| Rev | Author | # | Line |
|---|---|---|---|
| 1 | perry | 1 | BRK |
| 2 | !!!BRK | ||
| 3 | ---- | ||
| 4 | !!NAME | ||
| 5 | |||
| 6 | brk, sbrk - change data segment size | ||
| 7 | !!SYNOPSIS | ||
| 2 | PerryLorier | 8 | __#include <unistd.h>__ |
| 9 | __int brk(void *__''end_data_segment''__);__ | ||
| 10 | __void *sbrk(ptrdiff_t__ ''increment''__);__ | ||
| 1 | perry | 11 | |
| 12 | !!DESCRIPTION | ||
| 2 | PerryLorier | 13 | __brk__ sets the end of the data segment to the value specified by ''end_data_segment'', when that value is reasonable, the system does have enough memory and the process does not exceed its max data size (see |
| 1 | perry | 14 | setrlimit(2)). |
| 15 | |||
| 2 | PerryLorier | 16 | __sbrk__ increments the program's data space by ''increment'' bytes. __sbrk__ isn't a system call, it is just a C library wrapper. Calling __sbrk__ with an increment of 0 can be used to find the current location of |
| 1 | perry | 17 | the program break. |
| 18 | !!RETURN VALUE | ||
| 2 | PerryLorier | 19 | On success, __brk__ returns zero, and __sbrk__ returns a pointer to the start of the new area. On error, -1 is returned, and ''errno'' is set to [ENOMEM]. |
| 1 | perry | 20 | |
| 21 | !!CONFORMING TO | ||
| 22 | |||
| 23 | BSD 4.3 | ||
| 24 | |||
| 2 | PerryLorier | 25 | __brk__ and __sbrk__ are not defined in the C Standard and are deliberately excluded from the POSIX.1 standard (see paragraphs B.1.1.1.3 and B.8.3.3). |
| 1 | perry | 26 | !!SEE ALSO |
| 2 | PerryLorier | 27 | execve(2), getrlimit(2), malloc(3) |
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