The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
call_usermodehelper_setup – prepare to call a usermode helper Synopsis struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, char **envp, gfp_t gfp_mask, int (*init)(struct subprocess_info *info, struct cred *new), void (*cleanup)(struct subprocess_info *info), void *data); Arguments path path to usermode executable argv arg vector for process envp environment for process gfp_mask gfp mask for memory allocation init an…
call_usermodehelper_exec – start a usermode application Synopsis int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait); Arguments sub_info information about the subprocessa wait wait for the application to finish and return status. when UMH_NO_WAIT don’t wait at all, but you get no useful error back when the program couldn’t be exec’ed. This makes it safe to call from…
call_usermodehelper – prepare and start a usermode application Synopsis int call_usermodehelper(char *path, char **argv, char **envp, int wait); Arguments path path to usermode executable argv arg vector for process envp environment for process wait wait for the application to finish and return status. when UMH_NO_WAIT don’t wait at all, but you get no useful error…
call_netdevice_notifiers – call all network notifier blocks Synopsis int call_netdevice_notifiers(unsigned long val, struct net_device *dev); Arguments val value passed unmodified to notifier function dev net_device pointer passed unmodified to notifier function Description Call all network notifier blocks. Parameters and return value are as for raw_notifier_call_chain. Copyright
cable_is_40wire – 40/80/SATA decider Synopsis int cable_is_40wire(struct ata_port *ap); Arguments ap port to consider Description This function encapsulates the policy for speed management in one place. At the moment we don’t cache the result but there is a good case for setting ap->cbl to the result when we are called with unknown cables (and figuring…
bytes_to_samples – Unit conversion of the size from bytes to samples Synopsis ssize_t bytes_to_samples(struct snd_pcm_runtime * runtime, ssize_t size); Arguments runtime PCM runtime instance size size in bytes Copyright
bytes_to_frames – Unit conversion of the size from bytes to frames Synopsis snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime * runtime, ssize_t size); Arguments runtime PCM runtime instance size size in bytes Copyright
bstr_printf – Format a string from binary arguments and place it in a buffer Synopsis int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf); Arguments buf The buffer to place the result into size The size of the buffer, including the trailing null space fmt The format string to use bin_buf Binary arguments…
bprintf – Parse a format string and place args’ binary value in a buffer Synopsis int bprintf(u32 *bin_buf, size_t size, const char *fmt, …); Arguments bin_buf The buffer to place args’ binary value size The size of the buffer(by words(32bits), not characters) fmt The format string to use … Arguments for the format string Description…
bpf_prog_create_from_user – create an unattached filter from user buffer Synopsis int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, bpf_aux_classic_check_t trans, bool save_orig); Arguments pfp the unattached filter that is created fprog the filter program trans post-classic verifier transformation handler save_orig save classic BPF program Description This function effectively does the same as bpf_prog_create, only that it…
bpf_prog_create – create an unattached filter Synopsis int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); Arguments pfp the unattached filter that is created fprog the filter program Description Create a filter independent of any socket. We first run some sanity checks on it to make sure it does not explode on us later. If an error…
bmap – find a block number in a file Synopsis sector_t bmap(struct inode * inode, sector_t block); Arguments inode inode of file block block to find Description Returns the block number on the device holding the inode that is the disk block number for the block of the file requested. That is, asked for block 4 of inode…
block_invalidatepage – invalidate part or all of a buffer-backed page Synopsis void block_invalidatepage(struct page *page, unsigned int offset, unsigned int length); Arguments page the page which is affected offset start of the range to invalidate length length of the range to invalidate Description block_invalidatepage is called when all or part of the page has become…
blkdev_issue_zeroout – zero-fill a block range Synopsis int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, bool discard); Arguments bdev blockdev to write sector start sector nr_sects number of sectors to write gfp_mask memory allocation flags (for bio_alloc) discard whether to discard the block range Description Zero-fill a block range. If the discard flag…
blkdev_issue_write_same – queue a write same operation Synopsis int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct page *page); Arguments bdev target blockdev sector start sector nr_sects number of sectors to write gfp_mask memory allocation flags (for bio_alloc) page page containing data to write Description Issue a write same request for the sectors…
blkdev_issue_flush – queue a flush Synopsis int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, sector_t *error_sector); Arguments bdev blockdev to issue flush for gfp_mask memory allocation flags (for bio_alloc) error_sector error sector Description Issue a flush for the block device in question. Caller can supply room for storing the error offset in case of a flush error,…
blkdev_issue_discard – queue a discard Synopsis int blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); Arguments bdev blockdev to issue discard for sector start sector nr_sects number of sectors to discard gfp_mask memory allocation flags (for bio_alloc) flags BLKDEV_IFL_* flags to control behaviour Description Issue a discard request for the sectors…
blkdev_get_by_path – open a block device by name Synopsis struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, void *holder); Arguments path path to the block device to open mode FMODE_* mask holder exclusive holder identifier Description Open the blockdevice described by the device file at path. mode and holder are identical to blkdev_get. On success, the…
blkdev_get_by_dev – open a block device by device number Synopsis struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); Arguments dev device number of block device to open mode FMODE_* mask holder exclusive holder identifier Description Open the blockdevice described by device number dev. mode and holder are identical to blkdev_get. Use it ONLY if you…
blkdev_get – open a block device Synopsis int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); Arguments bdev block_device to open mode FMODE_* mask holder exclusive holder identifier Description Open bdev with mode. If mode includes FMODE_EXCL, bdev is open with exclusive access. Specifying FMODE_EXCL with NULLholder is invalid. Exclusive opens may nest for the same…