111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
#ifndef __EVIL_FCNTL_H__
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#define __EVIL_FCNTL_H__
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# include <sys/types.h>
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/**
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* @def FD_CLOEXEC
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* Specifies that the file descriptor should be closed when an exec()
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* function is invoked.
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*/
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# define FD_CLOEXEC 1
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/**
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* @def O_NONBLOCK
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* Specifies that the socket is in non-blocking mode.
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*/
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# define O_NONBLOCK 04000
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/**
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* @def F_SETFD
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* Specifies that fcntl() should set the file descriptor flags
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* associated with the filedes argument.
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*/
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/**
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* @def F_SETLK
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* Specifies that fcntl() should set or clear a file segment lock
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* according to the lock description pointed to by the third argument.
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*/
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/**
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* @def F_SETLKW
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* Equivalent to F_SETLK except that if a shared or exclusive lock
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* is blocked by other locks, the thread shall wait until the request
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* can be satisfied.
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*/
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# define F_GETFD 1
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# define F_SETFD 2
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# define F_SETFL 4
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# define F_SETLK 6
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# define F_SETLKW 7
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/**
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* @def F_RDLCK
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* Read (or shared) lock
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*/
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/**
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* @def F_WRLCK
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* Write (or exclusive) lock
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*/
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/**
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* @def F_UNLCK
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* Remove lock
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*/
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# ifndef F_RDLCK
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# define F_RDLCK 0
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# define F_WRLCK 1
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# define F_UNLCK 2
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# endif /* ! F_RDLCK */
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/**
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* @struct flock
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* @brief A structure that controls the lock of a file descriptor.
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*/
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struct flock
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{
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short int l_type; /**< lock type: read, write, ... */
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short int l_whence; /**< type of l_start */
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off_t l_start; /**< starting offset */
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off_t l_len; /**< 0 means end of the file */
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pid_t l_pid; /**< lock owner */
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};
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/**
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* @brief Provide control over file descriptors.
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*
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* @param fd The file descriptor.
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* @param cmd The type of control.
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* @return 0 on success, -1 otherwise.
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*
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* Performs one of various miscellaneous operations on @p fd.
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* The operation in question is determined by @p cmd:
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*
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* - F_SETFD: Set the close-on-exec flag to the value specified
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* by the argument after command (only the least significant
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* bit is used).
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* - F_SETLK and F_SETLKW: used to manage discretionary file locks.
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* The third argument must be a pointer to a struct flock (that
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* may be overwritten by this call).
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*
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* This function returns 0 on success, -1 otherwise.
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*
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* Conformity: None.
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*
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* Supported OS: Windows Vista, Windows XP or Windows 2000
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* Professional.
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*
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* @ingroup Evil
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*/
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EAPI int fcntl(int fd, int cmd, ...);
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#endif /* __EVIL_FCNTL_H__ */
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