Mercurial > hg > toybox
annotate toys/mkswap.c @ 651:ba40e1852ce8
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| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Sat, 25 Aug 2012 11:51:25 -0500 |
| parents | d51be130fda2 |
| children |
| rev | line source |
|---|---|
| 340 | 1 /* vi: set sw=4 ts=4: |
| 2 * | |
| 3 * mkswap.c - Format swap device. | |
| 4 * | |
| 5 * Copyright 2009 Rob Landley <rob@landley.net> | |
| 6 * | |
| 395 | 7 * Not in SUSv4. |
| 340 | 8 |
|
481
e1b9a8579ddb
mkswap helpstring and argument string
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
395
diff
changeset
|
9 USE_MKSWAP(NEWTOY(mkswap, "<1>1", TOYFLAG_SBIN)) |
| 340 | 10 |
| 11 config MKSWAP | |
| 12 bool "mkswap" | |
| 13 default y | |
| 14 help | |
| 15 usage: mkswap DEVICE | |
| 16 | |
|
481
e1b9a8579ddb
mkswap helpstring and argument string
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
395
diff
changeset
|
17 Sets up a Linux swap area on a device or file. |
| 340 | 18 */ |
| 19 | |
| 20 #include "toys.h" | |
| 21 | |
| 22 void mkswap_main(void) | |
| 23 { | |
|
535
d51be130fda2
More stabs at getting #includes right, and moving off of deprecated functions.
Rob Landley <rob@landley.net>
parents:
481
diff
changeset
|
24 int fd = xopen(*toys.optargs, O_RDWR), pagesize = sysconf(_SC_PAGE_SIZE); |
| 340 | 25 off_t len = fdlength(fd); |
| 26 unsigned int pages = (len/pagesize)-1, *swap = (unsigned int *)toybuf; | |
| 27 | |
| 28 // Write header. Note that older kernel versions checked signature | |
| 29 // on disk (not in cache) during swapon, so sync after writing. | |
| 30 | |
| 31 swap[0] = 1; | |
| 32 swap[1] = pages; | |
| 33 xlseek(fd, 1024, SEEK_SET); | |
| 34 xwrite(fd, swap, 129*sizeof(unsigned int)); | |
| 35 xlseek(fd, pagesize-10, SEEK_SET); | |
| 36 xwrite(fd, "SWAPSPACE2", 10); | |
| 37 fsync(fd); | |
| 38 | |
| 39 if (CFG_TOYBOX_FREE) close(fd); | |
| 40 | |
| 41 printf("Swapspace size: %luk\n", pages*(unsigned long)(pagesize/1024)); | |
| 42 } |