Subversion Repositories planix.SVN

/* 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);
}