brk, sbrk - change data segment size
SYNOPSIS
#include <unistd.h>
int brk(void *end_data_segment);
void *sbrk(ptrdiff_t increment);
DESCRIPTION
brk sets the end of the data segment to the value speci
fied 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.
RETURN VALUE
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.
CONFORMING TO
BSD 4.3
brk and sbrk are not defined in the C Standard and are
deliberately excluded from the POSIX.1 standard (see para
graphs B.1.1.1.3 and B.8.3.3).
SEE ALSO
execve(2), getrlimit(2), malloc(3)
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