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mkswap, readahead: stop using fdlength, it is reported to be unreliable

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This commit is contained in:
Denis Vlasenko 2008-01-27 23:41:34 +00:00
parent da42bd5bbe
commit b5c60fc787
3 changed files with 15 additions and 4 deletions
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2
libbb/xfuncs.c
View File

@ -475,6 +475,7 @@ void xsetuid(uid_t uid)
}
// Return how long the file at fd is, if there's any way to determine it.
#ifdef UNUSED
off_t fdlength(int fd)
{
off_t bottom = 0, top = 0, pos;
@ -513,6 +514,7 @@ off_t fdlength(int fd)
return pos + 1;
}
#endif
int bb_putchar(int ch)
{

11
miscutils/readahead.c
View File

@ -22,9 +22,16 @@ int readahead_main(int argc, char **argv)
while (*++argv) {
int fd = open_or_warn(*argv, O_RDONLY);
if (fd >= 0) {
int r = readahead(fd, 0, fdlength(fd));
off_t len;
int r;
/* fdlength was reported to be unreliable - use seek */
len = xlseek(fd, 0, SEEK_END);
xlseek(fd, 0, SEEK_SET);
r = readahead(fd, 0, len);
close(fd);
if (r >= 0) continue;
if (r >= 0)
continue;
}
retval = EXIT_FAILURE;
}

6
util-linux/mkswap.c
View File

@ -64,9 +64,11 @@ int mkswap_main(int argc, char **argv)
// Figure out how big the device is and announce our intentions.
fd = xopen(argv[1], O_RDWR);
len = fdlength(fd);
/* fdlength was reported to be unreliable - use seek */
len = xlseek(fd, 0, SEEK_END);
xlseek(fd, 0, SEEK_SET);
pagesize = getpagesize();
printf("Setting up swapspace version 1, size = %"OFF_FMT"d bytes\n",
printf("Setting up swapspace version 1, size = %"OFF_FMT"u bytes\n",
len - pagesize);
mkswap_selinux_setcontext(fd, argv[1]);