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copyinstr(9r)							 copyinstr(9r)

NAME
       copyinstr  -  General:  Copies  a  null-terminated  string  from a user
       address space to a kernel address space

SYNOPSIS
       int copyinstr(
	       char *user_src,
	       char *kernel_dest,
	       int maxlength,
	       int *lencopied );

ARGUMENTS
       Specifies the address in user space of the null-terminated string to be
       copied.	 Specifies the address in kernel space to copy the null-termi‐
       nated string to.	 Specifies the maximum number of bytes to copy.	 Spec‐
       ifies the actual length of the string copied.

DESCRIPTION
       The  copyinstr  routine	copies a specified null-terminated string from
       the unprotected user address space to a specified address in  the  pro‐
       tected kernel address space.

CAUTIONS
       If  the	string	being  copied is not null terminated, copyinstr copies
       maxlength bytes into the kernel address space.

RETURN VALUES
       Upon successful completion, copyinstr returns the value	0  (zero)  and
       the  actual length of the string copied to the lencopied argument. Oth‐
       erwise, it returns one of the  following	 error	constants  defined  in
       /usr/sys/include/sys/errno.h: The address in user space that you speci‐
       fied in the user_src argument cannot be accessed.  The  length  of  the
       string exceeds the maxlength value.

SEE ALSO
       Routines: copyoutstr(9r)

								 copyinstr(9r)

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