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authorUlrich Drepper <drepper@redhat.com>2008-07-24 00:29:29 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 13:47:28 -0400
commit336dd1f70ff62d7dd8655228caed4c5bfc818c56 (patch)
tree1441b76ea5f08f44167f41867f3555ac53712ebb /include/asm-x86
parenta0998b50c3f0b8fdd265c63e0032f86ebe377dbf (diff)
flag parameters: dup2
This patch adds the new dup3 syscall. It extends the old dup2 syscall by one parameter which is meant to hold a flag value. Support for the O_CLOEXEC flag is added in this patch. 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_dup3 # ifdef __x86_64__ # define __NR_dup3 292 # elif defined __i386__ # define __NR_dup3 330 # else # error "need __NR_dup3" # endif #endif int main (void) { int fd = syscall (__NR_dup3, 1, 4, 0); if (fd == -1) { puts ("dup3(0) failed"); return 1; } int coe = fcntl (fd, F_GETFD); if (coe == -1) { puts ("fcntl failed"); return 1; } if (coe & FD_CLOEXEC) { puts ("dup3(0) set close-on-exec flag"); return 1; } close (fd); fd = syscall (__NR_dup3, 1, 4, O_CLOEXEC); if (fd == -1) { puts ("dup3(O_CLOEXEC) failed"); return 1; } coe = fcntl (fd, F_GETFD); if (coe == -1) { puts ("fcntl failed"); return 1; } if ((coe & FD_CLOEXEC) == 0) { puts ("dup3(O_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/asm-x86')
-rw-r--r--include/asm-x86/unistd_32.h1
-rw-r--r--include/asm-x86/unistd_64.h2
2 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-x86/unistd_32.h b/include/asm-x86/unistd_32.h
index a37d6b0c4e1e..a1f6383bf695 100644
--- a/include/asm-x86/unistd_32.h
+++ b/include/asm-x86/unistd_32.h
@@ -335,6 +335,7 @@
335#define __NR_signalfd4 327 335#define __NR_signalfd4 327
336#define __NR_eventfd2 328 336#define __NR_eventfd2 328
337#define __NR_epoll_create2 329 337#define __NR_epoll_create2 329
338#define __NR_dup3 330
338 339
339#ifdef __KERNEL__ 340#ifdef __KERNEL__
340 341
diff --git a/include/asm-x86/unistd_64.h b/include/asm-x86/unistd_64.h
index a1a4a5b6e5ee..f0fb2bd40cdb 100644
--- a/include/asm-x86/unistd_64.h
+++ b/include/asm-x86/unistd_64.h
@@ -647,6 +647,8 @@ __SYSCALL(__NR_signalfd4, sys_signalfd4)
647__SYSCALL(__NR_eventfd2, sys_eventfd2) 647__SYSCALL(__NR_eventfd2, sys_eventfd2)
648#define __NR_epoll_create2 291 648#define __NR_epoll_create2 291
649__SYSCALL(__NR_epoll_create2, sys_epoll_create2) 649__SYSCALL(__NR_epoll_create2, sys_epoll_create2)
650#define __NR_dup3 292
651__SYSCALL(__NR_dup3, sys_dup3)
650 652
651 653
652#ifndef __NO_STUBS 654#ifndef __NO_STUBS