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Server : LiteSpeed System : Linux srv526460274 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 User : kerao9884 ( 1082) PHP Version : 8.0.30 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, Directory : /usr/share/doc/sg3-utils/examples/archive/ |
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/* Code fragment of how to get a buffer from the heap that has a specific
* alignment. The typical alignment is to a "page" whose size is often
* 4096 bytes. */
uint8_t * wrkBuff; /* will get pointer to heap allocation */
uint8_t * wrkPos; /* will get aligned pointer within wrkBuff */
uint32_t sz_of_aligned = 1234; /* number of aligned bytes required */
int psz;
#if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
psz = sysconf(_SC_PAGESIZE); /* POSIX.1 (was getpagesize()) */
#else
psz = 4096; /* give up, pick likely figure */
#endif
/* perhaps use posix_memalign() instead. Yes but not always available */
wrkBuff = (uint8_t *)malloc(sz_of_aligned + psz);
wrkPos = (uint8_t *)(((sg_uintptr_t)wrkBuff + psz - 1) & (~(psz - 1)));
/* The disadvantage of this approach is that it needs both wrkBuff and wrkPos
* to be held by the application. The wrkBuff is only needed for the
* corresponding free(), all other uses should be via wrkPos. */