X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/50e95852a7408d6188042a9c7923e42553722a2a..110277098f846c98cbb1f155fe7d53ecca64cc1a:/apt-pkg/deb/dpkgpm.cc

diff --git a/apt-pkg/deb/dpkgpm.cc b/apt-pkg/deb/dpkgpm.cc
index 4323b5fd2..11bf827d7 100644
--- a/apt-pkg/deb/dpkgpm.cc
+++ b/apt-pkg/deb/dpkgpm.cc
@@ -342,9 +342,12 @@ bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 */
 void pkgDPkgPM::DoStdin(int master)
 {
-   char input_buf[256] = {0,}; 
-   int len = read(0, input_buf, sizeof(input_buf));
-   write(master, input_buf, len);
+   unsigned char input_buf[256] = {0,}; 
+   ssize_t len = read(0, input_buf, sizeof(input_buf));
+   if (len)
+      write(master, input_buf, len);
+   else
+      stdin_is_dev_null = true;
 }
 									/*}}}*/
 // DPkgPM::DoTerminalPty - Read the terminal pty and write log		/*{{{*/
@@ -354,10 +357,18 @@ void pkgDPkgPM::DoStdin(int master)
  */
 void pkgDPkgPM::DoTerminalPty(int master)
 {
-   char term_buf[1024] = {0,};
+   unsigned char term_buf[1024] = {0,0, };
 
-   int len=read(master, term_buf, sizeof(term_buf));
-   if(len <= 0)
+   ssize_t len=read(master, term_buf, sizeof(term_buf));
+   if(len == -1 && errno == EIO)
+   {
+      // this happens when the child is about to exit, we
+      // give it time to actually exit, otherwise we run
+      // into a race
+      usleep(500000);
+      return;
+   }  
+   if(len <= 0) 
       return;
    write(1, term_buf, len);
    if(term_out)
@@ -535,6 +546,27 @@ bool pkgDPkgPM::CloseLog()
    return true;
 }
 
+/*{{{*/
+// This implements a racy version of pselect for those architectures
+// that don't have a working implementation.
+// FIXME: Probably can be removed on Lenny+1
+static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
+   fd_set *exceptfds, const struct timespec *timeout,
+   const sigset_t *sigmask)
+{
+   sigset_t origmask;
+   struct timeval tv;
+   int retval;
+
+   tv.tv_sec = timeout->tv_sec;
+   tv.tv_usec = timeout->tv_nsec/1000;
+
+   sigprocmask(SIG_SETMASK, sigmask, &origmask);
+   retval = select(nfds, readfds, writefds, exceptfds, &tv);
+   sigprocmask(SIG_SETMASK, &origmask, 0);
+   return retval;
+}
+/*}}}*/
 
 // DPkgPM::Go - Run the sequence					/*{{{*/
 // ---------------------------------------------------------------------
@@ -610,6 +642,8 @@ bool pkgDPkgPM::Go(int OutStatusFd)
       }
    }   
 
+   stdin_is_dev_null = false;
+
    // create log
    OpenLog();
 
@@ -816,7 +850,12 @@ bool pkgDPkgPM::Go(int OutStatusFd)
 
       // setups fds
       fd_set rfds;
-      struct timeval tv;
+      struct timespec tv;
+      sigset_t sigmask;
+      sigset_t original_sigmask;
+      sigemptyset(&sigmask);
+      sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
+
       int select_ret;
       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 	 if(res < 0) {
@@ -834,23 +873,28 @@ bool pkgDPkgPM::Go(int OutStatusFd)
 
 	 // wait for input or output here
 	 FD_ZERO(&rfds);
-	 FD_SET(0, &rfds); 
+	 if (!stdin_is_dev_null)
+	    FD_SET(0, &rfds); 
 	 FD_SET(_dpkgin, &rfds);
 	 if(master >= 0)
 	    FD_SET(master, &rfds);
 	 tv.tv_sec = 1;
-	 tv.tv_usec = 0;
-	 select_ret = select(max(master, _dpkgin)+1, &rfds, NULL, NULL, &tv);
- 	 if (select_ret == 0) 
- 	    continue;
- 	 else if (select_ret < 0 && errno == EINTR)
- 	    continue;
- 	 else if (select_ret < 0) 
-	 {
- 	    perror("select() returned error");
- 	    continue;
- 	 } 
-
+	 tv.tv_nsec = 0;
+	 select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL, 
+			      &tv, &original_sigmask);
+	 if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
+	    select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
+				      NULL, &tv, &original_sigmask);
+	 if (select_ret == 0) 
+  	    continue;
+  	 else if (select_ret < 0 && errno == EINTR)
+  	    continue;
+  	 else if (select_ret < 0) 
+ 	 {
+  	    perror("select() returned error");
+  	    continue;
+  	 } 
+	 
 	 if(master >= 0 && FD_ISSET(master, &rfds))
 	    DoTerminalPty(master);
 	 if(master >= 0 && FD_ISSET(0, &rfds))
@@ -864,8 +908,11 @@ bool pkgDPkgPM::Go(int OutStatusFd)
       signal(SIGQUIT,old_SIGQUIT);
       signal(SIGINT,old_SIGINT);
 
-      if(master >= 0 && slave >= 0)
+      if(master >= 0) 
+      {
 	 tcsetattr(0, TCSAFLUSH, &tt);
+	 close(master);
+      }
        
       // Check for an error code.
       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)