How to check existence of variable in csh Post: 302541042

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LEARN ABOUT OSF1

copyinstr

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-
       terminated string to.  Specifies the maximum number of bytes to copy.  Specifies 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)