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-rw-r--r--libiberty/pex-djgpp.c284
1 files changed, 232 insertions, 52 deletions
diff --git a/libiberty/pex-djgpp.c b/libiberty/pex-djgpp.c
index 968e7841215..c15f576f79a 100644
--- a/libiberty/pex-djgpp.c
+++ b/libiberty/pex-djgpp.c
@@ -1,6 +1,6 @@
/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it. DJGPP 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.
@@ -38,66 +38,246 @@ extern int errno;
#define PWAIT_ERROR EINVAL
#endif
-/* 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. */
-
-/* For communicating information from pexecute to pwait. */
-static int last_pid = 0;
-static int last_status = 0;
-static int last_reaped = 0;
-
-int
-pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
- const char *program;
- char * const *argv;
- const char *this_pname;
- const char *temp_base;
- char **errmsg_fmt, **errmsg_arg;
- int flags;
+static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
+static int pex_djgpp_open_write (struct pex_obj *, const char *, int);
+static long pex_djgpp_exec_child (struct pex_obj *, int, const char *,
+ char * const *, int, int, int,
+ const char **, int *);
+static int pex_djgpp_close (struct pex_obj *, int);
+static int pex_djgpp_wait (struct pex_obj *, long, int *, struct pex_time *,
+ int, const char **, int *);
+
+/* The list of functions we pass to the common routines. */
+
+const struct pex_funcs funcs =
{
- int rc;
+ pex_djgpp_open_read,
+ pex_djgpp_open_write,
+ pex_djgpp_exec_child,
+ pex_djgpp_close,
+ pex_djgpp_wait,
+ NULL, /* pipe */
+ NULL, /* fdopenr */
+ NULL /* cleanup */
+};
- last_pid++;
- if (last_pid < 0)
- last_pid = 1;
+/* Return a newly initialized pex_obj structure. */
- if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
- abort ();
+struct pex_obj *
+pex_init (int flags, const char *pname, const char *tempbase)
+{
+ /* DJGPP does not support pipes. */
+ flags &= ~ PEX_USE_PIPES;
+ return pex_init_common (flags, pname, tempbase, funcs);
+}
- /* ??? What are the possible return values from spawnv? */
- rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (P_WAIT, program, argv);
+/* Open a file for reading. */
- if (rc == -1)
- {
- *errmsg_fmt = install_error_msg;
- *errmsg_arg = (char *)program;
- return -1;
- }
+static int
+pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
+ const char *name, int binary)
+{
+ return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
+}
+
+/* Open a file for writing. */
- /* Tuck the status away for pwait, and return a "pid". */
- last_status = rc << 8;
- return last_pid;
+static int
+pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
+ const char *name, int binary)
+{
+ /* Note that we can't use O_EXCL here because gcc may have already
+ created the temporary file via make_temp_file. */
+ return open (name,
+ (O_WRONLY | O_CREAT | O_TRUNC
+ | (binary ? O_BINARY : O_TEXT)),
+ S_IRUSR | S_IWUSR);
}
-int
-pwait (pid, status, flags)
- int pid;
- int *status;
- int flags;
+/* Close a file. */
+
+static int
+pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
{
- /* On MSDOS each pexecute must be followed by its associated pwait. */
- if (pid != last_pid
- /* Called twice for the same child? */
- || pid == last_reaped)
+ return close (fd);
+}
+
+/* Execute a child. */
+
+static long
+pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
+ char * const * argv, int in, int out, int errdes,
+ const char **errmsg, int *err)
+{
+ int org_in, org_out, org_errdes;
+ int status;
+ int *statuses;
+
+ org_in = -1;
+ org_out = -1;
+ org_errdes = -1;
+
+ if (in != STDIN_FILE_NO)
+ {
+ org_in = _dup (STDIN_FILE_NO);
+ if (org_in < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup";
+ return -1;
+ }
+ if (_dup2 (in, STDIN_FILE_NO) < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup2";
+ return -1;
+ }
+ if (_close (in) < 0)
+ {
+ *err = errno;
+ *errmsg = "_close";
+ return -1;
+ }
+ }
+
+ if (out != STDOUT_FILE_NO)
+ {
+ org_out = _dup (STDOUT_FILE_NO);
+ if (org_out < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup";
+ return -1;
+ }
+ if (_dup2 (out, STDOUT_FILE_NO) < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup2";
+ return -1;
+ }
+ if (_close (out) < 0)
+ {
+ *err = errno;
+ *errmsg = "_close";
+ return -1;
+ }
+ }
+
+ if (errdes != STDERR_FILE_NO
+ || (flags & PEX_STDERR_TO_STDOUT) != 0)
{
- errno = PWAIT_ERROR;
- return -1;
+ int e;
+
+ org_errdes = _dup (STDERR_FILE_NO);
+ if (org_errdes < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup";
+ return -1;
+ }
+ if (_dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
+ STDERR_FILE_NO) < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup2";
+ return -1;
+ }
+ if (errdes != STDERR_FILE_NO)
+ {
+ if (_close (errdes) < 0)
+ {
+ *err = errno;
+ *errmsg = "_close";
+ return -1;
+ }
+ }
+ }
+
+ status = (((flags & PEX_SEARCH) != 0 ? _spawnvp : _spawnv)
+ (P_WAIT, program, (const char **) argv));
+
+ if (status == -1)
+ {
+ *err = errno;
+ *errmsg = ((flags & PEX_SEARCH) != 0) ? "_spawnvp" : "_spawnv";
+ }
+
+ if (in != STDIN_FILE_NO)
+ {
+ if (_dup2 (org_in, STDIN_FILE_NO) < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup2";
+ return -1;
+ }
+ if (_close (org_in) < 0)
+ {
+ *err = errno;
+ *errmsg = "_close";
+ return -1;
+ }
+ }
+
+ if (out != STDOUT_FILE_NO)
+ {
+ if (_dup2 (org_out, STDOUT_FILE_NO) < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup2";
+ return -1;
+ }
+ if (_close (org_out) < 0)
+ {
+ *err = errno;
+ *errmsg = "_close";
+ return -1;
+ }
}
- /* ??? Here's an opportunity to canonicalize the values in STATUS.
- Needed? */
- *status = (last_status >> 8);
- last_reaped = last_pid;
- return last_pid;
+
+ if (errdes != STDERR_FILE_NO
+ || (flags & PEX_STDERR_TO_STDOUT) != 0)
+ {
+ if (_dup2 (org_errdes, STDERR_FILE_NO) < 0)
+ {
+ *err = errno;
+ *errmsg = "_dup2";
+ return -1;
+ }
+ if (_close (org_errdes) < 0)
+ {
+ *err = errno;
+ *errmsg = "_close";
+ return -1;
+ }
+ }
+
+ /* Save the exit status for later. When we are called, obj->count
+ is the number of children which have executed before this
+ one. */
+ statuses = (int *) obj->sysdep;
+ statuses = xrealloc (statuses, (obj->count + 1) * sizeof (int));
+ statuses[obj->count] = status;
+ obj->sysdep = (void *) statuses;
+
+ return obj->count;
+}
+
+/* Wait for a child process to complete. Actually the child process
+ has already completed, and we just need to return the exit
+ status. */
+
+static int
+pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
+ struct pex_time *time, int done, const char **errmsg,
+ int *err)
+{
+ int *statuses;
+
+ if (time != NULL)
+ memset (time, 0, sizeof *time);
+
+ statuses = (int *) obj->sysdep;
+ *status = statuses[pid];
+
+ return 0;
}
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