signal, exec, wait, pid: improvements, especially to exec

- fix popen [open "|pipeline ..."] to return meaningful status in close
  (but note that stderr is not captured)
- popen pipelines can now be used as the target of exec redirection
- overally improvements to exec on windows. Now crt file descriptors
  are used throughout
- add support for [pid], [wait] and popen on windows
- os.wait is now wait, and integrates with [exec ... &] to be able
  to wait for running background tasks
- [socket pipe] is now also [pipe] and is supported on windows
- [file tempfile] is supported on windows
- move duplicated code between jim-aio.c and jim-exec.c to jimiocompat.c
- Fix [exec] on windows to match unix semantics wrt sharing the parent stream
  unless redirected rather than using /dev/null
- On windows redirect to or from /dev/null is automatically converted to NUL:
- If signal support is disabled, implement a minimal Jim_SignalId() for exec and wait
- aio now supports getfd, to return the underlying file descriptor.
  This is used by exec to support redirection, and allows popen channels
  to support exec redirection.

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 80 insertions, 0 deletions

diff --git a/jimiocompat.h b/jimiocompat.h
new file mode 100644
index 0000000..2cbb578
--- /dev/null
+++ b/jimiocompat.h
@@ -0,0 +1,80 @@
+#ifndef JIMIOCOMPAT_H
+#define JIMIOCOMPAT_H
+
+/*
+ * Cross-platform compatibility functions and types for I/O.
+ * Currently used by jim-aio.c and jim-exec.c
+ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include "jimautoconf.h"
+#include <jim.h>
+#include <jim-win32compat.h>
+
+/**
+ * Set an error result based on errno and the given message.
+ */
+void Jim_SetResultErrno(Jim_Interp *interp, const char *msg);
+
+/**
+ * Opens the file for writing (and appending if append is true).
+ * Returns the file descriptor, or -1 on failure.
+ */
+int Jim_OpenForWrite(const char *filename, int append);
+
+/**
+ * Opens the file for reading.
+ * Returns the file descriptor, or -1 on failure.
+ */
+int Jim_OpenForRead(const char *filename);
+
+#if defined(__MINGW32__)
+    #ifndef STRICT
+    #define STRICT
+    #endif
+    #define WIN32_LEAN_AND_MEAN
+    #include <windows.h>
+    #include <fcntl.h>
+    #include <io.h>
+    #include <process.h>
+
+    typedef HANDLE pidtype;
+    #define JIM_BAD_PID INVALID_HANDLE_VALUE
+    /* Note that this isn't a separate value on Windows since we don't have os.fork */
+    #define JIM_NO_PID INVALID_HANDLE_VALUE
+
+    /* These seem to accord with the conventions used by msys/mingw32 */
+    #define WIFEXITED(STATUS) (((STATUS) & 0xff00) == 0)
+    #define WEXITSTATUS(STATUS) ((STATUS) & 0x00ff)
+    #define WIFSIGNALED(STATUS) (((STATUS) & 0xff00) != 0)
+    #define WTERMSIG(STATUS) (((STATUS) >> 8) & 0xff)
+    #define WNOHANG 1
+
+    /**
+     * Unix-compatible errno
+     */
+    int Jim_Errno(void);
+    pidtype waitpid(pidtype pid, int *status, int nohang);
+
+    #define HAVE_PIPE
+    #define pipe(P) _pipe((P), 0, O_NOINHERIT)
+
+#elif defined(HAVE_UNISTD_H)
+    #include <unistd.h>
+    #include <fcntl.h>
+    #include <sys/wait.h>
+    #include <sys/stat.h>
+
+    typedef int pidtype;
+    #define Jim_Errno() errno
+    #define JIM_BAD_PID -1
+    #define JIM_NO_PID 0
+
+    #ifndef HAVE_EXECVPE
+        #define execvpe(ARG0, ARGV, ENV) execvp(ARG0, ARGV)
+    #endif
+#endif
+
+#endif