1. 23 5月, 2011 1 次提交
  2. 03 5月, 2011 1 次提交
  3. 19 2月, 2009 1 次提交
  4. 25 7月, 2008 2 次提交
    • U
      flag parameters: NONBLOCK in timerfd_create · 6b1ef0e6
      Ulrich Drepper 提交于
      This patch adds support for the TFD_NONBLOCK flag to timerfd_create.  The
      additional changes needed are minimal.
      
      The following test must be adjusted for architectures other than x86 and
      x86-64 and in case the syscall numbers changed.
      
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      #include <fcntl.h>
      #include <stdio.h>
      #include <time.h>
      #include <unistd.h>
      #include <sys/syscall.h>
      
      #ifndef __NR_timerfd_create
      # ifdef __x86_64__
      #  define __NR_timerfd_create 283
      # elif defined __i386__
      #  define __NR_timerfd_create 322
      # else
      #  error "need __NR_timerfd_create"
      # endif
      #endif
      
      #define TFD_NONBLOCK O_NONBLOCK
      
      int
      main (void)
      {
        int fd = syscall (__NR_timerfd_create, CLOCK_REALTIME, 0);
        if (fd == -1)
          {
            puts ("timerfd_create(0) failed");
            return 1;
          }
        int fl = fcntl (fd, F_GETFL);
        if (fl == -1)
          {
            puts ("fcntl failed");
            return 1;
          }
        if (fl & O_NONBLOCK)
          {
            puts ("timerfd_create(0) set non-blocking mode");
            return 1;
          }
        close (fd);
      
        fd = syscall (__NR_timerfd_create, CLOCK_REALTIME, TFD_NONBLOCK);
        if (fd == -1)
          {
            puts ("timerfd_create(TFD_NONBLOCK) failed");
            return 1;
          }
        fl = fcntl (fd, F_GETFL);
        if (fl == -1)
          {
            puts ("fcntl failed");
            return 1;
          }
        if ((fl & O_NONBLOCK) == 0)
          {
            puts ("timerfd_create(TFD_NONBLOCK) set non-blocking mode");
            return 1;
          }
        close (fd);
      
        puts ("OK");
      
        return 0;
      }
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      Signed-off-by: NUlrich Drepper <drepper@redhat.com>
      Acked-by: NDavide Libenzi <davidel@xmailserver.org>
      Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      6b1ef0e6
    • U
      flag parameters: timerfd_create · 11fcb6c1
      Ulrich Drepper 提交于
      The timerfd_create syscall already has a flags parameter.  It just is
      unused so far.  This patch changes this by introducing the TFD_CLOEXEC
      flag to set the close-on-exec flag for the returned file descriptor.
      
      A new name TFD_CLOEXEC is introduced which in this implementation must
      have the same value as O_CLOEXEC.
      
      The following test must be adjusted for architectures other than x86 and
      x86-64 and in case the syscall numbers changed.
      
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      #include <fcntl.h>
      #include <stdio.h>
      #include <time.h>
      #include <unistd.h>
      #include <sys/syscall.h>
      
      #ifndef __NR_timerfd_create
      # ifdef __x86_64__
      #  define __NR_timerfd_create 283
      # elif defined __i386__
      #  define __NR_timerfd_create 322
      # else
      #  error "need __NR_timerfd_create"
      # endif
      #endif
      
      #define TFD_CLOEXEC O_CLOEXEC
      
      int
      main (void)
      {
        int fd = syscall (__NR_timerfd_create, CLOCK_REALTIME, 0);
        if (fd == -1)
          {
            puts ("timerfd_create(0) failed");
            return 1;
          }
        int coe = fcntl (fd, F_GETFD);
        if (coe == -1)
          {
            puts ("fcntl failed");
            return 1;
          }
        if (coe & FD_CLOEXEC)
          {
            puts ("timerfd_create(0) set close-on-exec flag");
            return 1;
          }
        close (fd);
      
        fd = syscall (__NR_timerfd_create, CLOCK_REALTIME, TFD_CLOEXEC);
        if (fd == -1)
          {
            puts ("timerfd_create(TFD_CLOEXEC) failed");
            return 1;
          }
        coe = fcntl (fd, F_GETFD);
        if (coe == -1)
          {
            puts ("fcntl failed");
            return 1;
          }
        if ((coe & FD_CLOEXEC) == 0)
          {
            puts ("timerfd_create(TFD_CLOEXEC) set close-on-exec flag");
            return 1;
          }
        close (fd);
      
        puts ("OK");
      
        return 0;
      }
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      Signed-off-by: NUlrich Drepper <drepper@redhat.com>
      Acked-by: NDavide Libenzi <davidel@xmailserver.org>
      Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      11fcb6c1
  5. 11 5月, 2007 1 次提交
    • D
      signal/timer/event: timerfd core · b215e283
      Davide Libenzi 提交于
      This patch introduces a new system call for timers events delivered though
      file descriptors.  This allows timer event to be used with standard POSIX
      poll(2), select(2) and read(2).  As a consequence of supporting the Linux
      f_op->poll subsystem, they can be used with epoll(2) too.
      
      The system call is defined as:
      
      int timerfd(int ufd, int clockid, int flags, const struct itimerspec *utmr);
      
      The "ufd" parameter allows for re-use (re-programming) of an existing timerfd
      w/out going through the close/open cycle (same as signalfd).  If "ufd" is -1,
      s new file descriptor will be created, otherwise the existing "ufd" will be
      re-programmed.
      
      The "clockid" parameter is either CLOCK_MONOTONIC or CLOCK_REALTIME.  The time
      specified in the "utmr->it_value" parameter is the expiry time for the timer.
      
      If the TFD_TIMER_ABSTIME flag is set in "flags", this is an absolute time,
      otherwise it's a relative time.
      
      If the time specified in the "utmr->it_interval" is not zero (.tv_sec == 0,
      tv_nsec == 0), this is the period at which the following ticks should be
      generated.
      
      The "utmr->it_interval" should be set to zero if only one tick is requested.
      Setting the "utmr->it_value" to zero will disable the timer, or will create a
      timerfd without the timer enabled.
      
      The function returns the new (or same, in case "ufd" is a valid timerfd
      descriptor) file, or -1 in case of error.
      
      As stated before, the timerfd file descriptor supports poll(2), select(2) and
      epoll(2).  When a timer event happened on the timerfd, a POLLIN mask will be
      returned.
      
      The read(2) call can be used, and it will return a u32 variable holding the
      number of "ticks" that happened on the interface since the last call to
      read(2).  The read(2) call supportes the O_NONBLOCK flag too, and EAGAIN will
      be returned if no ticks happened.
      
      A quick test program, shows timerfd working correctly on my amd64 box:
      
      http://www.xmailserver.org/timerfd-test.c
      
      [akpm@linux-foundation.org: add sys_timerfd to sys_ni.c]
      Signed-off-by: NDavide Libenzi <davidel@xmailserver.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b215e283