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authorUlrich Drepper <drepper@redhat.com>2008-07-23 21:29:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:29 -0700
commitbe61a86d7237dd80510615f38ae21d6e1e98660c (patch)
tree3dfe6c8275c724533f88525970a4065ae795f6e3
parent6b1ef0e60d42f2fdaec26baee8327eb156347b4f (diff)
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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>
-rw-r--r--fs/pipe.c14
-rw-r--r--include/linux/fs.h4
-rw-r--r--kernel/kmod.c4
3 files changed, 11 insertions, 11 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 68e82061070..10c4e9aa5c4 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -950,7 +950,7 @@ fail_inode:
return NULL;
}
-struct file *create_write_pipe(void)
+struct file *create_write_pipe(int flags)
{
int err;
struct inode *inode;
@@ -983,7 +983,7 @@ struct file *create_write_pipe(void)
goto err_dentry;
f->f_mapping = inode->i_mapping;
- f->f_flags = O_WRONLY;
+ f->f_flags = O_WRONLY | (flags & O_NONBLOCK);
f->f_version = 0;
return f;
@@ -1007,7 +1007,7 @@ void free_write_pipe(struct file *f)
put_filp(f);
}
-struct file *create_read_pipe(struct file *wrf)
+struct file *create_read_pipe(struct file *wrf, int flags)
{
struct file *f = get_empty_filp();
if (!f)
@@ -1019,7 +1019,7 @@ struct file *create_read_pipe(struct file *wrf)
f->f_mapping = wrf->f_path.dentry->d_inode->i_mapping;
f->f_pos = 0;
- f->f_flags = O_RDONLY;
+ f->f_flags = O_RDONLY | (flags & O_NONBLOCK);
f->f_op = &read_pipe_fops;
f->f_mode = FMODE_READ;
f->f_version = 0;
@@ -1033,13 +1033,13 @@ int do_pipe_flags(int *fd, int flags)
int error;
int fdw, fdr;
- if (flags & ~O_CLOEXEC)
+ if (flags & ~(O_CLOEXEC | O_NONBLOCK))
return -EINVAL;
- fw = create_write_pipe();
+ fw = create_write_pipe(flags);
if (IS_ERR(fw))
return PTR_ERR(fw);
- fr = create_read_pipe(fw);
+ fr = create_read_pipe(fw, flags);
error = PTR_ERR(fr);
if (IS_ERR(fr))
goto err_write_pipe;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0e80cd717d3..4b86f806014 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1778,8 +1778,8 @@ static inline void allow_write_access(struct file *file)
}
extern int do_pipe(int *);
extern int do_pipe_flags(int *, int);
-extern struct file *create_read_pipe(struct file *f);
-extern struct file *create_write_pipe(void);
+extern struct file *create_read_pipe(struct file *f, int flags);
+extern struct file *create_write_pipe(int flags);
extern void free_write_pipe(struct file *);
extern struct file *do_filp_open(int dfd, const char *pathname,
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 90d7af1c165..2989f67c444 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -417,12 +417,12 @@ int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
{
struct file *f;
- f = create_write_pipe();
+ f = create_write_pipe(0);
if (IS_ERR(f))
return PTR_ERR(f);
*filp = f;
- f = create_read_pipe(f);
+ f = create_read_pipe(f, 0);
if (IS_ERR(f)) {
free_write_pipe(*filp);
return PTR_ERR(f);