Unit Instance

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        "The ioctl interface is quite fragile due to its generality. We have to bear in mind that devices differ between <trademark class=\"registered\">Linux</trademark> and FreeBSD so some care must be applied to do ioctl emulation work right. The ioctl handling is implemented in <filename>linux_ioctl.c</filename>, where <function>linux_ioctl</function> function is defined. This function simply iterates over sets of ioctl handlers to find a handler that implements a given command. The ioctl syscall has three parameters, the file descriptor, command and an argument. The command is a 16-bit number, which in theory is divided into high 8 bits determining class of the ioctl command and low 8 bits, which are the actual command within the given set. The emulation takes advantage of this division. We implement handlers for each set, like <function>sound_handler</function> or <function>disk_handler</function>. Each handler has a maximum command and a minimum command defined, which is used for determining what handler is used. There are slight problems with this approach because <trademark class=\"registered\">Linux</trademark> does not use the set division consistently so sometimes ioctls for a different set are inside a set they should not belong to (SCSI generic ioctls inside cdrom set, etc.). FreeBSD currently does not implement many <trademark class=\"registered\">Linux</trademark> ioctls (compared to NetBSD, for example) but the plan is to port those from NetBSD. The trend is to use <trademark class=\"registered\">Linux</trademark> ioctls even in the native FreeBSD drivers because of the easy porting of applications."
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        "The ioctl interface is quite fragile due to its generality. We have to bear in mind that devices differ between <trademark class=\"registered\">Linux</trademark> and FreeBSD so some care must be applied to do ioctl emulation work right. The ioctl handling is implemented in <filename>linux_ioctl.c</filename>, where <function>linux_ioctl</function> function is defined. This function simply iterates over sets of ioctl handlers to find a handler that implements a given command. The ioctl syscall has three parameters, the file descriptor, command and an argument. The command is a 16-bit number, which in theory is divided into high 8 bits determining class of the ioctl command and low 8 bits, which are the actual command within the given set. The emulation takes advantage of this division. We implement handlers for each set, like <function>sound_handler</function> or <function>disk_handler</function>. Each handler has a maximum command and a minimum command defined, which is used for determining what handler is used. There are slight problems with this approach because <trademark class=\"registered\">Linux</trademark> does not use the set division consistently so sometimes ioctls for a different set are inside a set they should not belong to (SCSI generic ioctls inside cdrom set, etc.). FreeBSD currently does not implement many <trademark class=\"registered\">Linux</trademark> ioctls (compared to NetBSD, for example) but the plan is to port those from NetBSD. The trend is to use <trademark class=\"registered\">Linux</trademark> ioctls even in the native FreeBSD drivers because of the easy porting of applications."
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    "note": "(itstool) path: sect3/para",
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    "timestamp": "2020-04-18T18:14:55.402668Z"
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