1 files changed, 124 insertions, 0 deletions
diff --git a/lib/mlib.c b/lib/mlib.c
new file mode 100644
index 000000000..5fee2a406
--- /dev/null
+++ b/lib/mlib.c
@@ -0,0 +1,124 @@
+/*
+ * libdpkg - Debian packaging suite library routines
+ * mlib.c - `must' library: routines will succeed or longjmp
+ *
+ * Copyright (C) 1994,1995 Ian Jackson <iwj10@cus.cam.ac.uk>
+ *
+ * This 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 2,
+ * or (at your option) any later version.
+ *
+ * This 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 dpkg; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+
+#include "config.h"
+#include "dpkg.h"
+
+/* Incremented when we do some kind of generally necessary operation, so that
+ * loops &c know to quit if we take an error exit.  Decremented again afterwards.
+ */
+volatile int onerr_abort= 0;
+
+void *m_malloc(size_t amount) {
+#ifdef MDEBUG
+  unsigned short *r2, x;
+#endif
+  void *r;
+  
+  onerr_abort++;
+  r= malloc(amount);
+  if (!r) ohshite("malloc failed (%ld bytes)",(long)amount);
+  onerr_abort--;
+  
+#ifdef MDEBUG
+  r2= r; x= (unsigned short)amount ^ 0xf000;
+  while (amount >= 2) { *r2++= x; amount -= 2; }
+#endif
+  return r;
+}
+
+void *m_realloc(void *r, size_t amount) {
+  onerr_abort++;
+  r= realloc(r,amount);
+  if (!r) ohshite("realloc failed (%ld bytes)",(long)amount);
+  onerr_abort--;
+
+  return r;
+}
+
+static void print_error_forked(const char *emsg, const char *contextstring) {
+  fprintf(stderr, "%s (subprocess): %s\n", thisname, emsg);
+}
+
+static void cu_m_fork(int argc, void **argv) {
+  exit(2);
+  /* Don't do the other cleanups, because they'll be done by/in the parent
+   * process.
+   */
+}
+
+int m_fork(void) {
+  pid_t r;
+  r= fork();
+  if (r == -1) { onerr_abort++; ohshite("fork failed"); }
+  if (r > 0) return r;
+  push_cleanup(cu_m_fork,~0, 0,0, 0);
+  set_error_display(print_error_forked,0);
+  return r;
+}
+
+void m_dup2(int oldfd, int newfd) {
+  const char *const stdstrings[]= { "in", "out", "err" };
+  
+  if (dup2(oldfd,newfd) == newfd) return;
+
+  onerr_abort++;
+  if (newfd < 3) ohshite("failed to dup for std%s",stdstrings[newfd]);
+  ohshite("failed to dup for fd %d",newfd);
+}
+
+void m_pipe(int *fds) {
+  if (!pipe(fds)) return;
+  onerr_abort++;
+  ohshite("failed to create pipe");
+}
+
+void checksubprocerr(int status, const char *description, int sigpipeok) {
+  int n;
+  if (WIFEXITED(status)) {
+    n= WEXITSTATUS(status); if (!n) return;
+    ohshit("subprocess %s returned error exit status %d",description,n);
+  } else if (WIFSIGNALED(status)) {
+    n= WTERMSIG(status); if (!n || (sigpipeok && n==SIGPIPE)) return;
+    ohshit("subprocess %s killed by signal (%s)%s",
+           description, strsignal(n), WCOREDUMP(status) ? ", core dumped" : "");
+  } else {
+    ohshit("subprocess %s failed with wait status code %d",description,status);
+  }
+}
+
+void waitsubproc(pid_t pid, const char *description, int sigpipeok) {
+  pid_t r;
+  int status;
+
+  while ((r= waitpid(pid,&status,0)) == -1 && errno == EINTR);
+  if (r != pid) { onerr_abort++; ohshite("wait for %s failed",description); }
+  checksubprocerr(status,description,sigpipeok);
+}