A flashing question mark appears when you start your Mac
If you see a flashing question mark when you start your Mac, it's probably because it can't find the system software it needs to start up. Usually, all you have to do to get your Mac back up and running is remind it where its software is. After the flashing question mark appears, one of two things may happen: The computer starts up normally after a brief delay. The computer does not start up.
It appears i cant connect linux VPS server via SSH or i cant SCP any file to it and i cant wget any file TO it (from inside it) while CSF (Config Server Firewall, LFD is running. Just after isntall in default configuration and after changing TESTING mode to LIVE mode.
Trying to wget & install... (1 Reply)
Dear All,
I am trying to run some commands and I am getting question mark in filename as output files.
Which is not a literal question mark however it is not standard output format for UNIX and it can not print it.
The output files are extended with ?
For example,... (2 Replies)
I have a script(ex.sh) with one line in it, running in bash shell.
ls -l > /usr/ngasi/contexts/tdevoe/private/ex.txt
when I run it , it creates the file with a trailing question mark
-rwx------ 1 tdevoe webapp 59 Jun 7 06:42 ex.sh
-rw------- 1 tdevoe webapp 3761 Jun ... (3 Replies)
CACHE(3) BSD Library Functions Manual CACHE(3)NAME
sys_cache_control, sys_icache_invalidate, sys_dcache_flush -- cache control
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <libkern/OSCacheControl.h>
int
sys_cache_control(int function, void *start, size_t len);
void
sys_icache_invalidate(void *start, size_t len);
void
sys_dcache_flush(void *start, size_t len);
DESCRIPTION
These functions operate on every cache line containing one of the len bytes of memory pointed to by start. Normally the operations apply to
every processor in the system, but the exact semantics of these operations is platform dependent. They should be used with caution.
sys_cache_control() performs the operation specified by function. Refer to the header file for a list of currently supported functions.
sys_icache_invalidate() prepares memory for execution, typically by invalidating the instruction cache for the indicated range. This should
be called after writing machine instructions to memory, and before executing them. On IA32 processors this function is a NOP, because their
instruction caches are coherent.
sys_dcache_flush() writes modified data cache lines to main memory, and then invalidates all lines in the range being operated on. It can be
useful when dealing with cache incoherent devices or DMA.
RETURN VALUES
sys_cache_control() returns zero on success, ENOTSUP if function is not valid.
SEE ALSO atomic(3), barrier(3)HISTORY
These functions first appeared in Mac OS 10.5 (Leopard).
Darwin September 21, 2006 Darwin