Date: Tue, 12 Dec 2000 08:55:50 +1030 From: Matthew Thyer <Matthew.Thyer@dsto.defence.gov.au> To: current@freebsd.org Subject: Re: Re: write(2) returns error saying read only filesystem when trying to write to a partition Message-ID: <3A35546E.E4359366@dsto.defence.gov.au> References: <200012080154.eB81sFN00538@mass.osd.bsdi.com> <3A305227.D74011C4@dsto.defence.gov.au> <20001207221408.A29041@dragon.nuxi.com> <3A354E66.A18D5D0B@dsto.defence.gov.au>
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I've been writing to the whole disk OK (since I changed to
/dev/da18), but now I am finding a problem with trying to
seek further into the disk before starting to write.
The code fragment is below and the "lseek(fd, 0L, SEEK_SET)"
works OK but the first "lseek(fd, 8192L, SEEK_CUR)" thereafter
fails with an "Undefined error: 0"
The only way I can get "lseek(fd, X, SEEK_CUR)" to work is where
X = 0.
Any ideas ?
if ( (fd = open("/dev/da18",O_WRONLY)) < 0 ) {
perror("open");
exit(1);
}
/* write alternating 1s and zeros to disk */
for (i = 1; i <= 5; i++) {
/* rewind to start file partition */
if (lseek(fd, 0L, SEEK_SET) != 0) {
perror("lseek seek_set");
exit(1);
}
count = 0L;
/* Now seek up to where we are up to: */
do {
if (lseek(fd, 8192L, SEEK_CUR) != 0) {
perror("lseek seek_cur");
exit(1);
} else ++count;
} while ( count < 1062000 );
--
Matthew Thyer Phone: +61 8 8259 7249
Science Corporate Information Systems Fax: +61 8 8259 5537
Defence Science and Technology Organisation, Salisbury
PO Box 1500 Salisbury South Australia 5108
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