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Move pipe() and mkpipe() to nuttx/libc. Change syscalls to pipe2() and mkfifo2()

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This commit is contained in:
Gregory Nutt
2016-07-19 14:15:26 -06:00
parent 671d7fae31
commit b28fa8a609
10 changed files with 185 additions and 72 deletions
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libc/misc/Make.defs
+8 -4
View File
@@ -1,7 +1,7 @@
############################################################################
# libc/misc/Make.defs
#
# Copyright (C) 2011-2012, 2014 Gregory Nutt. All rights reserved.
# Copyright (C) 2011-2012, 2014, 2016 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
@@ -57,7 +57,11 @@ ifeq ($(CONFIG_LIBC_IOCTL_VARIADIC),y)
CSRCS += lib_ioctl.c
endif
else
ifeq ($(CONFIG_PIPES),y)
CSRCS += lib_mkfifo.c
endif
else # CONFIG_NFILE_DESCRIPTORS > 0
ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
CSRCS += lib_sendfile.c
@@ -70,8 +74,8 @@ ifeq ($(CONFIG_LIBC_IOCTL_VARIADIC),y)
CSRCS += lib_ioctl.c
endif
endif
endif
endif # CONFIG_NSOCKET_DESCRIPTORS > 0
endif # CONFIG_NFILE_DESCRIPTORS > 0
# Add the miscellaneous C files to the build
libc/misc/lib_mkfifo.c
+86
View File
@@ -0,0 +1,86 @@
/****************************************************************************
* libc/misc/lib_mkfifo.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/stat.h>
#if CONFIG_DEV_FIFO_SIZE > 0
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mkfifo
*
* Description:
* mkfifo() makes a FIFO device driver file with name 'pathname.' Unlike
* Linux, a NuttX FIFO is not a special file type but simply a device
* driver instance. 'mode' specifies the FIFO's permissions.
*
* Once the FIFO has been created by mkfifo(), any thread can open it for
* reading or writing, in the same way as an ordinary file. However, it
* must have been opened from both reading and writing before input or
* output can be performed. This FIFO implementation will block all
* attempts to open a FIFO read-only until at least one thread has opened
* the FIFO for writing.
*
* If all threads that write to the FIFO have closed, subsequent calls to
* read() on the FIFO will return 0 (end-of-file).
*
* Inputs:
* pathname - The full path to the FIFO instance to attach to or to create
* (if not already created).
* mode - Ignored for now
*
* Return:
* 0 is returned on success; otherwise, -1 is returned with errno set
* appropriately.
*
****************************************************************************/
int mkfifo(FAR const char *pathname, mode_t mode)
{
return mkfifo2(pathname, mode, CONFIG_DEV_FIFO_SIZE);
}
#endif /* CONFIG_DEV_FIFO_SIZE > 0 */