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flag parameters: NONBLOCK in pipe

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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>
This commit is contained in:
Ulrich Drepper 2008-07-23 21:29:40 -07:00 • committed by Linus Torvalds
parent 6b1ef0e60d
commit be61a86d72
3 changed files with 11 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
fs/pipe.c
View file

@ -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;

4
include/linux/fs.h
View file

@ -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,

4
kernel/kmod.c
View file

@ -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);