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authorUlrich Drepper <drepper@redhat.com>2008-07-24 00:29:40 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 13:47:29 -0400
commitbe61a86d7237dd80510615f38ae21d6e1e98660c (patch)
tree3dfe6c8275c724533f88525970a4065ae795f6e3 /include/linux/fs.h
parent6b1ef0e60d42f2fdaec26baee8327eb156347b4f (diff)
flag parameters: NONBLOCK in pipe
This patch adds O_NONBLOCK support to pipe2. It is minimally more involved than the patches for eventfd et.al but still trivial. The interfaces of the create_write_pipe and create_read_pipe helper functions were changed and the one other caller as well. 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 <unistd.h> #include <sys/syscall.h> #ifndef __NR_pipe2 # ifdef __x86_64__ # define __NR_pipe2 293 # elif defined __i386__ # define __NR_pipe2 331 # else # error "need __NR_pipe2" # endif #endif int main (void) { int fds[2]; if (syscall (__NR_pipe2, fds, 0) == -1) { puts ("pipe2(0) failed"); return 1; } for (int i = 0; i < 2; ++i) { int fl = fcntl (fds[i], F_GETFL); if (fl == -1) { puts ("fcntl failed"); return 1; } if (fl & O_NONBLOCK) { printf ("pipe2(0) set non-blocking mode for fds[%d]\n", i); return 1; } close (fds[i]); } if (syscall (__NR_pipe2, fds, O_NONBLOCK) == -1) { puts ("pipe2(O_NONBLOCK) failed"); return 1; } for (int i = 0; i < 2; ++i) { int fl = fcntl (fds[i], F_GETFL); if (fl == -1) { puts ("fcntl failed"); return 1; } if ((fl & O_NONBLOCK) == 0) { printf ("pipe2(O_NONBLOCK) does not set non-blocking mode for fds[%d]\n", i); return 1; } close (fds[i]); } 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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r--include/linux/fs.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0e80cd717d32..4b86f806014c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1778,8 +1778,8 @@ static inline void allow_write_access(struct file *file)
1778} 1778}
1779extern int do_pipe(int *); 1779extern int do_pipe(int *);
1780extern int do_pipe_flags(int *, int); 1780extern int do_pipe_flags(int *, int);
1781extern struct file *create_read_pipe(struct file *f); 1781extern struct file *create_read_pipe(struct file *f, int flags);
1782extern struct file *create_write_pipe(void); 1782extern struct file *create_write_pipe(int flags);
1783extern void free_write_pipe(struct file *); 1783extern void free_write_pipe(struct file *);
1784 1784
1785extern struct file *do_filp_open(int dfd, const char *pathname, 1785extern struct file *do_filp_open(int dfd, const char *pathname,