Date: Sun, 12 Aug 2001 14:04:06 +0200 From: Bernd Walter <ticso@mail.cicely.de> To: freebsd-hackers@freebsd.org Subject: mtio questions Message-ID: <20010812140406.A7326@cicely20.cicely.de>
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Asume the following code examples:
int fd;
struct mtop mo;
char buf[10240];
fd = open("/dev/nsa0", O_RDWR | O_EXLOCK);
mo.mt_op = MTREW;
mo.mt_count = 0;
ioctl(fd, MTIOCTOP, &mo);
write(fd, buf, 10240);
close(fd);
and:
int fd;
struct mtop mo;
char buf[10240];
fd = open("/dev/nsa0", O_RDWR | O_EXLOCK);
mo.mt_op = MTREW;
mo.mt_count = 0;
ioctl(fd, MTIOCTOP, &mo);
write(fd, buf, 10240);
mo.mt_op = MTWEOF;
mo.mt_count = 1;
ioctl(fd, MTIOCTOP, &mo);
close(fd);
and:
int fd;
struct mtop mo;
char buf[10240];
fd = open("/dev/nsa0", O_RDWR | O_EXLOCK);
mo.mt_op = MTREW;
mo.mt_count = 0;
ioctl(fd, MTIOCTOP, &mo);
write(fd, buf, 10240);
mo.mt_op = MTWEOF;
mo.mt_count = 1;
ioctl(fd, MTIOCTOP, &mo);
mo.mt_op = MTREW;
mo.mt_count = 0;
ioctl(fd, MTIOCTOP, &mo);
close(fd);
The question is what filemark layout will I have on the tape?
If I MTEOD on the tape and write - will I have the same result with
all examples?
May I get into trouble with some tape types that use 2 filemarks EOD
detection?
Ist the result OS dependend?
Another point:
Can we '#define MTEOM MTEOD' as MTEOM is used on NetBSD and Solaris?
--
B.Walter COSMO-Project http://www.cosmo-project.de
ticso@cicely.de Usergroup info@cosmo-project.de
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