-// $Id: getvserverctx.c,v 1.8 2004/06/27 13:02:07 ensc Exp $ --*- c -*--
+// $Id: getvserverctx.c 2596 2007-08-25 16:56:12Z dhozac $ --*- c -*--
// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
//
#include "pathconfig.h"
#include "compat-c99.h"
#include "lib_internal/util.h"
+#include "internal.h"
#include <sys/types.h>
#include <sys/stat.h>
fd = open(pathname, O_RDONLY);
- if (fd==-1 ||
- (len=lseek(fd, 0, SEEK_END))==-1 ||
+ if (fd==-1) return VC_NOCTX;
+ if ((len=lseek(fd, 0, SEEK_END))==-1 ||
(len>50) ||
- (lseek(fd, 0, SEEK_SET)==-1))
+ (lseek(fd, 0, SEEK_SET)==-1)) {
+ close(fd);
return VC_NOCTX;
+ }
{
char buf[len+1];
char *errptr;
xid_t res;
- if (TEMP_FAILURE_RETRY(read(fd, buf, len+1))!=len)
- return VC_NOCTX;
+ if (TEMP_FAILURE_RETRY(read(fd, buf, len+1))!=len) res = VC_NOCTX;
+ else {
+ buf[len] = '\0';
- res = strtol(buf, &errptr, 10);
- if (*errptr!='\0' && *errptr!='\n') return VC_NOCTX;
+ res = strtol(buf, &errptr, 10);
+ if (*errptr!='\0' && *errptr!='\n') res = VC_NOCTX;
+ }
+ close(fd);
return res;
}
}
xid_t
-vc_getVserverCtx(char const *id, vcCfgStyle style, bool honor_static, bool *is_running)
+vc_getVserverCtx(char const *id, vcCfgStyle style, bool honor_static, bool *is_running,
+ vcCtxType type)
{
size_t l1 = strlen(id);
- char buf[sizeof(CONFDIR "//") + l1 + sizeof("/context")];
+ char buf[sizeof(CONFDIR "//") + l1 + sizeof("/ncontext")];
if (style==vcCFG_NONE || style==vcCFG_AUTO)
style = vc_getVserverCfgStyle(id);
memcpy(buf+idx, "/run", 5); // appends '\0' too
res = getCtxFromFile(buf);
- if (is_running) *is_running = res!=VC_NOCTX;
-
+
+ // when context information could be read, we have to verify that
+ // it belongs to a running vserver and the both vservers are
+ // identically
+ if (res!=VC_NOCTX && type == vcCTX_XID) {
+ char *cur_name;
+ struct vc_vx_info info;
+
+ // determine the vserver which is associated with the xid resp. skip
+ // this step when the context does not exist. When checking whether
+ // the context exists, do not rely on the success of
+ // vc_get_vx_info() alone but check 'errno' for ESRCH also. Else,
+ // wrong results will be caused e.g. for xid 1 which will fail with
+ // ENOSYS.
+ cur_name = (vc_get_vx_info(res, &info)!=-1 || errno!=ESRCH ?
+ vc_getVserverByCtx_Internal(res, &style, 0, false) :
+ 0);
+
+ buf[idx] = '\0'; // cut off the '/run' from the vserver name
+
+ res = ((cur_name!=0 &&
+ vc_compareVserverById(buf, vcCFG_RECENT_FULL,
+ cur_name, vcCFG_RECENT_FULL)==0)
+ ? res
+ : VC_NOCTX); // correct the value of 'res'
+
+ free(cur_name);
+
+ if (is_running) // fill 'is_running' information...
+ *is_running = res!=VC_NOCTX;
+ }
+ else if (is_running)
+ *is_running = false;
+
if (res==VC_NOCTX && honor_static) {
- memcpy(buf+idx, "/context", 9); // appends '\0' too
+check_static:
+ switch (type) {
+ case vcCTX_XID:
+ memcpy(buf+idx, "/context", 9); // appends '\0' too
+ break;
+ case vcCTX_NID:
+ memcpy(buf+idx, "/ncontext", 10);
+ break;
+ case vcCTX_TAG:
+ memcpy(buf+idx, "/tag", 5);
+ break;
+ }
res = getCtxFromFile(buf);
+ if (res==VC_NOCTX && type!=vcCTX_XID) {
+ type = vcCTX_XID;
+ goto check_static;
+ }
}
-
+
return res;
}
default : return VC_NOCTX;