From: steve.simon@snellwilcox.com
To: 9fans@cse.psu.edu
Subject: [9fans] u9fs: pread pwrite setreuid setregid
Date: Thu, 5 Dec 2002 09:17:15 +0000 [thread overview]
Message-ID: <3736384783@snellwilcox.com> (raw)
[-- Attachment #1: compat.c --]
[-- Type: application/octet-stream, Size: 893 bytes --]
/* compatability layer for u9fs support on CYGWIN */
#include <unistd.h>
#include <errno.h>
ssize_t
pread(int fd, void *p, size_t n, off_t off)
{
off_t ooff;
int oerrno;
if ((ooff = lseek(fd, off, SEEK_SET)) == -1)
return -1;
n = read(fd, p, n);
oerrno = errno;
lseek(fd, ooff, SEEK_SET);
errno = oerrno;
return n;
}
ssize_t
pwrite(int fd, const void *p, size_t n, off_t off)
{
off_t ooff;
int oerrno;
if ((ooff = lseek(fd, off, SEEK_SET)) == -1)
return -1;
n = write(fd, p, n);
oerrno = errno;
lseek(fd, ooff, SEEK_SET);
errno = oerrno;
return n;
}
int
setreuid(int ruid, int euid)
{
if (ruid != -1)
if (setuid(ruid) == -1)
return(-1);
if (euid != -1)
if (seteuid(euid) == -1)
return(-1);
}
int
setregid(int rgid, int egid)
{
if (rgid != -1)
if (setgid(rgid) == -1)
return(-1);
if (egid != -1)
if (setegid(egid) == -1)
return(-1);
}
[-- Attachment #2: Type: text/plain, Size: 379 bytes --]
Hi,
Getting u9fs to compile under CYGWIN and its adged posix interface
I needed a four of shims functions:
ssize_t pread(int fd, void *p, size_t n, off_t off);
ssize_t pwrite(int fd, const void *p, size_t n, off_t off);
int setreuid(int ruid, int euid);
int setregid(int rgid, int egid);
Just in case this is usefull to somone else it is here attached.
-Steve
next reply other threads:[~2002-12-05 9:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-05 9:17 steve.simon [this message]
2002-12-05 10:00 ` Lucio De Re
2002-12-05 15:11 Russ Cox
2002-12-05 15:33 ` Lucio De Re
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