sbrk - phpMan

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(intptr_t increment);

DESCRIPTION
       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 sys-
       tem 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
       4.3BSD; SUSv1, marked LEGACY in SUSv2, removed in POSIX.1-2001.

       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).

NOTES
       Various  systems  use  various  types for the parameter of sbrk().  Common are int,
       ssize_t, ptrdiff_t, intptr_t.

SEE ALSO
       execve(2), getrlimit(2), malloc(3)



Linux 2.4                         2003-11-01                            BRK(2)

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