[SV 42447]: VMS simulate exporting symbols

This also includes fixing the most of the exit handling code for VMS.

Self tests:
 Previously about 94 Tests in 36 categories fail.
 Now about 45 tests in 22 categories fail.

Because some tests do not properly clean up, the number of tests that
fail can vary by one or two test cases between consecutive runs.

* Makefile.am: Add new VMS files.
* job.c: add prototype for vms_strsignal().
* job.c: (child_error): Remove VMS specific code as no longer needed.
* job.c: (reap_children): The VMS specific code was setting the
status to 0 instead of setting it to the proper exit status.
* job.h: Add vms_launch_status to struct child.
* main.c: (main): Use environment variables for options to use MCR
* instead of a foreign command, and to always use command files for
subprocesses.
For VMS use (set_program_name) routine which is common to ports of
other GNU packages to VMS to set the program name used internally.
Use (vms_putenv_symbol) to set up symbols to be visible in child
programs, including recursive make launched by execve()
Start of Bash shell detection code for VMS.
* makefile.com: Need nested_include=none for building on VMS search
lists.  Add vms_progname, vms_exit, and vms_export_symbol.
* makefile.vms: Need nested_include=none for building on VMS search
lists.  Add vms_progname, vms_exit, vms_export_symbol.
* makeint.h: Make sure non-standard "VMS" macro is defined.  Add
prototypes for new VMS routines.  Remove VMS-specific failure codes.
* vmsjobs.c: Add VMS POSIX exit code constants.
(_is_unixy_shell): Detect Bash shell.
(vms_strsignal): simulate strsignal() on VMS.
(vmsHandleChildTerm): fix to properly report failed LIB$SPAWN() exit
status codes.  Remove code that duplicated code in job.c.
(child_execute_job): Export environment symbols before spawning a
child and restore afterward unless option to use command files for
subprocesses is set.  Improve handling of UNIX null commands ":".
* vms_exit.c: Provides vms_exit() to detect if an exit code is UNIX
or VMS, and converts the UNIX code into a VMS exit code.
* vms_export_symbol.c: Routines to create DCL symbols that work like
shell aliases or exported shell symbols and clean them up on exit.
* vms_export_symbol_test.com: Unit test for vms_export_symbol.c
* vms_progname.c: New file: VMS specific replace for progname.c that
is used in some GNU projects.

1 files changed, 463 insertions, 0 deletions

diff --git a/vms_progname.c b/vms_progname.c
new file mode 100644
index 0000000..199ed32
--- /dev/null
+++ b/vms_progname.c
@@ -0,0 +1,463 @@
+/* File: vms_progname.c
+ *
+ * This module provides a fixup of the program name.
+ *
+ * This module is designed to be a plug in replacement for the
+ * progname module used by many GNU utilities with a few enhancements
+ * needed for GNU Make.
+ *
+ * It does not support the HAVE_DECL_PROGRAM_INVOCATION_* macros at this
+ * time.
+ *
+ * Make sure that the program_name string is set as close as possible to
+ *    what the original command was given.
+ *
+ * When run from DCL, The argv[0] element is initialized with an absolute
+ * path name.  The decc$ feature logical names can control the format
+ * of this pathname.  In some cases it causes the UNIX format name to be
+ * formatted incorrectly.
+ *
+ * This DCL provided name is usually incompatible with what is expected to
+ * be provided by Unix programs and needs to be replaced.
+ *
+ * When run from an exec() call, the argv[0] element is initialized by the
+ * program.  This name is compatible with what is expected to be provided
+ * by Unix programs and should be passed through unchanged.
+ *
+ * The DCL provided name can be detected because it always contains the
+ * device name.
+ *
+ * DCL examples:
+ *    devname:[dir]program.exe;1         Normal VMS - remove path and .EXE;n
+ *    devname:[dir]facility$program.exe;1   Facility also needs removal.
+ *    /devname/dir/program.exe
+ *    /DISK$VOLUME/dir/program.exe.1     Bug version should not be there.
+ *    /DISK$VOLUME/dir/program.          Bug Period should not be there.
+ *
+ */
+
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+
+GNU Make is free software; you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation; either version 3 of the License, or (at your option) any later
+version.
+
+GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+
+/* Per copyright assignment agreement with the Free Software Foundation
+   this software may be available under under other license agreements
+   and copyrights. */
+
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+#include <descrip.h>
+#include <dvidef.h>
+#include <efndef.h>
+#include <fscndef.h>
+#include <stsdef.h>
+
+#ifdef USE_PROGNAME_H
+# include "progname.h"
+#endif
+
+#pragma member_alignment save
+#pragma nomember_alignment longword
+struct item_list_3
+{
+  unsigned short len;
+  unsigned short code;
+  void * bufadr;
+  unsigned short * retlen;
+};
+
+struct filescan_itmlst_2
+{
+  unsigned short length;
+  unsigned short itmcode;
+  char * component;
+};
+
+#pragma member_alignment
+
+int
+SYS$GETDVIW (unsigned long efn,
+             unsigned short chan,
+             const struct dsc$descriptor_s * devnam,
+             const struct item_list_3 * itmlst,
+             void * iosb,
+             void (* astadr)(unsigned long),
+             unsigned long astprm,
+             void * nullarg);
+
+int
+SYS$FILESCAN (const struct dsc$descriptor_s * srcstr,
+              struct filescan_itmlst_2 * valuelist,
+              unsigned long * fldflags,
+              struct dsc$descriptor_s *auxout,
+              unsigned short * retlen);
+
+/* String containing name the program is called with.
+   To be initialized by main().  */
+
+const char *program_name = NULL;
+
+static int internal_need_vms_symbol = 0;
+
+static char vms_new_nam[256];
+
+int
+need_vms_symbol (void)
+{
+  return internal_need_vms_symbol;
+}
+
+
+void
+set_program_name (const char *argv0)
+{
+  int status;
+  int result;
+
+#ifdef DEBUG
+  printf ("original argv0 = %s\n", argv0);
+#endif
+
+  /* Posix requires non-NULL argv[0] */
+  if (argv0 == NULL)
+    {
+      fputs ("A NULL argv[0] was passed through an exec system call.\n",
+             stderr);
+      abort ();
+    }
+
+  program_name = argv0;
+  result = 0;
+  internal_need_vms_symbol = 0;
+
+  /* If the path name starts with a /, then it is an absolute path         */
+  /* that may have been generated by the CRTL instead of the command name  */
+  /* If it is the device name between the slashes, then this was likely    */
+  /* from the run command and needs to be fixed up.                        */
+  /* If the DECC$POSIX_COMPLIANT_PATHNAMES is set to 2, then it is the     */
+  /* DISK$VOLUME that will be present, and it will still need to be fixed. */
+  if (argv0[0] == '/')
+    {
+      char * nextslash;
+      int length;
+      struct item_list_3 itemlist[3];
+      unsigned short dvi_iosb[4];
+      char alldevnam[64];
+      unsigned short alldevnam_len;
+      struct dsc$descriptor_s devname_dsc;
+      char diskvolnam[256];
+      unsigned short diskvolnam_len;
+
+      internal_need_vms_symbol = 1;
+
+       /* Get some information about the disk */
+      /*--------------------------------------*/
+      itemlist[0].len = (sizeof alldevnam) - 1;
+      itemlist[0].code = DVI$_ALLDEVNAM;
+      itemlist[0].bufadr = alldevnam;
+      itemlist[0].retlen = &alldevnam_len;
+      itemlist[1].len = (sizeof diskvolnam) - 1 - 5;
+      itemlist[1].code = DVI$_VOLNAM;
+      itemlist[1].bufadr = &diskvolnam[5];
+      itemlist[1].retlen = &diskvolnam_len;
+      itemlist[2].len = 0;
+      itemlist[2].code = 0;
+
+      /* Add the prefix for the volume name. */
+      /* SYS$GETDVI will append the volume name to this */
+      strcpy (diskvolnam, "DISK$");
+
+      nextslash = strchr (&argv0[1], '/');
+      if (nextslash != NULL)
+        {
+          length = nextslash - argv0 - 1;
+
+          /* Cast needed for HP C compiler diagnostic */
+          devname_dsc.dsc$a_pointer = (char *)&argv0[1];
+          devname_dsc.dsc$w_length = length;
+          devname_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
+          devname_dsc.dsc$b_class = DSC$K_CLASS_S;
+
+          status = SYS$GETDVIW (EFN$C_ENF, 0, &devname_dsc, itemlist,
+                                dvi_iosb, NULL, 0, 0);
+          if (!$VMS_STATUS_SUCCESS (status))
+            {
+              /* If the sys$getdviw fails, then this path was passed by */
+              /* An exec() program and not from DCL, so do nothing */
+              /* An example is "/tmp/program" where tmp: does not exist */
+#ifdef DEBUG
+              printf ("sys$getdviw failed with status %d\n", status);
+#endif
+              result = 0;
+             }
+           else if (!$VMS_STATUS_SUCCESS (dvi_iosb[0]))
+             {
+#ifdef DEBUG
+                printf ("sys$getdviw failed with iosb %d\n", dvi_iosb[0]);
+#endif
+                result = 0;
+              }
+            else
+              {
+                char * devnam;
+                int devnam_len;
+                char argv_dev[64];
+
+                /* Null terminate the returned alldevnam */
+                alldevnam[alldevnam_len] = 0;
+                devnam = alldevnam;
+                devnam_len = alldevnam_len;
+
+                /* Need to skip past any leading underscore */
+                if (devnam[0] == '_')
+                  {
+                    devnam++;
+                    devnam_len--;
+                  }
+
+                /* And remove the trailing colon */
+                if (devnam[devnam_len - 1] == ':')
+                  {
+                    devnam_len--;
+                    devnam[devnam_len] = 0;
+                  }
+
+                /* Null terminate the returned volnam */
+                diskvolnam_len += 5;
+                diskvolnam[diskvolnam_len] = 0;
+
+                /* Check first for normal CRTL behavior */
+                if (devnam_len == length)
+                  {
+                    strncpy (vms_new_nam, &argv0[1], length);
+                    vms_new_nam[length] = 0;
+                    result = (strcasecmp (devnam, vms_new_nam) == 0);
+                  }
+
+                /* If we have not got a match, check for POSIX Compliant */
+                /* behavior.  To be more accurate, we could also check */
+                /* to see if that feature is active. */
+                if ((result == 0) && (diskvolnam_len == length))
+                  {
+                    strncpy (vms_new_nam, &argv0[1], length);
+                    vms_new_nam[length] = 0;
+                    result = (strcasecmp (diskvolnam, vms_new_nam) == 0);
+                  }
+              }
+        }
+      }
+    else
+      {
+        /* The path did not start with a slash, so it could be VMS format */
+        /* If it is vms format, it has a volume/device in it as it must   */
+        /* be an absolute path */
+        struct dsc$descriptor_s path_desc;
+        int status;
+        unsigned long field_flags;
+        struct filescan_itmlst_2 item_list[5];
+        char * volume;
+        char * name;
+        int name_len;
+        char * ext;
+
+        path_desc.dsc$a_pointer = (char *)argv0; /* cast ok */
+        path_desc.dsc$w_length = strlen (argv0);
+        path_desc.dsc$b_dtype = DSC$K_DTYPE_T;
+        path_desc.dsc$b_class = DSC$K_CLASS_S;
+
+        /* Don't actually need to initialize anything buf itmcode */
+        /* I just do not like uninitialized input values */
+
+        /* Sanity check, this must be the same length as input */
+        item_list[0].itmcode = FSCN$_FILESPEC;
+        item_list[0].length = 0;
+        item_list[0].component = NULL;
+
+        /* If the device is present, then it if a VMS spec */
+        item_list[1].itmcode = FSCN$_DEVICE;
+        item_list[1].length = 0;
+        item_list[1].component = NULL;
+
+        /* we need the program name and type */
+        item_list[2].itmcode = FSCN$_NAME;
+        item_list[2].length = 0;
+        item_list[2].component = NULL;
+
+        item_list[3].itmcode = FSCN$_TYPE;
+        item_list[3].length = 0;
+        item_list[3].component = NULL;
+
+        /* End the list */
+        item_list[4].itmcode = 0;
+        item_list[4].length = 0;
+        item_list[4].component = NULL;
+
+        status = SYS$FILESCAN ((const struct dsc$descriptor_s *)&path_desc,
+                               item_list, &field_flags, NULL, NULL);
+
+
+        if ($VMS_STATUS_SUCCESS (status) &&
+           (item_list[0].length == path_desc.dsc$w_length) &&
+           (item_list[1].length != 0))
+          {
+
+            char * dollar;
+            int keep_ext;
+            int i;
+
+            /* We need the filescan to be successful, */
+            /* same length as input, and a volume to be present */
+            internal_need_vms_symbol = 1;
+
+            /* We will assume that we only get to this path on a version */
+            /* of VMS that does not support the EFS character set */
+
+            /* There may be a xxx$ prefix on the image name.  Linux */
+            /* programs do not handle that well, so strip the prefix */
+            name = item_list[2].component;
+            name_len = item_list[2].length;
+            dollar = strrchr (name, '$');
+            if (dollar != NULL)
+              {
+                dollar++;
+                name_len = name_len - (dollar - name);
+                name = dollar;
+              }
+
+            strncpy (vms_new_nam, name, name_len);
+            vms_new_nam[name_len] = 0;
+
+            /* Commit to using the new name */
+            program_name = vms_new_nam;
+
+            /* We only keep the extension if it is not ".exe" */
+            keep_ext = 0;
+            ext = item_list[3].component;
+
+            if (item_list[3].length != 1)
+              {
+                keep_ext = 1;
+                if (item_list[3].length == 4)
+                  {
+                    if ((ext[1] == 'e' || ext[1] == 'E') &&
+                        (ext[2] == 'x' || ext[2] == 'X') &&
+                        (ext[3] == 'e' || ext[3] == 'E'))
+                      keep_ext = 0;
+                  }
+              }
+
+            if (keep_ext == 1)
+              strncpy (&vms_new_nam[name_len], ext, item_list[3].length);
+          }
+      }
+
+    if (result)
+      {
+        char * lastslash;
+        char * dollar;
+        char * dotexe;
+        char * lastdot;
+        char * extension;
+
+        /* This means it is probably the name from a DCL command */
+        /* Find the last slash which separates the file from the */
+        /* path. */
+        lastslash = strrchr (argv0, '/');
+
+        if (lastslash != NULL) {
+            int i;
+
+            lastslash++;
+
+            /* There may be a xxx$ prefix on the image name.  Linux */
+            /* programs do not handle that well, so strip the prefix */
+            dollar = strrchr (lastslash, '$');
+
+            if (dollar != NULL) {
+                dollar++;
+                lastslash = dollar;
+            }
+
+            strcpy (vms_new_nam, lastslash);
+
+            /* In UNIX mode + EFS character set, there should not be a */
+            /* version present, as it is not possible when parsing to  */
+            /* tell if it is a version or part of the UNIX filename as */
+            /* UNIX programs use numeric extensions for many reasons.  */
+
+            lastdot = strrchr (vms_new_nam, '.');
+            if (lastdot != NULL) {
+                int i;
+
+                i = 1;
+                while (isdigit (lastdot[i])) {
+                    i++;
+                }
+                if (lastdot[i] == 0) {
+                    *lastdot = 0;
+                }
+            }
+
+            /* Find the .exe on the name (case insenstive) and toss it */
+            dotexe = strrchr (vms_new_nam, '.');
+            if (dotexe != NULL) {
+                if ((dotexe[1] == 'e' || dotexe[1] == 'E') &&
+                    (dotexe[2] == 'x' || dotexe[2] == 'X') &&
+                    (dotexe[3] == 'e' || dotexe[3] == 'E') &&
+                    (dotexe[4] == 0)) {
+
+                    *dotexe = 0;
+                } else {
+                     /* Also need to handle a null extension because of a */
+                     /* CRTL bug. */
+                     if (dotexe[1] == 0) {
+                         *dotexe = 0;
+                    }
+                }
+            }
+
+            /* Commit to new name */
+            program_name = vms_new_nam;
+
+        } else {
+            /* There is no way that the code should ever get here */
+            /* As we already verified that the '/' was present */
+            fprintf (stderr, "Sanity failure somewhere we lost a '/'\n");
+        }
+    }
+}
+
+#ifdef DEBUG
+
+int
+main (int argc, char ** argv, char **env)
+{
+
+  char command[1024];
+
+  set_program_name (argv[0]);
+
+  printf ("modified argv[0] = %s\n", program_name);
+
+  return 0;
+}
+#endif