(deactivate_process, status_notify, read_process_output)

[gnu-emacs] / src / unexaix.c

diff --git a/src/unexaix.c b/src/unexaix.c
index 2957f966902bb532a25fab3f5bada5ebf061713f..071f09898edda7d87e85dbbca4fb963a25344a7a 100644 (file)
--- a/src/unexaix.c
+++ b/src/unexaix.c
@@ -1,12 +1,12 @@
-/* Dumping and loading data areas, for Emacs under AIX.
-   (It may also work on other kinds of system V.)
-   Copyright (C) 1990 Free Software Foundation, Inc.
+/* Dump an executable image.
+   Copyright (C) 1985, 1986, 1987, 1988, 1999, 2002, 2003, 2004,
+                 2005 Free Software Foundation, Inc.

 
 This file is part of GNU Emacs.
 
 GNU Emacs is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 
 This file is part of GNU Emacs.
 
 GNU Emacs 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 1, or (at your option)
+the Free Software Foundation; either version 2, or (at your option)

 any later version.
 
 GNU Emacs is distributed in the hope that it will be useful,
 any later version.
 
 GNU Emacs is distributed in the hope that it will be useful,


@@ -16,248 +16,667 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with GNU Emacs; see the file COPYING.  If not, write to
 
 You should have received a copy of the GNU General Public License
 along with GNU Emacs; see the file COPYING.  If not, write to

-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.
+
+In other words, you are welcome to use, share and improve this program.
+You are forbidden to forbid anyone else to use, share and improve
+what you give them.   Help stamp out software-hoarding!  */
+
+
+/* Originally based on the COFF unexec.c by Spencer W. Thomas.
+ *
+ * Subsequently hacked on by
+ * Bill Mann <Bill_Man@praxisint.com>
+ * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz>
+ * Mike Sperber <sperber@informatik.uni-tuebingen.de>
+ *
+ * Synopsis:
+ *     unexec (new_name, a_name, data_start, bss_start, entry_address)
+ *     char *new_name, *a_name;
+ *     unsigned data_start, bss_start, entry_address;
+ *
+ * Takes a snapshot of the program and makes an a.out format file in the
+ * file named by the string argument new_name.
+ * If a_name is non-NULL, the symbol table will be taken from the given file.
+ * On some machines, an existing a_name file is required.
+ *
+ * data_start and entry_address are ignored.
+ *
+ * bss_start indicates how much of the data segment is to be saved in the
+ * a.out file and restored when the program is executed.  It gives the lowest
+ * unsaved address, and is rounded up to a page boundary.  The default when 0
+ * is given assumes that the entire data segment is to be stored, including
+ * the previous data and bss as well as any additional storage allocated with
+ * sbrk(2).
+ *
+ */
+
+#ifndef emacs
+#define PERROR(arg) perror (arg); return -1
+#else
+#include <config.h>
+#define PERROR(file) report_error (file, new)
+#endif
+
+#include <a.out.h>
+/* Define getpagesize () if the system does not.
+   Note that this may depend on symbols defined in a.out.h
+ */
+#include "getpagesize.h"

 
 

-/* This is based on a public domain program written by IBM.  */
-
-/*************** SYSTEM DEFINES *********************************/
-
-#include "config.h"
-#include "paths.h"

 #include <sys/types.h>
 #include <sys/types.h>

-#include <sys/files.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>

 #include <fcntl.h>
 #include <fcntl.h>

-#include <sys/mode.h>
-#include <sys/ipc.h>
-#include <sys/shm.h>
-#include <malloc.h>
-#include <stdio.h>                             /* MWW */
+
+extern char *start_of_text (void);             /* Start of text */
+extern char *start_of_data (void);             /* Start of initialized data */
+
+extern int _data;
+extern int _text;
+
+#include <filehdr.h>
+#include <aouthdr.h>
+#include <scnhdr.h>
+#include <syms.h>
+
+static struct filehdr f_hdr;           /* File header */
+static struct aouthdr f_ohdr;          /* Optional file header (a.out) */
+static long bias;                      /* Bias to add for growth */
+static long lnnoptr;                   /* Pointer to line-number info within file */
+
+static long text_scnptr;
+static long data_scnptr;
+#define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1))
+static long load_scnptr;
+static long orig_load_scnptr;
+static long orig_data_scnptr;
+static int unrelocate_symbols (int, int, char *, char *);
+
+#ifndef MAX_SECTIONS
+#define MAX_SECTIONS   10
+#endif
+
+static int adjust_lnnoptrs (int, int, char *);
+
+static int pagemask;
+
+/* Correct an int which is the bit pattern of a pointer to a byte
+   into an int which is the number of a byte.
+   This is a no-op on ordinary machines, but not on all.  */
+
+#ifndef ADDR_CORRECT   /* Let m-*.h files override this definition */
+#define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
+#endif
+
+#ifdef emacs

 #include "lisp.h"
 
 #include "lisp.h"
 

-/*************** LOCAL DEFINES **********************************/
+static void
+report_error (char *file, int fd)
+{
+  if (fd)
+    close (fd);
+  report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
+}
+#endif /* emacs */
+
+#define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
+#define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
+#define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1

 
 

-struct data_header             /* saved data header            */
+static void
+report_error_1 (int fd, char *msg, int a1, int a2)

 {
 {

-  char *start;                 /* dump _data addr              */
-  char *end;                   /* dump _end addr               */
-  char *sbrk1;                 /* dump original sbrk addr      */
-  char *sbrk2;                 /* dump final sbrk addr */
-  int puresize;                        /* size of pure data dumped  */
-};
-
-#define EMACSSHMKEY "EMACSSHMKEY"
-#define EMACS_DATA_FILE "EMACS-DATA"
-#define NEW_SHMGET_FLAGS (IPC_CREAT | S_IWUSR | S_IRUSR \
-      | S_IWGRP | S_IRGRP | S_IWOTH | S_IROTH)
-#define OLD_SHMAT_FLAGS SHM_RDONLY
-#define OLD_SHMGET_FLAGS (S_IRUSR | S_IRGRP | S_IROTH) 
-#define OLD_OPEN_FLAGS O_RDONLY
-#define NEW_OPEN_FLAGS (O_RDWR | O_CREAT | O_TRUNC)
-
-/*************** EXTERNAL / GLOBAL DATA AREA ********************/
-
-extern char _data;             /* start of data addr           */
-extern char _end;              /* end of all data + 1 addr     */
-static char *original_sbrk;    /* sbrk when dump first run     */
-
-void
-map_in_data (use_dumped_data)
-     int use_dumped_data;
+  close (fd);
+#ifdef emacs
+  error (msg, a1, a2);
+#else
+  fprintf (stderr, msg, a1, a2);
+  fprintf (stderr, "\n");
+#endif
+}
+
+static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *);
+static void mark_x (char *);
+static int copy_text_and_data (int);
+static int copy_sym (int, int, char *, char *);
+static void write_segment (int, char *, char *);
+\f
+/* ****************************************************************
+ * unexec
+ *
+ * driving logic.
+ */
+int unexec (char *new_name, char *a_name,
+           unsigned data_start,
+           unsigned bss_start,
+           unsigned entry_address)

 {
 {

-  int bufsize;                 /* malloc buffer size           */
-  struct data_header dh;       /* saved data header            */
-  int fd;                      /* saved data file descriptor   */
-  char *finaladdr;             /* last addr in bucket          */
-  char *ipckey = getenv (EMACSSHMKEY); /* env ipc key string   */
-  int length;                  /* dumped data lengths          */
-  char *newaddr;               /* new malloc buffer addr       */
-  int numblks;                 /* number of remaining mallocs  */
-  int shmid;                   /* shared memory id             */
-  key_t shmkey;                        /* shared memory key            */
-  /* Note that using malloc here may not be safe.  */
-  char name[sizeof (PATH_EXEC) + sizeof (EMACS_DATA_FILE) + 2];
-
-  /* Consume remaining malloc space without increasing         */
-  /* the end of data space                                     */
-  original_sbrk = sbrk (0);
-  for (bufsize = 16; bufsize < getpagesize (); bufsize *= 2)
+  int new = -1, a_out = -1;
+
+  if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
+    {
+      PERROR (a_name);
+    }
+  if ((new = creat (new_name, 0666)) < 0)
+    {
+      PERROR (new_name);
+    }
+  if (make_hdr (new, a_out,
+               data_start, bss_start,
+               entry_address,
+               a_name, new_name) < 0
+      || copy_text_and_data (new) < 0
+      || copy_sym (new, a_out, a_name, new_name) < 0
+      || adjust_lnnoptrs (new, a_out, new_name) < 0
+      || unrelocate_symbols (new, a_out, a_name, new_name) < 0)

     {
     {

-      while ((newaddr = (char *)malloc (bufsize - 8)) < original_sbrk)
-       ;
-      for (numblks = (getpagesize () / bufsize) - 1; numblks > 0; numblks--)
-       malloc (bufsize - 8);
-      finaladdr = sbrk (0);
+      close (new);
+      return -1;

     }
     }

-  original_sbrk = sbrk (0);

 
 

-  /* If we don't want the dumped data, get an unshared segment.  */
-  if (!use_dumped_data)
+  close (new);
+  if (a_out >= 0)
+    close (a_out);
+  mark_x (new_name);
+  return 0;
+}
+
+/* ****************************************************************
+ * make_hdr
+ *
+ * Make the header in the new a.out from the header in core.
+ * Modify the text and data sizes.
+ */
+static int
+make_hdr (int new, int a_out,
+         unsigned data_start, unsigned bss_start,
+         unsigned entry_address,
+         char *a_name, char *new_name)
+{
+  int scns;
+  unsigned int bss_end;
+
+  struct scnhdr section[MAX_SECTIONS];
+  struct scnhdr * f_thdr;              /* Text section header */
+  struct scnhdr * f_dhdr;              /* Data section header */
+  struct scnhdr * f_bhdr;              /* Bss section header */
+  struct scnhdr * f_lhdr;              /* Loader section header */
+  struct scnhdr * f_tchdr;             /* Typechk section header */
+  struct scnhdr * f_dbhdr;             /* Debug section header */
+  struct scnhdr * f_xhdr;              /* Except section header */
+
+  load_scnptr = orig_load_scnptr = lnnoptr = 0;
+  pagemask = getpagesize () - 1;
+
+  /* Adjust text/data boundary. */
+  data_start = (long) start_of_data ();
+  data_start = ADDR_CORRECT (data_start);
+
+  data_start = data_start & ~pagemask; /* (Down) to page boundary. */
+
+  bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
+  bss_end &= ~ pagemask;
+  /* Adjust data/bss boundary. */
+  if (bss_start != 0)

     {
     {

-      shmid = shmget (IPC_PRIVATE, PURESIZE, NEW_SHMGET_FLAGS);
-      if (shmid == -1
-         || shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
+      bss_start = (ADDR_CORRECT (bss_start) + pagemask);
+      /* (Up) to page bdry. */
+      bss_start &= ~ pagemask;
+      if (bss_start > bss_end)

        {
        {

-         fprintf (stderr, "emacs: failure obtaining new unshared memory segment.\n");
-         exit (1);
+         ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
+                 bss_start);

        }
        }

-      return;

     }
     }

+  else
+    bss_start = bss_end;

 
 

-  /* Compute the file name with the dumped data.  */
-  strcpy (name, PATH_EXEC);
-  strcat (name, "/");
-  strcat (name, EMACS_DATA_FILE);
+  if (data_start > bss_start)  /* Can't have negative data size. */
+    {
+      ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
+             data_start, bss_start);
+    }

 
 

-  /* Open the file and make sure the addresses have not changed.  */
-  fd = open (name, OLD_OPEN_FLAGS, 0);
-  if (fd < 0)
+  /* Salvage as much info from the existing file as possible */
+  f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL;
+  f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL;
+  if (a_out >= 0)

     {
     {

-      fprintf (stderr, "emacs: failure opening `%s'\n", name);
-      exit (1);
+      if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
+       {
+         PERROR (a_name);
+       }
+      if (f_hdr.f_opthdr > 0)
+       {
+         if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
+           {
+             PERROR (a_name);
+           }
+       }
+      if (f_hdr.f_nscns > MAX_SECTIONS)
+       {
+         ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS");
+       }
+      /* Loop through section headers */
+      for (scns = 0; scns < f_hdr.f_nscns; scns++) {
+       struct scnhdr *s = &section[scns];
+       if (read (a_out, s, sizeof (*s)) != sizeof (*s))
+         {
+           PERROR (a_name);
+         }
+
+#define CHECK_SCNHDR(ptr, name, flags) \
+  if (strcmp(s->s_name, name) == 0) { \
+    if (s->s_flags != flags) { \
+      fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \
+             (unsigned long)s->s_flags, flags, name); \
+    } \
+    if (ptr) { \
+      fprintf(stderr, "unexec: duplicate section header for section %s.\n", \
+             name); \
+    } \
+    ptr = s; \
+  }
+       CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT);
+       CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA);
+       CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS);
+       CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER);
+       CHECK_SCNHDR(f_dbhdr, _DEBUG,  STYP_DEBUG);
+       CHECK_SCNHDR(f_tchdr, _TYPCHK,  STYP_TYPCHK);
+       CHECK_SCNHDR(f_xhdr, _EXCEPT,  STYP_EXCEPT);
+      }
+
+      if (f_thdr == 0)
+       {
+         ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT);
+       }
+      if (f_dhdr == 0)
+       {
+         ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA);
+       }
+      if (f_bhdr == 0)
+       {
+         ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS);
+       }

     }
     }

-  if (read (fd, (char *)&dh, sizeof (dh)) != sizeof (dh)
-      || dh.start != &_data
-      || dh.end != &_end
-      || dh.sbrk1 != original_sbrk
-      || dh.puresize != PURESIZE)
+  else

     {
     {

-      fprintf (stderr, "emacs: header mismatch in `%s'\n", name);
-      exit (1);
+      ERROR0 ("can't build a COFF file from scratch yet");

     }
     }

+  orig_data_scnptr = f_dhdr->s_scnptr;
+  orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
+
+  /* Now we alter the contents of all the f_*hdr variables
+     to correspond to what we want to dump.  */
+
+  /* Indicate that the reloc information is no longer valid for ld (bind);
+     we only update it enough to fake out the exec-time loader.  */
+  f_hdr.f_flags |= (F_RELFLG | F_EXEC);
+
+  f_ohdr.dsize = bss_start - f_ohdr.data_start;
+  f_ohdr.bsize = bss_end - bss_start;
+
+  f_dhdr->s_size = f_ohdr.dsize;
+  f_bhdr->s_size = f_ohdr.bsize;
+  f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize;
+  f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
+
+  /* fix scnptr's */
+  {
+    ulong ptr = section[0].s_scnptr;
+
+    bias = -1;
+    for (scns = 0; scns < f_hdr.f_nscns; scns++)
+      {
+       struct scnhdr *s = &section[scns];
+
+       if (s->s_flags & STYP_PAD)        /* .pad sections omitted in AIX 4.1 */
+         {
+           /*
+            * the text_start should probably be o_algntext but that doesn't
+            * seem to change
+            */
+           if (f_ohdr.text_start != 0) /* && scns != 0 */
+             {
+               s->s_size = 512 - (ptr % 512);
+               if (s->s_size == 512)
+                 s->s_size = 0;
+             }
+           s->s_scnptr = ptr;
+         }
+       else if (s->s_flags & STYP_DATA)
+         s->s_scnptr = ptr;
+       else if (!(s->s_flags & (STYP_TEXT | STYP_BSS)))
+         {
+           if (bias == -1)                /* if first section after bss */
+             bias = ptr - s->s_scnptr;
+
+           s->s_scnptr += bias;
+           ptr = s->s_scnptr;
+         }
+
+       ptr = ptr + s->s_size;
+      }
+  }
+
+  /* fix other pointers */
+  for (scns = 0; scns < f_hdr.f_nscns; scns++)
+    {
+      struct scnhdr *s = &section[scns];

 
 

-  /* Load in the unshared contents.  */
-  if (!(length = dh.end - dh.start)
-      || read (fd, (char *)&_data, length) != length
-      || !(length = dh.sbrk2 - dh.sbrk1)
-      || brk (dh.sbrk2) == -1
-      || read (fd, dh.sbrk1, length) != length)
+      if (s->s_relptr != 0)
+       {
+         s->s_relptr += bias;
+       }
+      if (s->s_lnnoptr != 0)
+       {
+         if (lnnoptr == 0) lnnoptr = s->s_lnnoptr;
+         s->s_lnnoptr += bias;
+       }
+    }
+
+  if (f_hdr.f_symptr > 0L)

     {
     {

-      fprintf (stderr, "emacs: failure loading unshared data.\n");
-      exit (1);
+      f_hdr.f_symptr += bias;

     }
 
     }
 

-  /* Determine ipc key from environment or default             */
-  if (ipckey && *ipckey)
-    shmkey = atoi (ipckey);
-  else
-    shmkey = SHMKEY;
+  text_scnptr = f_thdr->s_scnptr;
+  data_scnptr = f_dhdr->s_scnptr;
+  load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;

 
 

-  /* Attach to "pure data" shared memory segment               */
-  if ((shmid = shmget (shmkey, 0, 0)) == -1
-      || (newaddr = shmat (shmid, (char *)PURE_SEG_BITS, OLD_SHMAT_FLAGS)) == -1)
+  if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))

     {
     {

-      /* We were unable to open an existing segment.  Make a new one.  */
-      struct shmid_ds buf;
-
-      /* First get rid of the one we tried to get.  */
-      shmdt ((char *)PURE_SEG_BITS);
-      shmctl (shmid, IPC_RMID, 0);
+      PERROR (new_name);
+    }

 
 

-      /* If we could not write the data file,
-        don't make a shared segment that we could write.
-        Make an unshared segment instead.  */
-      if (access (name, W_OK) == 0)
+  if (f_hdr.f_opthdr > 0)
+    {
+      if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))

        {
        {

-         shmid = shmget (IPC_PRIVATE, PURESIZE, NEW_SHMGET_FLAGS);
-         if (shmid == -1
-             || shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
-           {
-             fprintf (stderr, "emacs: failure obtaining new unshared memory segment.\n");
-             exit (1);
-           }
+         PERROR (new_name);
+       }
+    }

 
 

-         /* Load the proper data into it.  */
-         if (read (fd, PURE_SEG_BITS, PURESIZE) != PURESIZE)
-           {
-             fprintf (stderr, "emacs: failure loading shared memory data.\n");
-             shmdt ((char *)PURE_SEG_BITS);
-             shmctl (shmid, IPC_RMID, 0);
-             exit (1);
-           }
+  for (scns = 0; scns < f_hdr.f_nscns; scns++) {
+    struct scnhdr *s = &section[scns];
+    if (write (new, s, sizeof (*s)) != sizeof (*s))
+      {
+       PERROR (new_name);
+      }
+  }

 
 

-         close (fd);
-         return;
-       }
+  return (0);
+}
+\f
+/* ****************************************************************
+
+ *
+ * Copy the text and data segments from memory to the new a.out
+ */
+static int
+copy_text_and_data (int new)
+{
+  char *end;
+  char *ptr;
+
+  lseek (new, (long) text_scnptr, SEEK_SET);
+  ptr = start_of_text () + text_scnptr;
+  end = ptr + f_ohdr.tsize;
+  write_segment (new, ptr, end);
+
+  lseek (new, (long) data_scnptr, SEEK_SET);
+  ptr = (char *) f_ohdr.data_start;
+  end = ptr + f_ohdr.dsize;
+  write_segment (new, ptr, end);
+
+  return 0;
+}
+
+#define UnexBlockSz (1<<12)                    /* read/write block size */
+static void
+write_segment (int new, char *ptr, char *end)
+{
+  int i, nwrite, ret;
+  char buf[80];
+  extern int errno;
+  char zeros[UnexBlockSz];

 
 

-      /* Allocate the new shared segment and arrange to write it.  */
-      if ((shmid = shmget (shmkey, PURESIZE, NEW_SHMGET_FLAGS)) == -1
-         || shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
+  for (i = 0; ptr < end;)
+    {
+      /* distance to next block.  */
+      nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr;
+      /* But not beyond specified end.  */
+      if (nwrite > end - ptr) nwrite = end - ptr;
+      ret = write (new, ptr, nwrite);
+      /* If write gets a page fault, it means we reached
+        a gap between the old text segment and the old data segment.
+        This gap has probably been remapped into part of the text segment.
+        So write zeros for it.  */
+      if (ret == -1 && errno == EFAULT)

        {
        {

-         fprintf (stderr, "emacs: failure obtaining new shared memory segment.\n");
-         shmdt ((char *)PURE_SEG_BITS);
-         shmctl (shmid, IPC_RMID, 0);
-         exit (1);
+         memset (zeros, 0, nwrite);
+         write (new, zeros, nwrite);

        }
        }

-
-      /* Load the proper data into it.  */
-      if (read (fd, PURE_SEG_BITS, PURESIZE) != PURESIZE)
+      else if (nwrite != ret)

        {
        {

-         fprintf (stderr, "emacs: failure loading shared memory data.\n");
-         shmdt ((char *)PURE_SEG_BITS);
-         shmctl (shmid, IPC_RMID, 0);
-         exit (1);
+         sprintf (buf,
+                  "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
+                  (unsigned long)ptr, new, nwrite, ret, errno);
+         PERROR (buf);

        }
        }

+      i += nwrite;
+      ptr += nwrite;
+    }
+}
+\f
+/* ****************************************************************
+ * copy_sym
+ *
+ * Copy the relocation information and symbol table from the a.out to the new
+ */
+static int
+copy_sym (int new, int a_out, char *a_name, char *new_name)
+{
+  char page[UnexBlockSz];
+  int n;
+
+  if (a_out < 0)
+    return 0;

 
 

-      /* Detach from the segment and bring it back readonly.  */
-      shmdt ((char *)PURE_SEG_BITS);
+  if (orig_load_scnptr == 0L)
+    return 0;

 
 

-      shmctl (shmid, IPC_STAT, &buf);
-      buf.shm_perm.mode = OLD_SHMGET_FLAGS;
-      shmctl (shmid, IPC_SET, &buf);
+  if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info  */
+    lseek (a_out, lnnoptr, SEEK_SET);  /* start copying from there */
+  else
+    lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */

 
 

-      newaddr = shmat (shmid, (char *)PURE_SEG_BITS, OLD_SHMAT_FLAGS);
-      if (newaddr == -1)
+  while ((n = read (a_out, page, sizeof page)) > 0)
+    {
+      if (write (new, page, n) != n)

        {
        {

-         fprintf (stderr, "emacs: failure reattaching shared memory segment.\n");
-         shmctl (shmid, IPC_RMID, 0);
-         exit (1);
+         PERROR (new_name);

        }
     }
        }
     }

+  if (n < 0)
+    {
+      PERROR (a_name);
+    }
+  return 0;
+}
+\f
+/* ****************************************************************
+ * mark_x
+ *
+ * After successfully building the new a.out, mark it executable
+ */
+static void
+mark_x (char *name)
+{
+  struct stat sbuf;
+  int um;
+  int new = 0;  /* for PERROR */

 
 

-  close (fd);
+  um = umask (777);
+  umask (um);
+  if (stat (name, &sbuf) == -1)
+    {
+      PERROR (name);
+    }
+  sbuf.st_mode |= 0111 & ~um;
+  if (chmod (name, sbuf.st_mode) == -1)
+    PERROR (name);

 }
 }

+\f
+static int
+adjust_lnnoptrs (int writedesc, int readdesc, char *new_name)
+{
+  int nsyms;
+  int naux;
+  int new;
+  struct syment symentry;
+  union auxent auxentry;

 
 

-/* Dump the appropriate parts of memory into a file named NEW
-   from which the shared segment can be initialized.  */
+  if (!lnnoptr || !f_hdr.f_symptr)
+    return 0;

 
 

-void
-map_out_data (new)
-     char *new;
+  if ((new = open (new_name, O_RDWR)) < 0)
+    {
+      PERROR (new_name);
+      return -1;
+    }
+
+  lseek (new, f_hdr.f_symptr, SEEK_SET);
+  for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
+    {
+      read (new, &symentry, SYMESZ);
+      if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL)
+       {
+         symentry.n_value += bias;
+         lseek (new, -SYMESZ, SEEK_CUR);
+         write (new, &symentry, SYMESZ);
+       }
+
+      for (naux = symentry.n_numaux; naux-- != 0; )
+       {
+         read (new, &auxentry, AUXESZ);
+         nsyms++;
+         if (naux != 0              /* skip csect auxentry (last entry) */
+              && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT))
+            {
+              auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
+              lseek (new, -AUXESZ, SEEK_CUR);
+              write (new, &auxentry, AUXESZ);
+            }
+       }
+    }
+  close (new);
+
+  return 0;
+}
+
+static int
+unrelocate_symbols (int new, int a_out, char *a_name, char *new_name)

 {
 {

-  struct data_header dh;       /* saved data header                    */
-  int fd;                      /* saved data file descriptor           */
-  int length;                  /* dumped data length; */
-
-                                  
-  /* Create "saved data" file header */
-  dh.start = &_data;
-  dh.end = &_end;
-  dh.sbrk1 = original_sbrk;
-  dh.sbrk2 = sbrk (0);
-  dh.puresize = PURESIZE;
-
-  /* Create new "saved data" dump file                         */
-  unlink (new);
-  fd = open (new, NEW_OPEN_FLAGS, 0666);
-  if (fd < 0)
-    report_file_error ("Opening dump file", Fcons (build_string (new), Qnil));
-
-  /* Write saved header and data                               */
-  length = sizeof (dh);
-  if (write (fd, (char *)&dh, length) != length)
-    report_file_error ("Writing dump file header",
-                      Fcons (build_string (new), Qnil));
-  length = dh.end - dh.start;
-  if (write (fd, dh.start, length) != length)
-    report_file_error ("Writing low core in dump file",
-                      Fcons (build_string (new), Qnil));
-  length = dh.sbrk2 - dh.sbrk1;
-  if (write (fd, dh.sbrk1, length) != length)
-    report_file_error ("Writing heap in dump file",
-                      Fcons (build_string (new), Qnil));
-  length = PURESIZE;
-  if (write (fd, PURE_SEG_BITS, length) != length)
-    report_file_error ("Writing pure data in dump file",
-                      Fcons (build_string (new), Qnil));
-  close (fd);
+  int i;
+  LDHDR ldhdr;
+  LDREL ldrel;
+  ulong t_reloc = (ulong) &_text - f_ohdr.text_start;
+#ifndef ALIGN_DATA_RELOC
+  ulong d_reloc = (ulong) &_data - f_ohdr.data_start;
+#else
+  /* This worked (and was needed) before AIX 4.2.
+     I have no idea why. -- Mike */
+  ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2);
+#endif
+  int * p;
+
+  if (load_scnptr == 0)
+    return 0;
+
+  lseek (a_out, orig_load_scnptr, SEEK_SET);
+  if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr))
+    {
+      PERROR (new_name);
+    }
+
+#define SYMNDX_TEXT    0
+#define SYMNDX_DATA    1
+#define SYMNDX_BSS     2
+
+  for (i = 0; i < ldhdr.l_nreloc; i++)
+    {
+      lseek (a_out,
+            orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
+            SEEK_SET);
+
+      if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ)
+       {
+         PERROR (a_name);
+       }
+
+      /* move the BSS loader symbols to the DATA segment */
+      if (ldrel.l_symndx == SYMNDX_BSS)
+       {
+         ldrel.l_symndx = SYMNDX_DATA;
+
+         lseek (new,
+                load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
+                SEEK_SET);
+
+         if (write (new, &ldrel, LDRELSZ) != LDRELSZ)
+           {
+             PERROR (new_name);
+           }
+       }
+
+      if (ldrel.l_rsecnm == f_ohdr.o_sndata)
+       {
+         int orig_int;
+
+         lseek (a_out,
+                 orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
+                SEEK_SET);
+
+         if (read (a_out, (void *) &orig_int, sizeof (orig_int))
+             != sizeof (orig_int))
+           {
+             PERROR (a_name);
+           }
+
+          p = (int *) (ldrel.l_vaddr + d_reloc);
+
+         switch (ldrel.l_symndx) {
+         case SYMNDX_TEXT:
+           orig_int = * p - t_reloc;
+           break;
+
+         case SYMNDX_DATA:
+         case SYMNDX_BSS:
+           orig_int = * p - d_reloc;
+           break;
+         }
+
+          if (orig_int != * p)
+            {
+              lseek (new,
+                     data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
+                    SEEK_SET);
+              if (write (new, (void *) &orig_int, sizeof (orig_int))
+                  != sizeof (orig_int))
+                {
+                  PERROR (new_name);
+                }
+            }
+       }
+    }
+  return 0;

 }
 }

+
+/* arch-tag: 0783857a-7c2d-456f-a426-58b722d69fd0
+   (do not change this comment) */