";
+ }
+ else
+ {
+ outindex = pex_msdos_fdindex (ms, out);
+ outfile = ms->files[outindex];
+ }
+
+ scmd = XNEWVEC (char, strlen (program)
+ + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
+ + strlen (rf)
+ + strlen (infile)
+ + strlen (outfile)
+ + 10);
+ sprintf (scmd, "%s%s @%s%s%s%s%s",
+ program,
+ (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
+ rf,
+ inindex != -1 ? " <" : "",
+ infile,
+ outindex != -1 ? " >" : "",
+ outfile);
- if (temp_base == 0)
- temp_base = choose_temp_base ();
- scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
- rf = scmd + strlen(program) + 2 + el;
- sprintf (scmd, "%s%s @%s.gp", program,
- (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
argfile = fopen (rf, "w");
- if (argfile == 0)
+ if (argfile == NULL)
{
- int errno_save = errno;
+ *err = errno;
free (scmd);
- errno = errno_save;
- *errmsg_fmt = "cannot open `%s.gp'";
- *errmsg_arg = temp_base;
+ free (rf);
+ *errmsg = "cannot open temporary command file";
return -1;
}
- for (i=1; argv[i]; i++)
+ for (i = 1; argv[i] != NULL; ++i)
{
- char *cp;
- for (cp = argv[i]; *cp; cp++)
+ char *p;
+
+ for (p = argv[i]; *p != '\0'; ++p)
{
- if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp))
- fputc ('\\', argfile);
- fputc (*cp, argfile);
+ if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
+ putc ('\\', argfile);
+ putc (*p, argfile);
}
- fputc ('\n', argfile);
+ putc ('\n', argfile);
}
- fclose (argfile);
- rc = system (scmd);
+ fclose (argfile);
- {
- int errno_save = errno;
- remove (rf);
- free (scmd);
- errno = errno_save;
- }
+ status = system (scmd);
- if (rc == -1)
+ if (status == -1)
{
- *errmsg_fmt = install_error_msg;
- *errmsg_arg = (char *)program;
+ *err = errno;
+ remove (rf);
+ free (scmd);
+ free (rf);
+ *errmsg = "system";
return -1;
}
- /* Tuck the status away for pwait, and return a "pid". */
- last_status = rc << 8;
- return last_pid;
+ remove (rf);
+ free (scmd);
+ free (rf);
+
+ /* Save the exit status for later. When we are called, obj->count
+ is the number of children which have executed before this
+ one. */
+ ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
+ ms->statuses[obj->count] = status;
+
+ return obj->count;
}
-/* Use ECHILD if available, otherwise use EINVAL. */
-#ifdef ECHILD
-#define PWAIT_ERROR ECHILD
-#else
-#define PWAIT_ERROR EINVAL
-#endif
+/* Wait for a child process to complete. Actually the child process
+ has already completed, and we just need to return the exit
+ status. */
-int
-pwait (int pid, int *status, int flags)
+static int
+pex_msdos_wait (struct pex_obj *obj, long pid, int *status,
+ struct pex_time *time, int done ATTRIBUTE_UNUSED,
+ const char **errmsg ATTRIBUTE_UNUSED,
+ int *err ATTRIBUTE_UNUSED)
{
- /* On MSDOS each pexecute must be followed by its associated pwait. */
- if (pid != last_pid
- /* Called twice for the same child? */
- || pid == last_reaped)
- {
- errno = PWAIT_ERROR;
- return -1;
- }
- /* ??? Here's an opportunity to canonicalize the values in STATUS.
- Needed? */
- *status = last_status;
- last_reaped = last_pid;
- return last_pid;
+ struct pex_msdos *ms;
+
+ ms = (struct pex_msdos *) obj->sysdep;
+
+ if (time != NULL)
+ memset (time, 0, sizeof *time);
+
+ *status = ms->statuses[pid];
+
+ return 0;
+}
+
+/* Clean up the pex_msdos structure. */
+
+static void
+pex_msdos_cleanup (struct pex_obj *obj)
+{
+ struct pex_msdos *ms;
+ int i;
+
+ ms = (struct pex_msdos *) obj->sysdep;
+ for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
+ if (msdos->files[i] != NULL)
+ free (msdos->files[i]);
+ if (msdos->statuses != NULL)
+ free (msdos->statuses);
+ free (msdos);
+ obj->sysdep = NULL;
}