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/* | ||
* Copyright (C) 2013 Freie Universität Berlin | ||
* | ||
* This file subject to the terms and conditions of the GNU Lesser General | ||
* Public License. See the file LICENSE in the top level directory for more | ||
* details. | ||
*/ | ||
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/** | ||
* @addtogroup posix | ||
* @{ | ||
*/ | ||
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/** | ||
* @file unistd.h | ||
* @brief standard symbolic constants and types | ||
* @see <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html"> | ||
* The Open Group Base Specifications Issue 7, <unistd.h> | ||
* </a> | ||
* | ||
* @author Freie Universität Berlin | ||
* @author Martin Lenders <mlenders@inf.fu-berlin.de> | ||
*/ | ||
#ifndef _UNISTD_H | ||
#define _UNISTD_H | ||
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/** | ||
* @brief Close a file descriptor. | ||
* @details shall deallocate the file descriptor indicated by *fildes*. To | ||
* deallocate means to make the file descriptor available for return | ||
* by subsequent calls to open() or other functions that allocate file | ||
* descriptors. All outstanding record locks owned by the process on | ||
* the file associated with the file descriptor shall be removed (that | ||
* is, unlocked). | ||
* | ||
* @see <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html"> | ||
* The Open Group Base Specification Issue 7, close | ||
* </a> | ||
* | ||
* @param[in] fildes The file descriptor to the file which is to close. | ||
* @return Upon successful completion, 0 shall be returned; otherwise, -1 | ||
* shall be returned and errno set to indicate the error. | ||
*/ | ||
int close(int fildes); | ||
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/** | ||
* @} | ||
*/ | ||
#endif /* _UNISTD_H */ |
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/* | ||
* Copyright (C) 2013 Freie Universität Berlin | ||
* | ||
* This file subject to the terms and conditions of the GNU Lesser General | ||
* Public License. See the file LICENSE in the top level directory for more | ||
* details. | ||
*/ | ||
#include <errno.h> | ||
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#include "fd.h" | ||
#include "unistd.h" | ||
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int close(int fildes) | ||
{ | ||
fd_t *fd_obj = fd_get(fildes); | ||
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if (!fd_obj) { | ||
errno = EBADF; | ||
return -1; | ||
} | ||
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if (fd_obj->close(fd_obj->fd) < 0) { | ||
errno = EIO; // EINTR may not occur since RIOT has no signals yet. | ||
return -1; | ||
} | ||
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fd_destroy(fd_obj->fd); | ||
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return 0; | ||
} |