Adding upstream version 4.8.0.upstream/4.8.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 776 insertions, 0 deletions

diff --git a/fileio.c b/fileio.c
new file mode 100644
index 0000000..3d9da04
--- /dev/null
+++ b/fileio.c
@@ -0,0 +1,776 @@
+/* Copyright (c) 2008, 2009
+ *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ *      Micah Cowan (micah@cowan.name)
+ *      Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
+ * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
+ *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Copyright (c) 1987 Oliver Laumann
+ *
+ * This program 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, or (at your option)
+ * any later version.
+ *
+ * This program 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 (see the file COPYING); if not, see
+ * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+ *
+ ****************************************************************
+ */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <pwd.h>
+
+#ifndef SIGINT
+# include <signal.h>
+#endif
+
+#include "config.h" 
+#include "screen.h"
+#include "extern.h"
+
+extern struct display *display, *displays;
+extern struct win *fore;
+extern struct layer *flayer;
+extern int ServerSocket;
+extern int real_uid, eff_uid;
+extern int real_gid, eff_gid;
+extern char *extra_incap, *extra_outcap;
+extern char *home, *RcFileName;
+extern char SockPath[], *SockName;
+#ifdef COPY_PASTE
+extern char *BufferFile;
+#endif
+extern int hardcopy_append;
+extern char *hardcopydir;
+
+static char *CatExtra __P((char *, char *));
+static char *findrcfile __P((char *));
+
+
+char *rc_name = "";
+int rc_recursion = 0;
+
+static char * CatExtra(register char *str1, register char *str2) {
+  register char *cp;
+  register int len1, len2, add_colon;
+
+  len1 = strlen(str1);
+  if (len1 == 0)
+    return str2;
+  add_colon = (str1[len1 - 1] != ':');
+  if (str2) {
+    len2 = strlen(str2);
+    if ((cp = realloc(str2, (unsigned) len1 + len2 + add_colon + 1)) == NULL)
+      Panic(0, "%s", strnomem);
+    bcopy(cp, cp + len1 + add_colon, len2 + 1);
+  }
+  else {
+    if ((cp = malloc((unsigned) len1 + add_colon + 1)) == NULL)
+      Panic(0, "%s", strnomem);
+    cp[len1 + add_colon] = '\0';
+  }
+  bcopy(str1, cp, len1);
+  if (add_colon)
+    cp[len1] = ':';
+  return cp;
+}
+
+static char *findrcfile(char *rcfile) {
+  char buf[256];
+  char *p;
+
+  /* Tilde prefix support courtesy <hesso@pool.math.tu-berlin.de>,
+   * taken from a Debian patch. */
+  if (rcfile && *rcfile == '~') {
+    static char rcfilename_tilde_exp[MAXPATHLEN+1];
+    char *slash_position = strchr(rcfile, '/');
+
+    if (slash_position == rcfile+1) {
+      char *home = getenv("HOME");
+      if (!home) {
+        Msg(0, "%s: source: tilde expansion failed", rc_name);
+        return NULL;
+      }
+      snprintf(rcfilename_tilde_exp, MAXPATHLEN, "%s/%s", home, rcfile+2);
+    }
+    else if (slash_position) {
+      struct passwd *p;
+      *slash_position = 0;
+      p = getpwnam(rcfile+1);
+      if (!p){
+        Msg(0, "%s: source: tilde expansion failed for user %s", rc_name, rcfile+1);
+        return NULL;
+      }
+      snprintf(rcfilename_tilde_exp, MAXPATHLEN, "%s/%s", p->pw_dir, slash_position+1);
+    }
+    else {
+      Msg(0, "%s: source: illegal tilde expression.", rc_name);
+      return NULL;
+    }
+    rcfile = rcfilename_tilde_exp;
+  }
+
+  if (rcfile) {
+    char *rcend = rindex(rc_name, '/');
+    if (*rcfile != '/' && rcend && (rcend - rc_name) + strlen(rcfile) + 2 < sizeof(buf)) {
+      strncpy(buf, rc_name, rcend - rc_name + 1);
+      strcpy(buf + (rcend - rc_name) + 1, rcfile);
+      if (access(buf, R_OK) == 0)
+        return SaveStr(buf);
+    }
+    debug1("findrcfile: you specified '%s'\n", rcfile);
+    return SaveStr(rcfile);
+  }
+
+  debug("findrcfile: you specified nothing...\n");
+  if ((p = getenv("SCREENRC")) != NULL && *p != '\0') {
+    debug1("  $SCREENRC has: '%s'\n", p);
+    return SaveStr(p);
+  }
+  else {
+    debug("  ...nothing in $SCREENRC, defaulting $HOME/.screenrc\n");
+    if (strlen(home) > sizeof(buf) - 12)
+      Panic(0, "Rc: home too large");
+    sprintf(buf, "%s/.screenrc", home);
+    return SaveStr(buf);
+  }
+}
+
+/*
+ * this will be called twice:
+ * 1) rcfilename = "/etc/screenrc"
+ * 2) rcfilename = RcFileName
+ */
+int StartRc(char *rcfilename, int nopanic) {
+  register int argc, len;
+  register char *p, *cp;
+  char buf[2048];
+  char *args[MAXARGS];
+  int argl[MAXARGS];
+  FILE *fp;
+  char *oldrc_name = rc_name;
+
+  /* always fix termcap/info capabilities */
+  extra_incap = CatExtra("TF", extra_incap);
+
+  /* Special settings for vt100 and others */
+  if (display && (!strncmp(D_termname, "vt", 2) || !strncmp(D_termname, "xterm", 5)))
+    extra_incap = CatExtra("xn:f0=\033Op:f1=\033Oq:f2=\033Or:f3=\033Os:f4=\033Ot:f5=\033Ou:f6=\033Ov:f7=\033Ow:f8=\033Ox:f9=\033Oy:f.=\033On:f,=\033Ol:fe=\033OM:f+=\033Ok:f-=\033Om:f*=\033Oj:f/=\033Oo:fq=\033OX", extra_incap);
+
+  rc_name = findrcfile(rcfilename);
+  if (rc_name == NULL || (fp = secfopen(rc_name, "r")) == NULL) {
+    const char *rc_nonnull = rc_name ? rc_name : rcfilename;
+    if (!rc_recursion && RcFileName && !strcmp(RcFileName, rc_nonnull)) {
+      /*
+       * User explicitly gave us that name,
+       * this is the only case, where we get angry, if we can't read
+       * the file.
+       */
+      debug3("StartRc: '%s','%s', '%s'\n", RcFileName, rc_name ? rc_name : "(null)", rcfilename);
+      if (!nopanic) Panic(0, "Unable to open \"%s\".", rc_nonnull);
+      /* possibly NOTREACHED */
+    }
+
+    debug1("StartRc: '%s' no good. ignored\n", rc_nonnull);
+    if (rc_name)
+      Free(rc_name);
+    rc_name = oldrc_name;
+    return 1;
+  }
+  while (fgets(buf, sizeof buf, fp) != NULL) {
+    if ((p = rindex(buf, '\n')) != NULL)
+      *p = '\0';
+
+    if ((argc = Parse(buf, sizeof buf, args, argl)) == 0)
+      continue;
+
+    if (strcmp(args[0], "echo") == 0) {
+      if (!display)
+        continue;
+      if (argc < 2 || (argc == 3 && strcmp(args[1], "-n")) || argc > 3) {
+        Msg(0, "%s: 'echo [-n] \"string\"' expected.", rc_name);
+        continue;
+      }
+      AddStr(args[argc - 1]);
+      if (argc != 3) {
+        AddStr("\r\n");
+        Flush(0);
+      }
+    }
+
+    else if (strcmp(args[0], "sleep") == 0) {
+      if (!display)
+        continue;
+      debug("sleeeeeeep\n");
+      if (argc != 2) {
+        Msg(0, "%s: sleep: one numeric argument expected.", rc_name);
+        continue;
+      }
+      DisplaySleep1000(1000 * atoi(args[1]), 1);
+    }
+#ifdef TERMINFO
+    else if (!strcmp(args[0], "termcapinfo") || !strcmp(args[0], "terminfo")) {
+#else
+    else if (!strcmp(args[0], "termcapinfo") || !strcmp(args[0], "termcap")) {
+#endif
+      if (!display)
+        continue;
+      if (argc < 3 || argc > 4) {
+        Msg(0, "%s: %s: incorrect number of arguments.", rc_name, args[0]);
+        continue;
+      }
+
+      for (p = args[1]; p && *p; p = cp) {
+        if ((cp = index(p, '|')) != 0)
+          *cp++ = '\0';
+        len = strlen(p);
+        if (p[len - 1] == '*') {
+          if (!(len - 1) || !strncmp(p, D_termname, len - 1))
+            break;
+        }
+        else if (!strcmp(p, D_termname))
+          break;
+      }
+      if (!(p && *p))
+        continue;
+      extra_incap = CatExtra(args[2], extra_incap);
+      if (argc == 4)
+        extra_outcap = CatExtra(args[3], extra_outcap);
+    }
+    else if (!strcmp(args[0], "source")) {
+      if (rc_recursion <= 10) {
+        rc_recursion++;
+        (void)StartRc(args[1], 0);
+        rc_recursion--;
+      }
+    }
+  }
+  fclose(fp);
+  Free(rc_name);
+  rc_name = oldrc_name;
+  return 0;
+}
+
+void FinishRc(char *rcfilename) {
+  char buf[2048];
+  FILE *fp;
+  char *oldrc_name = rc_name;
+
+  rc_name = findrcfile(rcfilename);
+
+  if (rc_name == NULL || (fp = secfopen(rc_name, "r")) == NULL) {
+    const char *rc_nonnull = rc_name ? rc_name : rcfilename;
+    if (rc_recursion)
+      Msg(errno, "%s: source %s", oldrc_name, rc_nonnull);
+    else if (RcFileName && !strcmp(RcFileName, rc_nonnull)) {
+      /*
+       * User explicitly gave us that name,
+       * this is the only case, where we get angry, if we can't read
+       * the file.
+       */
+       debug3("FinishRc:'%s','%s','%s'\n", RcFileName, rc_name ? rc_name : "(null)", rcfilename);
+       Panic(0, "Unable to open \"%s\".", rc_nonnull);
+       /* NOTREACHED */
+    }
+    debug1("FinishRc: '%s' no good. ignored\n", rc_nonnull);
+    if (rc_name)
+      Free(rc_name);
+    rc_name = oldrc_name;
+    return;
+  }
+
+  debug("finishrc is going...\n");
+  while (fgets(buf, sizeof buf, fp) != NULL)
+    RcLine(buf, sizeof buf);
+  (void) fclose(fp);
+  Free(rc_name);
+  rc_name = oldrc_name;
+}
+
+void do_source(char *rcfilename) {
+  if (rc_recursion > 10) {
+    Msg(0, "%s: source: recursion limit reached", rc_name);
+    return;
+  }
+  rc_recursion++;
+  FinishRc(rcfilename);
+  rc_recursion--;
+}
+
+
+/*
+ * Running a Command Line in the environment determined by the display.
+ * The fore window is taken from the display as well as the user.
+ * This is bad when we run detached.
+ */
+void RcLine(char *ubuf, int ubufl) {
+  char *args[MAXARGS];
+  int argl[MAXARGS];
+#ifdef MULTIUSER
+  extern struct acluser *EffectiveAclUser;      /* acl.c */
+  extern struct acluser *users;                 /* acl.c */
+#endif
+
+  if (display) {
+    fore = D_fore;
+    flayer = D_forecv->c_layer;
+  }
+  else
+    flayer = fore ? fore->w_savelayer : 0;
+  if (Parse(ubuf, ubufl, args, argl) <= 0)
+    return;
+
+#ifdef MULTIUSER
+  if (!display) {
+      /* the session owner does it, when there is no display here */
+      EffectiveAclUser = users;        
+      debug("RcLine: WARNING, no display no user! Session owner executes command\n");
+  }
+#endif
+
+  DoCommand(args, argl);
+
+#ifdef MULTIUSER
+  EffectiveAclUser = 0;
+#endif
+}
+
+/*  needs display for copybuffer access and termcap dumping  */
+void WriteFile(struct acluser *user, char *fn, int dump) {
+  /* dump==0:	create .termcap,
+   * dump==1:	hardcopy,
+   * #ifdef COPY_PASTE
+   * dump==2:	BUFFERFILE
+   * #endif COPY_PASTE 
+   * dump==1:	scrollback,
+   */
+  register int i, j, k;
+  register char *p;
+  register FILE *f;
+  char fnbuf[1024];
+  char *mode = "w";
+
+#ifdef COPY_PASTE
+  int public = 0;
+# ifdef HAVE_LSTAT
+  struct stat stb, stb2;
+  int fd, exists = 0;
+# endif
+#endif
+
+  switch (dump) {
+    case DUMP_TERMCAP:
+      if (fn == 0) {
+        i = SockName - SockPath;
+        if (i > (int)sizeof(fnbuf) - 9)
+          i = 0;
+        strncpy(fnbuf, SockPath, i);
+        strcpy(fnbuf + i, ".termcap");
+        fn = fnbuf;
+      }
+      break;
+
+    case DUMP_HARDCOPY:
+    case DUMP_SCROLLBACK:
+      if (fn == 0) {
+        if (fore == 0)
+          return;
+        if (hardcopydir && *hardcopydir && strlen(hardcopydir) < sizeof(fnbuf) - 21)
+          sprintf(fnbuf, "%s/hardcopy.%d", hardcopydir, fore->w_number);
+        else
+          sprintf(fnbuf, "hardcopy.%d", fore->w_number);
+        fn = fnbuf;
+      }
+      if (hardcopy_append && !access(fn, W_OK))
+        mode = "a";
+      break;
+
+#ifdef COPY_PASTE
+    case DUMP_EXCHANGE:
+      if (fn == 0) {
+        strncpy(fnbuf, BufferFile, sizeof(fnbuf) - 1);
+        fnbuf[sizeof(fnbuf) - 1] = 0;
+        fn = fnbuf;
+      }
+      public = !strcmp(fn, DEFAULT_BUFFERFILE);
+# ifdef HAVE_LSTAT
+      exists = !lstat(fn, &stb);
+      if (public && exists && (S_ISLNK(stb.st_mode) || stb.st_nlink > 1)) {
+        Msg(0, "No write to links, please.");
+        return;
+      }
+# endif
+      break;
+#endif
+  }
+
+  debug2("WriteFile(%d) %s\n", dump, fn);
+  if (UserContext() > 0) {
+    debug("Writefile: usercontext\n");
+#ifdef COPY_PASTE
+    if (dump == DUMP_EXCHANGE && public) {
+# ifdef HAVE_LSTAT
+      if (exists) {
+        if ((fd = open(fn, O_WRONLY, 0666)) >= 0) {
+          if (fstat(fd, &stb2) == 0 && stb.st_dev == stb2.st_dev && stb.st_ino == stb2.st_ino)
+            ftruncate(fd, 0);
+          else {
+            close(fd);
+            fd = -1;
+          }
+        }
+      }
+      else
+        fd = open(fn, O_WRONLY|O_CREAT|O_EXCL, 0666);
+      f = fd >= 0 ? fdopen(fd, mode) : 0;
+# else
+      f = fopen(fn, mode);
+# endif
+    }
+    else
+#endif /* COPY_PASTE */
+      f = fopen(fn, mode);
+        if (f == NULL) {
+          debug2("WriteFile: fopen(%s,\"%s\") failed\n", fn, mode);
+          UserReturn(0);
+        }
+        else {
+          switch (dump) {
+            case DUMP_HARDCOPY:
+            case DUMP_SCROLLBACK:
+              if (!fore)
+                break;
+              if (*mode == 'a') {
+                putc('>', f);
+                for (j = fore->w_width - 2; j > 0; j--)
+                  putc('=', f);
+                  fputs("<\n", f);
+              }
+              if (dump == DUMP_SCROLLBACK) {
+#ifdef COPY_PASTE
+                for (i = fore->w_histheight - fore->w_scrollback_height; i < fore->w_histheight; i++) {
+                  p = (char *)(WIN(i)->image);
+                    for (k = fore->w_width - 1; k >= 0 && p[k] == ' '; k--)
+                      ;
+                    for (j = 0; j <= k; j++)
+                      putc(p[j], f);
+                      putc('\n', f);
+                }
+#endif
+              }
+              for (i = 0; i < fore->w_height; i++) {
+                p = (char *)fore->w_mlines[i].image;
+                for (k = fore->w_width - 1; k >= 0 && p[k] == ' '; k--)
+                  ;
+                for (j = 0; j <= k; j++)
+                  putc(p[j], f);
+                  putc('\n', f);
+                }
+                break;
+
+            case DUMP_TERMCAP:
+              DumpTermcap(fore->w_aflag, f);
+	      break;
+
+#ifdef COPY_PASTE
+            case DUMP_EXCHANGE:
+              p = user->u_plop.buf;
+              for (i = user->u_plop.len; i-- > 0; p++)
+                if (*p == '\r' && (i == 0 || p[1] != '\n'))
+                  putc('\n', f);
+                else
+                  putc(*p, f);
+              break;
+#endif
+        }
+        (void) fclose(f);
+        UserReturn(1);
+      }
+    }
+  if (UserStatus() <= 0)
+    Msg(0, "Cannot open \"%s\"", fn);
+  else if (display && !*rc_name) {
+    switch (dump) {
+      case DUMP_TERMCAP:
+        Msg(0, "Termcap entry written to \"%s\".", fn);
+        break;
+      case DUMP_HARDCOPY:
+      case DUMP_SCROLLBACK:
+        Msg(0, "Screen image %s to \"%s\".", (*mode == 'a') ? "appended" : "written", fn);
+        break;
+#ifdef COPY_PASTE
+      case DUMP_EXCHANGE:
+        Msg(0, "Copybuffer written to \"%s\".", fn);
+#endif
+    }
+  }
+}
+
+#ifdef COPY_PASTE
+
+/*
+ * returns an allocated buffer which holds a copy of the file named fn.
+ * lenp (if nonzero) points to a location, where the buffer size should be 
+ * stored.
+ */
+char *ReadFile(char *fn, int *lenp) {
+  int i, l, size;
+  char c, *bp, *buf;
+  struct stat stb;
+
+  ASSERT(lenp);
+  debug1("ReadFile(%s)\n", fn);
+
+  if ((i = secopen(fn, O_RDONLY, 0)) < 0) {
+    Msg(errno, "no %s -- no slurp", fn);
+    return NULL;
+  }
+
+  if (fstat(i, &stb)) {
+    Msg(errno, "no good %s -- no slurp", fn);
+    close(i);
+    return NULL;
+  }
+  size = stb.st_size;
+
+  if ((buf = malloc(size)) == NULL) {
+    close(i);
+    Msg(0, "%s", strnomem);
+    return NULL;
+  }
+  errno = 0;
+
+  if ((l = read(i, buf, size)) != size) {
+    if (l < 0)
+      l = 0;
+    Msg(errno, "Got only %d bytes from %s", l, fn);
+  }
+  else {
+    if (read(i, &c, 1) > 0)
+      Msg(0, "Slurped only %d characters (of %d) into buffer - try again", l, size);
+    else
+      Msg(0, "Slurped %d characters into buffer", l);
+  }
+  close(i);
+  *lenp = l;
+  for (bp = buf; l-- > 0; bp++)
+    if (*bp == '\n' && (bp == buf || bp[-1] != '\r'))
+      *bp = '\r';
+  return buf;
+}
+
+void KillBuffers() {
+  if (UserContext() > 0)
+    UserReturn(unlink(BufferFile) ? errno : 0);
+  errno = UserStatus();
+  Msg(errno, "%s %sremoved", BufferFile, errno ? "not " : "");
+}
+#endif	/* COPY_PASTE */
+
+
+/* (Almost) secure open and fopen...  */
+
+FILE *secfopen(char *name, char *mode) {
+  FILE *fi;
+#ifndef USE_SETEUID
+  int flags, fd;
+#endif
+
+  debug2("secfopen(%s, %s)\n", name, mode);
+#ifdef USE_SETEUID
+  xseteuid(real_uid);
+  xsetegid(real_gid);
+  fi = fopen(name, mode);
+  xseteuid(eff_uid);
+  xsetegid(eff_gid);
+  return fi;
+
+#else
+  if (eff_uid == real_uid)
+    return fopen(name, mode);
+  if (mode[0] && mode[1] == '+')
+    flags = O_RDWR;
+  else
+    flags = (mode[0] == 'r') ? O_RDONLY : O_WRONLY;
+  if (mode[0] == 'w')
+    flags |= O_CREAT | O_TRUNC;
+  else if (mode[0] == 'a')
+    flags |= O_CREAT | O_APPEND;
+  else if (mode[0] != 'r') {
+    errno = EINVAL;
+    return 0;
+  }
+  if ((fd = secopen(name, flags, 0666)) < 0)
+    return 0;
+  if ((fi = fdopen(fd, mode)) == 0) {
+    close(fd);
+    return 0;
+  }
+  return fi;
+#endif
+}
+
+
+int secopen(char *name, int flags, int mode) {
+  int fd;
+#ifndef USE_SETEUID
+  int q;
+  struct stat stb;
+#endif
+
+  debug3("secopen(%s, 0x%x, 0%03o)\n", name, flags, mode);
+#ifdef USE_SETEUID
+  xseteuid(real_uid);
+  xsetegid(real_gid);
+  fd = open(name, flags, mode);
+  xseteuid(eff_uid);
+  xsetegid(eff_gid);
+  return fd;
+#else
+  if (eff_uid == real_uid)
+    return open(name, flags, mode);
+  /* Truncation/creation is done in UserContext */
+  if ((flags & O_TRUNC) || ((flags & O_CREAT) && access(name, F_OK))) {
+    if (UserContext() > 0) {
+      if ((fd = open(name, flags, mode)) >= 0) {
+        close(fd);
+        UserReturn(0);
+      }
+      if (errno == 0)
+        errno = EACCES;
+      UserReturn(errno);
+    }
+    if ((q = UserStatus())) {
+      if (q > 0)
+        errno = q;
+      return -1;
+    }
+  }
+  if (access(name, F_OK))
+    return -1;
+  if ((fd = open(name, flags & ~(O_TRUNC | O_CREAT), 0)) < 0)
+    return -1;
+  debug("open successful\n");
+  if (fstat(fd, &stb)) {
+    close(fd);
+    return -1;
+  }
+  debug("fstat successful\n");
+  if (stb.st_uid != real_uid) {
+    switch (flags & (O_RDONLY | O_WRONLY | O_RDWR)) {
+      case O_RDONLY:
+        q = 0004;
+        break;
+      case O_WRONLY:
+        q = 0002;
+        break;
+      default:
+        q = 0006;
+        break;
+    }
+    if ((stb.st_mode & q) != q) {
+      debug1("secopen: permission denied (%03o)\n", stb.st_mode & 07777);
+      close(fd);
+      errno = EACCES;
+      return -1;
+    }
+  }
+  debug1("secopen ok - returning %d\n", fd);
+  return fd;
+#endif
+}
+
+
+int printpipe(struct win *p, char *cmd) {
+  int pi[2];
+  if (pipe(pi)) {
+    WMsg(p, errno, "printing pipe");
+    return -1;
+  }
+  switch (fork()) {
+    case -1:
+      WMsg(p, errno, "printing fork");
+      return -1;
+    case 0:
+      display = p->w_pdisplay;
+      displays = 0;
+      ServerSocket = -1;
+#ifdef DEBUG
+      if (dfp && dfp != stderr)
+        fclose(dfp);
+#endif
+      close(0);
+      dup(pi[0]);
+      closeallfiles(0);
+      if (setgid(real_gid) || setuid(real_uid))
+        Panic(errno, "printpipe setuid");
+      eff_uid = real_uid;
+      eff_gid = real_gid;
+
+#ifdef SIGPIPE
+      signal(SIGPIPE, SIG_DFL);
+#endif
+      execl("/bin/sh", "sh", "-c", cmd, (char *)0);
+      Panic(errno, "/bin/sh");
+    default:
+      break;
+  }
+  close(pi[0]);
+  return pi[1];
+}
+
+int readpipe(char **cmdv) {
+  int pi[2];
+
+  if (pipe(pi)) {
+    Msg(errno, "pipe");
+    return -1;
+  }
+
+  switch (fork()) {
+  case -1:
+    Msg(errno, "fork");
+    return -1;
+  case 0:
+    displays = 0;
+    ServerSocket = -1;
+#ifdef DEBUG
+    if (dfp && dfp != stderr)
+      fclose(dfp);
+#endif
+    close(1);
+    if (dup(pi[1]) != 1) {
+      close(pi[1]);
+      Panic(0, "dup");
+    }
+    closeallfiles(1);
+
+    if (setgid(real_gid) || setuid(real_uid)) {
+      close(1);
+      Panic(errno, "setuid/setgid");
+    }
+    eff_uid = real_uid;
+    eff_gid = real_gid;
+#ifdef SIGPIPE
+    signal(SIGPIPE, SIG_DFL);
+#endif
+    execvp(*cmdv, cmdv);
+    close(1);
+    Panic(errno, "%s", *cmdv);
+  default:
+    break;
+  }
+  close(pi[1]);
+  return pi[0];
+}