File handling

Collaboration diagram for File handling:

Data Structures
struct	file_stat

Enumerations
enum	file_lock_flags { FILE_LOCK_NOWAIT , FILE_LOCK_WAIT }

Functions
void	file_getcwd (struct varbuf *cwd)
	Get the current working directory.
ssize_t	file_readlink (const char *slink, struct varbuf *content, size_t content_len)
	Read the symlink content into a varbuf.
bool	file_is_exec (const char *filename)
	Check whether a filename is executable.
void	file_copy_perms (const char *src, const char *dst)
	Copy file ownership and permissions from one file to another.
int	file_slurp (const char *filename, struct varbuf *vb, struct dpkg_error *err)
bool	file_is_locked (int lockfd, const char *filename)
	Check if a file has a lock acquired.
void	file_lock (int *lockfd, enum file_lock_flags flags, const char *filename, const char *filedesc)
	Lock a file.
void	file_unlock (int fd, const char *filename, const char *filedesc)
	Unlock a previously locked file.
void	file_show (const char *filename)

Detailed Description

Enumeration Type Documentation

file_lock_flags

enum file_lock_flags

Enumerator
FILE_LOCK_NOWAIT
FILE_LOCK_WAIT

Function Documentation

file_copy_perms()

void file_copy_perms	(	const char *	src,
		const char *	dst
	)

Copy file ownership and permissions from one file to another.

Parameters

src	The source filename.
dst	The destination filename.

References _, and ohshite().

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file_getcwd()

void file_getcwd

(

struct varbuf *

cwd

)

Get the current working directory.

References varbuf::buf, varbuf::size, varbuf_grow(), varbuf_reset(), and varbuf_trunc().

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file_is_exec()

bool file_is_exec

(

const char *

filename

)

Check whether a filename is executable.

Parameters

filename

The filename to check.

Referenced by command_in_path().

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file_is_locked()

bool file_is_locked	(	int	lockfd,
		const char *	filename
	)

Check if a file has a lock acquired.

Parameters

lockfd	The file descriptor for the lock.
filename	The file name associated to the file descriptor.

References _, and ohshit().

Referenced by modstatdb_is_locked().

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file_lock()

void file_lock	(	int *	lockfd,
		enum file_lock_flags	flags,
		const char *	filename,
		const char *	desc
	)

Lock a file.

Parameters

lockfd	The pointer to the lock file descriptor. It must be allocated statically as its addresses is passed to a cleanup handler.
flags	The lock flags specifying what type of locking to perform.
filename	The name of the file to lock.
desc	The description of the file to lock.

References _, C_, dpkg_get_pid_execname(), FILE_LOCK_WAIT, ohshit(), ohshite(), push_cleanup(), and setcloexec().

Referenced by modstatdb_lock(), and trigdef_update_start().

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file_readlink()

ssize_t file_readlink	(	const char *	slink,
		struct varbuf *	content,
		size_t	content_len
	)

Read the symlink content into a varbuf.

References varbuf::buf, varbuf::size, varbuf_grow(), varbuf_reset(), and varbuf_trunc().

Referenced by conffderef(), and tarobject().

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file_show()

void file_show

(

const char *

filename

)

References _, fd_fd_copy, internerr, ohshite(), pager_reap(), pager_spawn(), dpkg_error::syserrno, and dpkg_error::type.

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file_slurp()

int file_slurp	(	const char *	filename,
		struct varbuf *	vb,
		struct dpkg_error *	err
	)

References _, dpkg_put_errno(), and varbuf_init().

Referenced by dpkg_get_pid_execname(), ensure_packagefiles_available(), and parse_filehash().

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file_unlock()

void file_unlock	(	int	fd,
		const char *	filename,
		const char *	filedesc
	)

Unlock a previously locked file.

References _, internerr, and ohshite().

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