+const struct pex_funcs funcs =
+{
+ pex_unix_open_read,
+ pex_unix_open_write,
+ pex_unix_exec_child,
+ pex_unix_close,
+ pex_unix_wait,
+ pex_unix_pipe,
+ pex_unix_fdopenr,
+ pex_unix_fdopenw,
+ pex_unix_cleanup
+};
+
+/* Return a newly initialized pex_obj structure. */
+
+struct pex_obj *
+pex_init (int flags, const char *pname, const char *tempbase)
+{
+ return pex_init_common (flags, pname, tempbase, &funcs);
+}
+
+/* Open a file for reading. */
+
+static int
+pex_unix_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
+ int binary ATTRIBUTE_UNUSED)
+{
+ return open (name, O_RDONLY);
+}
+
+/* Open a file for writing. */
+
+static int
+pex_unix_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
+ int binary ATTRIBUTE_UNUSED)
+{
+ /* 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, PUBLIC_MODE);
+}
+
+/* Close a file. */
+
+static int
+pex_unix_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
+{
+ return close (fd);
+}
+
+/* Report an error from a child process. We don't use stdio routines,
+ because we might be here due to a vfork call. */
+
+static void
+pex_child_error (struct pex_obj *obj, const char *executable,
+ const char *errmsg, int err)
+{
+ int retval = 0;
+#define writeerr(s) retval |= (write (STDERR_FILE_NO, s, strlen (s)) < 0)
+ writeerr (obj->pname);
+ writeerr (": error trying to exec '");
+ writeerr (executable);
+ writeerr ("': ");
+ writeerr (errmsg);
+ writeerr (": ");
+ writeerr (xstrerror (err));
+ writeerr ("\n");
+#undef writeerr
+ /* Exit with -2 if the error output failed, too. */
+ _exit (retval == 0 ? -1 : -2);
+}
+
+/* Execute a child. */
+
+extern char **environ;
+
+static pid_t
+pex_unix_exec_child (struct pex_obj *obj, int flags, const char *executable,
+ char * const * argv, char * const * env,
+ int in, int out, int errdes,
+ int toclose, const char **errmsg, int *err)
+{
+ pid_t pid;
+
+ /* We declare these to be volatile to avoid warnings from gcc about
+ them being clobbered by vfork. */
+ volatile int sleep_interval;
+ volatile int retries;
+
+ /* We vfork and then set environ in the child before calling execvp.
+ This clobbers the parent's environ so we need to restore it.
+ It would be nice to use one of the exec* functions that takes an
+ environment as a parameter, but that may have portability issues. */
+ char **save_environ = environ;
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