Invalidating list iterator

Posted by / 15-Feb-2017 01:19

list should be an empty list or a list you do not care about losing its data. If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it will be parsed as an octal number. Description This routine returns 0 iff the first character is one of ‘Yy1Nn0’, or [o O][Nn Ff] for “on” and “off”. Value pointed to by res is updated upon finding a match.

Description list_safe_reset_next is not safe to use in general if the list may be modified concurrently (eg. An exception to this is if the cursor element (pos) is pinned in the list, and list_safe_reset_next is called after re-taking the lock and before completing the current iteration of the loop body. Description Copy the string, or as much of it as fits, into the dest buffer.

NOTE If the return value is greater than size, the resulting bin_buf is NOT valid for Description This function like C99 vsnprintf, but the difference is that vsnprintf gets arguments from stack, and bstr_printf gets arguments from bin_buf which is a binary buffer that generated by vbin_printf. If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it will be parsed as an octal number. It’s geared for use with sysfs input strings, which generally terminate with newlines but are compared against values without newlines. Note there are no guarantees that this function will not be reordered on non x86 architectures, so if you are writing portable code, make sure not to rely on its reordering guarantees.

The return value is the number of characters which would be generated for the given input, excluding the trailing ‘0’, as per ISO C99. Note that nr may be almost arbitrarily large; this function is not restricted to acting on a single-word quantity.

If you want to have the exact number of characters written into buf as return value (not including the trailing ‘0’), use The number base to use. If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it will be parsed as an octal number. Description This operation is non-atomic and can be reordered.

If two examples of this operation race, one can appear to succeed but actually fail. Note the operation is performed atomically with respect to the local CPU, but not other CPUs. KVM relies on this behaviour on x86 for modifying memory that is also accessed from a hypervisor on the same CPU if running in a VM: don’t change this without also updating arch/x86/kernel/kvm.c Description This is defined the same way as the libc and compiler builtin ffs routines, therefore differs in spirit from the other bitops.

The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used to declare an array named ‘name’ of just enough unsigned longs to contain all bit positions from 0 to ‘bits’ - 1.It ensures that their value will not affect the results of any operation.The bitmap operations that return Boolean (bitmap_empty, for example) or scalar (bitmap_weight, for example) results carefully filter out these unused bits from impacting their results.Apply the above specified mapping to src, placing the result in dst, clearing any bits previously set in dst.For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set.

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When writing drivers, you cannot in general use routines which are from the C Library. If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it will be parsed as an octal number. The routine returns the number of characters copied (not including the trailing NUL) or -E2BIG if the destination buffer wasn’t big enough.

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