Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #81
Difficulty: Easy
AT&T UNIX, SCO UnixWare, Sun Microsystems Solaris, HP-UX, IBM AIX, SGI IRIX and many big corporations who wanted license and profit from their own versions of Unix are not as common today as they were in the 1980s.
True or False?
Linux & Unix Commands - Search Man Pages

lock_may_write(9) [centos man page]

LOCK_MAY_WRITE(9)						   The Linux VFS						 LOCK_MAY_WRITE(9)

NAME
lock_may_write - checks that the region is free of locks SYNOPSIS
int lock_may_write(struct inode * inode, loff_t start, unsigned long len); ARGUMENTS
inode the inode that is being written start the first byte to write len the number of bytes to write DESCRIPTION
Emulates Windows locking requirements. Whole-file mandatory locks (share modes) can prohibit a write and byte-range POSIX locks can prohibit a write if they overlap. N.B. this function is only ever called from knfsd and ownership of locks is never checked. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 LOCK_MAY_WRITE(9)

Check Out this Related Man Page

STRUCT 
UIO_INFO(9) Device drivers infrastructure STRUCT UIO_INFO(9) NAME
struct_uio_info - UIO device capabilities SYNOPSIS
struct uio_info { struct uio_device * uio_dev; const char * name; const char * version; struct uio_mem mem[MAX_UIO_MAPS]; struct uio_port port[MAX_UIO_PORT_REGIONS]; long irq; unsigned long irq_flags; void * priv; irqreturn_t (* handler) (int irq, struct uio_info *dev_info); int (* mmap) (struct uio_info *info, struct vm_area_struct *vma); int (* open) (struct uio_info *info, struct inode *inode); int (* release) (struct uio_info *info, struct inode *inode); int (* irqcontrol) (struct uio_info *info, s32 irq_on); }; MEMBERS
uio_dev the UIO device this info belongs to name device name version device driver version mem[MAX_UIO_MAPS] list of mappable memory regions, size==0 for end of list port[MAX_UIO_PORT_REGIONS] list of port regions, size==0 for end of list irq interrupt number or UIO_IRQ_CUSTOM irq_flags flags for request_irq priv optional private data handler the device's irq handler mmap mmap operation for this uio device open open operation for this uio device release release operation for this uio device irqcontrol disable/enable irqs when 0/1 is written to /dev/uioX COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT UIO_INFO(9)

Featured Tech Videos