d9ad918a14
Regular files are always write-ready, so non-blocking I/O does not give any benefits for them. More than that - if libevent is using "epoll" to track fd events, epoll_ctl will refuse attempt to add an fd pointing to a regular file descriptor with EPERM. This fix checks the object referenced by fd and avoids event_add using event_active instead. In the original configuration that uncovered this issue "epoll" was used in libevent, it was triggering the following warning message: "[warn] Epoll ADD(1) on fd 0 failed. Old events were 0; read change was 1 (add); write change was 0 (none): Operation not permitted" And the side effect was accumulation of all output in mpirun memory and actually writing it only at mpirun exit. Signed-off-by: Artem Polyakov <artpol84@gmail.com>
101 строка
2.5 KiB
C
101 строка
2.5 KiB
C
/*
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* Copyright (c) 2008-2014 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2009 Sandia National Laboratories. All rights reserved.
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* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
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*
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/* @file */
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#ifndef OPAL_UTIL_FD_H_
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#define OPAL_UTIL_FD_H_
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#include "opal_config.h"
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BEGIN_C_DECLS
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/**
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* Read a complete buffer from a file descriptor.
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*
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* @param fd File descriptor
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* @param len Number of bytes to read
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* @param buffer Pre-allocated buffer (large enough to hold len bytes)
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*
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* @returns OPAL_SUCCESS upon success.
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* @returns OPAL_ERR_TIMEOUT if the fd closes before reading the full amount.
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* @returns OPAL_ERR_IN_ERRNO otherwise.
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*
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* Loop over reading from the fd until len bytes are read or an error
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* occurs. EAGAIN and EINTR are transparently handled.
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*/
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OPAL_DECLSPEC int opal_fd_read(int fd, int len, void *buffer);
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/**
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* Write a complete buffer to a file descriptor.
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*
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* @param fd File descriptor
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* @param len Number of bytes to write
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* @param buffer Buffer to write from
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*
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* @returns OPAL_SUCCESS upon success.
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* @returns OPAL_ERR_IN_ERRNO otherwise.
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*
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* Loop over writing to the fd until len bytes are written or an error
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* occurs. EAGAIN and EINTR are transparently handled.
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*/
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OPAL_DECLSPEC int opal_fd_write(int fd, int len, const void *buffer);
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/**
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* Convenience function to set a file descriptor to be close-on-exec.
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*
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* @param fd File descriptor
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*
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* @returns OPAL_SUCCESS upon success (or if the system does not
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* support close-on-exec behavior).
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* @returns OPAL_ERR_IN_ERRNO otherwise.
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*
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* This is simply a convenience function because there's a few steps
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* to setting a file descriptor to be close-on-exec.
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*/
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OPAL_DECLSPEC int opal_fd_set_cloexec(int fd);
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/**
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* Convenience function to check if fd point to an accessible regular file.
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*
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* @param fd File descriptor
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*
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* @returns true if "fd" points to a regular file.
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* @returns false otherwise.
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*/
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OPAL_DECLSPEC bool opal_fd_is_regular(int fd);
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/**
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* Convenience function to check if fd point to an accessible character device.
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*
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* @param fd File descriptor
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*
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* @returns true if "fd" points to a regular file.
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* @returns false otherwise.
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*/
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OPAL_DECLSPEC bool opal_fd_is_chardev(int fd);
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/**
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* Convenience function to check if fd point to an accessible block device.
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*
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* @param fd File descriptor
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*
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* @returns true if "fd" points to a regular file.
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* @returns false otherwise.
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*/
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OPAL_DECLSPEC bool opal_fd_is_blkdev(int fd);
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END_C_DECLS
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#endif
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