static sys_return_t
sud_set_common (az_allocid_t allocid, const char *name,
const char *buf, size_t len)
{
char fname[256];
char tmpfname[256];
int rv = 0;
ssize_t sz = 0;
int fd;
snprintf (fname, sizeof(fname)-1, "%s/%ld/%s", SUD_DIR, allocid, name);
snprintf (tmpfname, sizeof(tmpfname)-1, "%s/%ld/%s.tmp", SUD_DIR, allocid, name);
int flags = OPEN_CREATE_FLAGS;
fd = MY_OPEN (tmpfname, flags, 0644);
if (fd < 0) {
int e = errno;
perror ("sud open");
syslog (LOG_ERR, "ERROR: sud open, %d", e);
return SYSERR_NO_PRIVILEGE;
}
sz = fullWrite (fd, buf, len);
if ((size_t)sz != len) {
perror ("sud write");
syslog (LOG_ERR, "ERROR: sud write");
rv = MY_CLOSE (fd);
if (rv < 0) {
perror ("close");
syslog (LOG_ERR, "ERROR: sud close");
}
return SYSERR_NO_PRIVILEGE;
}
rv = MY_CLOSE (fd);
if (rv < 0) {
perror ("sud close");
syslog (LOG_ERR, "ERROR: sud close");
return SYSERR_NO_PRIVILEGE;
}
rv = MY_RENAME (tmpfname, fname);
if (rv < 0) {
perror ("sud rename");
syslog (LOG_ERR, "ERROR: sud rename");
return SYSERR_NO_PRIVILEGE;
}
return SYSERR_NONE;
}
static sys_return_t
sud_get_common (az_allocid_t allocid, const char *name,
char *buf, size_t len, uint64_t expectedRevision)
{
char fname[256];
int rv = 0;
ssize_t sz = 0;
int fd;
int flags;
assert (len >= 8);
snprintf (fname, sizeof(fname)-1, "%s/%ld/%s", SUD_DIR, allocid, name);
flags = OPEN_RDONLY_FLAGS;
fd = MY_OPEN (fname, flags, 0);
if (fd < 0) {
// Handle the normal case of an invalid allocid being requested.
if (errno == ENOENT) {
return SYSERR_NOT_FOUND;
}
// All other errors are catastrophic.
perror ("open");
syslog (LOG_ERR, "ERROR: sud open");
assert (0);
}
// Read in the revision number first.
sz = fullRead (fd, buf, 8);
if (sz != 8) {
perror ("read 1");
syslog (LOG_ERR, "ERROR: sud read 1");
assert (0);
}
uint64_t actualRevision = *((uint64_t *) buf);
if (expectedRevision != actualRevision) {
// This is a normal condition. Return an error and allow the
// caller to try again with a different expectedRevision.
rv = MY_CLOSE (fd);
if (rv < 0) {
perror ("close");
syslog (LOG_ERR, "ERROR: sud close");
}
return SYSERR_INVALID_STATE;
}
// Read the remainder of the record after the revision number.
sz = fullRead (fd, buf+8, len-8);
if ((size_t)sz != (len-8)) {
perror ("read 2");
syslog (LOG_ERR, "ERROR: sud read 2");
assert (0);
}
rv = MY_CLOSE (fd);
if (rv < 0) {
perror ("close");
syslog (LOG_ERR, "ERROR: sud close");
}
return SYSERR_NONE;
}
static inline void __azul_openup(void)
{
if ((__azulfd = MY_OPEN(AZUL_PGROUP_DEV, O_RDWR)) < 0)
__azul_errno = errno;
}
