Computers and Technology, 05.05.2020 22:36 genyjoannerubiera
The iOS _MALLOC(size_t size, int type, int flags) function allocates size bytes on the heap. Internally blocks are represented as a length field followed by a data field:
struct _mhead {
size_t mlen;
char dat[0]; }
The mlen field is used by the free() function to determine how much space needs to be freed. In iOS 4.x the _MALLOC function was implemented as follows:
1 void * _MALLOC(size_t size, int type, int flags) {
2 struct _mhead *hdr;
3 size_t memsize = sizeof (*hdr) + size;
4 hdr = (void *)kalloc(memsize); // allocate memory
5 hdr->mlen = memsize;
6 return (hdr->dat);
7 }
In iOS 5.x the following two lines were added after line 3:
int o = memsize < size ? 1 : 0;
if (o) return (NULL);
Why were these lines added in iOS5.x? Briefly describe an attack that may be possible without these lines.
Answers: 3
Computers and Technology, 22.06.2019 14:30, qxchung7310
The “rule of 72” is used to approximate the time required for prices to double due to inflation. if the inflation rate is r%, then the rule of 72 estimates that prices will double in 72/r years. for instance, at an inflation rate of 6%, prices double in about 72/6 or 12 years. write a program to test the accuracy of this rule. for each interest rate from 1% to 20%, the program should display the rounded value of 72/r and the actual number of years required for prices to double at an r% inflation rate. (assume prices increase at the end of each year.)
Answers: 1
Computers and Technology, 24.06.2019 11:00, zeesharpe05
These statements describe lists in presentation programs: a. bullets can be turned off and on. b. bullets cannot be turned off. c. bullet styles, colors, and sizes can be changed. d. lists don't have to use bullets or numbers. e. numbering styles, colors, and sizes can be changed. f. numbers can be turned off and on. g. numbers cannot be turned off. select all that apply
Answers: 2
The iOS _MALLOC(size_t size, int type, int flags) function allocates size bytes on the heap. Interna...
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