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BRK(2) Linux Programmer's Manual BRK(2)
brk, sbrk - change data segment size
int brk(void *end_data_segment);
void *sbrk(ptrdiff_t increment);
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 setrlimit(2)).
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 the program break.
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.
brk and sbrk are not defined in the C Standard and are deliberately excluded from the
POSIX.1 standard (see paragraphs B.220.127.116.11 and B.8.3.3).
execve(2), getrlimit(2), malloc(3)
Linux 0.99.11 1993-07-21 BRK(2)
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