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authorUlrich Drepper <drepper@redhat.com>2008-07-24 00:29:27 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 13:47:28 -0400
commita0998b50c3f0b8fdd265c63e0032f86ebe377dbf (patch)
tree9132ecb7ef925374edabcaeea44e0287eb5043f4 /include/linux/syscalls.h
parent11fcb6c14676023d0bd437841f5dcd670e7990a0 (diff)
flag parameters: epoll_create
This patch adds the new epoll_create2 syscall. It extends the old epoll_create syscall by one parameter which is meant to hold a flag value. In this patch the only flag support is EPOLL_CLOEXEC which causes the close-on-exec flag for the returned file descriptor to be set. A new name EPOLL_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_epoll_create2 # ifdef __x86_64__ # define __NR_epoll_create2 291 # elif defined __i386__ # define __NR_epoll_create2 329 # else # error "need __NR_epoll_create2" # endif #endif #define EPOLL_CLOEXEC O_CLOEXEC int main (void) { int fd = syscall (__NR_epoll_create2, 1, 0); if (fd == -1) { puts ("epoll_create2(0) failed"); return 1; } int coe = fcntl (fd, F_GETFD); if (coe == -1) { puts ("fcntl failed"); return 1; } if (coe & FD_CLOEXEC) { puts ("epoll_create2(0) set close-on-exec flag"); return 1; } close (fd); fd = syscall (__NR_epoll_create2, 1, EPOLL_CLOEXEC); if (fd == -1) { puts ("epoll_create2(EPOLL_CLOEXEC) failed"); return 1; } coe = fcntl (fd, F_GETFD); if (coe == -1) { puts ("fcntl failed"); return 1; } if ((coe & FD_CLOEXEC) == 0) { puts ("epoll_create2(EPOLL_CLOEXEC) set close-on-exec flag"); return 1; } close (fd); puts ("OK"); return 0; } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Ulrich Drepper <drepper@redhat.com> Acked-by: Davide Libenzi <davidel@xmailserver.org> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/syscalls.h')
-rw-r--r--include/linux/syscalls.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 9ab09926a7f2..85953240f28c 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -430,6 +430,7 @@ asmlinkage long sys_poll(struct pollfd __user *ufds, unsigned int nfds,
430asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp, 430asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp,
431 fd_set __user *exp, struct timeval __user *tvp); 431 fd_set __user *exp, struct timeval __user *tvp);
432asmlinkage long sys_epoll_create(int size); 432asmlinkage long sys_epoll_create(int size);
433asmlinkage long sys_epoll_create2(int size, int flags);
433asmlinkage long sys_epoll_ctl(int epfd, int op, int fd, 434asmlinkage long sys_epoll_ctl(int epfd, int op, int fd,
434 struct epoll_event __user *event); 435 struct epoll_event __user *event);
435asmlinkage long sys_epoll_wait(int epfd, struct epoll_event __user *events, 436asmlinkage long sys_epoll_wait(int epfd, struct epoll_event __user *events,