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RedHat 9 (Linux i386) - man page for sbrk (redhat section 2)

BRK(2)					      Linux Programmer's Manual 				       BRK(2)

NAME
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 specified by end_data_segment, when that value is reason- able, 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 paragraphs B.1.1.1.3 and B.8.3.3).
SEE ALSO
execve(2), getrlimit(2), malloc(3) Linux 0.99.11 1993-07-21 BRK(2)


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