SEQ_WRITE(9) The Linux VFS SEQ_WRITE(9)NAME
seq_write - write arbitrary data to buffer
SYNOPSIS
int seq_write(struct seq_file * seq, const void * data, size_t len);
ARGUMENTS
seq
seq_file identifying the buffer to which data should be written
data
data address
len
number of bytes
DESCRIPTION
Return 0 on success, non-zero otherwise.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SEQ_WRITE(9)
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COPY(9) BSD Kernel Developer's Manual COPY(9)NAME
copy, copyin, copyinstr, copyout, copystr -- kernel copy functions
SYNOPSIS
#include <sys/types.h>
#include <sys/systm.h>
int
copyin(const void *uaddr, void *kaddr, size_t len);
int
copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done);
int
copyout(const void *kaddr, void *uaddr, size_t len);
int
copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done);
DESCRIPTION
The copy functions are designed to copy contiguous data from one address to another. All but copystr() copy data from user-space to kernel-
space or vice-versa.
The copy routines provide the following functionality:
copyin() Copies len bytes of data from the user-space address uaddr to the kernel-space address kaddr.
copyinstr() Copies a NUL-terminated string, at most len bytes long, from user-space address uaddr to kernel-space address kaddr. The num-
ber of bytes actually copied, including the terminating NUL, is returned in *done.
copyout() Copies len bytes of data from the kernel-space address kaddr to the user-space address uaddr.
copystr() Copies a NUL-terminated string, at most len bytes long, from kernel-space address kfaddr to kernel-space address kdaddr. The
number of bytes actually copied, including the terminating NUL, is returned in *done.
RETURN VALUES
The copy functions return 0 on success or the following error on failure:
[EFAULT] If a bad address is encountered. When this error is returned, the contents of the destination buffer ( *kaddr for
copyin(), copyinstr(), and copystr(); *uaddr for copyout()) are undefined. For copyinstr() and copystr(), the contents of
the *done parameter are also undefined on a return of EFAULT.
In addition to EFAULT, copystr() and copyinstr() on failure will return:
[ENAMETOLONG] When the string is longer than len bytes. On this error return, the destination buffer is not null-terminated, but the
*done parameter is maintained.
SEE ALSO fetch(9), store(9)BSD October 2, 2008 BSD