minix/lib/libsys/getepinfo.c
David van Moolenbroek 24ec0d73b5 Clean up interface to PM and VFS
- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565
2014-03-01 09:05:01 +01:00

75 lines
1.1 KiB
C

#include "syslib.h"
#include <string.h>
#include <unistd.h>
#include <sys/ucred.h>
static pid_t
getepinfo(endpoint_t proc_ep, uid_t *uid, gid_t *gid)
{
message m;
int r;
memset(&m, 0, sizeof(m));
m.PM_GETEPINFO_ENDPT = proc_ep;
if ((r = _taskcall(PM_PROC_NR, PM_GETEPINFO, &m)) < 0)
return r;
if (uid != NULL)
*uid = m.PM_GETEPINFO_UID;
if (gid != NULL)
*gid = m.PM_GETEPINFO_GID;
return (pid_t) r;
}
pid_t
getnpid(endpoint_t proc_ep)
{
return getepinfo(proc_ep, NULL, NULL);
}
uid_t
getnuid(endpoint_t proc_ep)
{
uid_t uid;
int r;
if ((r = getepinfo(proc_ep, &uid, NULL)) < 0)
return (uid_t) r;
return uid;
}
gid_t
getngid(endpoint_t proc_ep)
{
gid_t gid;
int r;
if ((r = getepinfo(proc_ep, NULL, &gid)) < 0)
return (gid_t) r;
return gid;
}
int
getnucred(endpoint_t proc_ep, struct uucred *ucred)
{
uid_t uid;
gid_t gid;
int r;
if (ucred == NULL)
return EFAULT;
if ((r = getepinfo(proc_ep, &uid, &gid)) < 0)
return r;
/* Only two fields are used for now; ensure the rest is zeroed out. */
memset(ucred, 0, sizeof(struct uucred));
ucred->cr_uid = uid;
ucred->cr_gid = gid;
return r;
}