end - Online Linux Manual PageSection : 3
Updated : 2022-10-30
Source : Linux man-pages 6.03
NAMEetext, edata, end − end of program segments
SYNOPSISextern etext;
extern edata;
extern end;
DESCRIPTIONThe addresses of these symbols indicate the end of various program segments: etext This is the first address past the end of the text segment (the program code). edata This is the first address past the end of the initialized data segment. end This is the first address past the end of the uninitialized data segment (also known as the BSS segment).
STANDARDSAlthough these symbols have long been provided on most UNIX systems, they are not standardized; use with caution.
NOTESThe program must explicitly declare these symbols; they are not defined in any header file. On some systems the names of these symbols are preceded by underscores, thus: _etext, _edata, and _end. These symbols are also defined for programs compiled on Linux. At the start of program execution, the program break will be somewhere near &end (perhaps at the start of the following page). However, the break will change as memory is allocated via brk(2) or malloc(3). Use sbrk(2) with an argument of zero to find the current value of the program break.
EXAMPLESWhen run, the program below produces output such as the following: $ ./a.out
First address past:
program text (etext) 0x8048568
initialized data (edata) 0x804a01c
uninitialized data (end) 0x804a024
Program source #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:\n");
printf(" program text (etext) %10p\n", &etext);
printf(" initialized data (edata) %10p\n", &edata);
printf(" uninitialized data (end) %10p\n", &end);
exit(EXIT_SUCCESS);
}
SEE ALSOobjdump(1), readelf(1), sbrk(2), elf(5) 0
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