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| author | Alejandro Colomar <alx@kernel.org> | 2024-04-26 15:06:49 +0200 |
|---|---|---|
| committer | Alejandro Colomar <alx@kernel.org> | 2024-05-02 01:24:19 +0200 |
| commit | dcde2f70372b49ec43efc5db864c9ff585d0a2dd (patch) | |
| tree | 78b9b7425130e4a5858e4c01a524d802423879ed /man/man3/end.3 | |
| parent | 12aca537ce78a41bbcdaf485209691e10f8002d7 (diff) | |
| download | man-pages-dcde2f70372b49ec43efc5db864c9ff585d0a2dd.tar.gz | |
man/, share/mk/: Move man*/ to man/
This is a scripted change:
$ mkdir man/;
$ mv man* man/;
$ ln -st . man/man*;
$ find share/mk/ -type f \
| xargs grep -l '^MANDIR *:=' \
| xargs sed -i '/^MANDIR *:=/s,$,/man,';
$ find share/mk/dist/ -type f \
| xargs grep -l man \
| xargs sed -i 's,man%,man/%,g';
Link: <https://lore.kernel.org/linux-man/YxcV4h+Xn7cd6+q2@pevik/T/>
Cc: Petr Vorel <pvorel@suse.cz>
Cc: Jakub Wilk <jwilk@jwilk.net>
Cc: Stefan Puiu <stefan.puiu@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
Diffstat (limited to 'man/man3/end.3')
| -rw-r--r-- | man/man3/end.3 | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/man/man3/end.3 b/man/man3/end.3 new file mode 100644 index 0000000000..f0c22ff5d1 --- /dev/null +++ b/man/man3/end.3 @@ -0,0 +1,96 @@ +.\" Copyright (c) 2008, Linux Foundation, written by Michael Kerrisk +.\" <mtk.manpages@gmail.com> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH end 3 (date) "Linux man-pages (unreleased)" +.SH NAME +etext, edata, end \- end of program segments +.SH SYNOPSIS +.nf +.BI extern " etext" ; +.BI extern " edata" ; +.BI extern " end" ; +.fi +.SH DESCRIPTION +The addresses of these symbols indicate the end of various program +segments: +.TP +.I etext +This is the first address past the end of the text segment +(the program code). +.TP +.I edata +This is the first address past the end of the +initialized data segment. +.TP +.I end +This is the first address past the end of the +uninitialized data segment (also known as the BSS segment). +.SH STANDARDS +None. +.SH HISTORY +Although these symbols have long been provided on most UNIX systems, +they are not standardized; use with caution. +.SH NOTES +The program must explicitly declare these symbols; +they are not defined in any header file. +.P +On some systems the names of these symbols are preceded by underscores, +thus: +.IR _etext , +.IR _edata , +and +.IR _end . +These symbols are also defined for programs compiled on Linux. +.P +At the start of program execution, +the program break will be somewhere near +.I &end +(perhaps at the start of the following page). +However, the break will change as memory is allocated via +.BR brk (2) +or +.BR malloc (3). +Use +.BR sbrk (2) +with an argument of zero to find the current value of the program break. +.SH EXAMPLES +When run, the program below produces output such as the following: +.P +.in +4n +.EX +.RB "$" " ./a.out" +First address past: + program text (etext) 0x8048568 + initialized data (edata) 0x804a01c + uninitialized data (end) 0x804a024 +.EE +.in +.SS Program source +\& +.\" SRC BEGIN (end.c) +.EX +#include <stdio.h> +#include <stdlib.h> +\& +extern char etext, edata, end; /* The symbols must have some type, + or "gcc \-Wall" complains */ +\& +int +main(void) +{ + printf("First address past:\en"); + printf(" program text (etext) %10p\en", &etext); + printf(" initialized data (edata) %10p\en", &edata); + printf(" uninitialized data (end) %10p\en", &end); +\& + exit(EXIT_SUCCESS); +} +.EE +.\" SRC END +.SH SEE ALSO +.BR objdump (1), +.BR readelf (1), +.BR sbrk (2), +.BR elf (5) |