ref: 422f8c3b9f16c330b805b4f6e32d45d9ca7a3694
dir: /sys/man/2/segbrk/
.TH SEGBRK 2 .SH NAME segbrk \- change memory allocation .SH SYNOPSIS .B #include <u.h> .br .B #include <libc.h> .PP .ta \w'\fLvoid* 'u .B void* segbrk(void *saddr, void *addr) .PP .SH DESCRIPTION .I Segbrk sets the system's idea of the lowest unused location of a segment to .I addr rounded up to the next multiple of a page size, typically 4096 bytes. The segment is identified by .I saddr which may be any valid address within the segment. .PP A call to .I segbrk with a zero .I addr argument returns the base address of the segment without altering its size. .PP The system will prevent segments from overlapping and will not allow the length of the text, data, or stack segment to be altered. .SH SOURCE .B /sys/src/libc/9syscall .SH SEE ALSO .IR brk (2), .IR segattach (2), .IR segflush (2) .br .BR /proc/*/segment .SH DIAGNOSTICS Sets .IR errstr . .I Segbrk returns .B (void*)-1 on error. .SH BUGS The .I segbrk system call may go away or be re-implemented to give more general segment control, subsuming the functions of .IR brk (2), .IR segflush (2) and .I segfree in .IR segattach (2).