SD_BUS_CREDS_NEW_FROM_PID(3sd_bus_creds_new_from_pSD_BUS_CREDS_NEW_FROM_PID(3)
NAME
sd_bus_creds_new_from_pid, sd_bus_creds_get_mask,
sd_bus_creds_get_augmented_mask, sd_bus_creds_ref, sd_bus_creds_unref,
sd_bus_creds_unrefp - Retrieve credentials object for the specified PID
SYNOPSIS
#include <systemd/sd-bus.h>
int sd_bus_creds_new_from_pid(pid_t pid, uint64_t creds_mask,
sd_bus_creds **ret);
uint64_t sd_bus_creds_get_mask(sd_bus_creds *c);
uint64_t sd_bus_creds_get_augmented_mask(sd_bus_creds *c);
sd_bus_creds *sd_bus_creds_ref(sd_bus_creds *c);
sd_bus_creds *sd_bus_creds_unref(sd_bus_creds *c);
void sd_bus_creds_unrefp(sd_bus_creds **c);
SD_BUS_CREDS_PID, SD_BUS_CREDS_PPID, SD_BUS_CREDS_TID,
SD_BUS_CREDS_UID, SD_BUS_CREDS_EUID, SD_BUS_CREDS_SUID,
SD_BUS_CREDS_FSUID, SD_BUS_CREDS_GID, SD_BUS_CREDS_EGID,
SD_BUS_CREDS_SGID, SD_BUS_CREDS_FSGID, SD_BUS_CREDS_SUPPLEMENTARY_GIDS,
SD_BUS_CREDS_COMM, SD_BUS_CREDS_TID_COMM, SD_BUS_CREDS_EXE,
SD_BUS_CREDS_CMDLINE, SD_BUS_CREDS_CGROUP, SD_BUS_CREDS_UNIT,
SD_BUS_CREDS_SLICE, SD_BUS_CREDS_USER_UNIT, SD_BUS_CREDS_USER_SLICE,
SD_BUS_CREDS_SESSION, SD_BUS_CREDS_OWNER_UID,
SD_BUS_CREDS_EFFECTIVE_CAPS, SD_BUS_CREDS_PERMITTED_CAPS,
SD_BUS_CREDS_INHERITABLE_CAPS, SD_BUS_CREDS_BOUNDING_CAPS,
SD_BUS_CREDS_SELINUX_CONTEXT, SD_BUS_CREDS_AUDIT_SESSION_ID,
SD_BUS_CREDS_AUDIT_LOGIN_UID, SD_BUS_CREDS_TTY,
SD_BUS_CREDS_UNIQUE_NAME, SD_BUS_CREDS_WELL_KNOWN_NAMES,
SD_BUS_CREDS_DESCRIPTION, SD_BUS_CREDS_AUGMENT, _SD_BUS_CREDS_ALL
DESCRIPTION
sd_bus_creds_new_from_pid() creates a new credentials object and fills
it with information about the process pid. The pointer to this object
will be stored in the ret pointer. Note that credential objects may
also be created and retrieved via sd_bus_get_name_creds(3),
sd_bus_get_owner_creds(3) and sd_bus_message_get_creds(3).
The information that will be stored is determined by creds_mask. It may
contain a subset of ORed constants SD_BUS_CREDS_PID, SD_BUS_CREDS_PPID,
SD_BUS_CREDS_TID, SD_BUS_CREDS_UID, SD_BUS_CREDS_EUID,
SD_BUS_CREDS_SUID, SD_BUS_CREDS_FSUID, SD_BUS_CREDS_GID,
SD_BUS_CREDS_EGID, SD_BUS_CREDS_SGID, SD_BUS_CREDS_FSGID,
SD_BUS_CREDS_SUPPLEMENTARY_GIDS, SD_BUS_CREDS_COMM,
SD_BUS_CREDS_TID_COMM, SD_BUS_CREDS_EXE, SD_BUS_CREDS_CMDLINE,
SD_BUS_CREDS_CGROUP, SD_BUS_CREDS_UNIT, SD_BUS_CREDS_SLICE,
SD_BUS_CREDS_USER_UNIT, SD_BUS_CREDS_USER_SLICE, SD_BUS_CREDS_SESSION,
SD_BUS_CREDS_OWNER_UID, SD_BUS_CREDS_EFFECTIVE_CAPS,
SD_BUS_CREDS_PERMITTED_CAPS, SD_BUS_CREDS_INHERITABLE_CAPS,
SD_BUS_CREDS_BOUNDING_CAPS, SD_BUS_CREDS_SELINUX_CONTEXT,
SD_BUS_CREDS_AUDIT_SESSION_ID, SD_BUS_CREDS_AUDIT_LOGIN_UID,
SD_BUS_CREDS_TTY, SD_BUS_CREDS_UNIQUE_NAME,
SD_BUS_CREDS_WELL_KNOWN_NAMES, and SD_BUS_CREDS_DESCRIPTION. Use the
special value _SD_BUS_CREDS_ALL to request all supported fields. The
SD_BUS_CREDS_AUGMENT constant may not be ORed into the mask for
invocations of sd_bus_creds_new_from_pid().
Fields can be retrieved from the credentials object using
sd_bus_creds_get_pid(3) and other functions which correspond directly
to the constants listed above.
A mask of fields which were actually successfully retrieved can be
retrieved with sd_bus_creds_get_mask(). If the credentials object was
created with sd_bus_creds_new_from_pid(), this will be a subset of
fields requested in creds_mask.
Similar to sd_bus_creds_get_mask(), the function
sd_bus_creds_get_augmented_mask() returns a bitmask of field constants.
The mask indicates which credential fields have been retrieved in a
non-atomic fashion. For credential objects created via
sd_bus_creds_new_from_pid(), this mask will be identical to the mask
returned by sd_bus_creds_get_mask(). However, for credential objects
retrieved via sd_bus_get_name_creds(), this mask will be set for the
credential fields that could not be determined atomically at peer
connection time, and which were later added by reading augmenting
credential data from /proc/. Similarly, for credential objects
retrieved via sd_bus_get_owner_creds(), the mask is set for the fields
that could not be determined atomically at bus creation time, but have
been augmented. Similarly, for credential objects retrieved via
sd_bus_message_get_creds(), the mask is set for the fields that could
not be determined atomically at message sending time, but have been
augmented. The mask returned by sd_bus_creds_get_augmented_mask() is
always a subset of (or identical to) the mask returned by
sd_bus_creds_get_mask() for the same object. The latter call hence
returns all credential fields available in the credential object, the
former then marks the subset of those that have been augmented. Note
that augmented fields are unsuitable for authorization decisions, as
they may be retrieved at different times, thus being subject to races.
Hence, augmented fields should be used exclusively for informational
purposes.
sd_bus_creds_ref() creates a new reference to the credentials object c.
This object will not be destroyed until sd_bus_creds_unref() has been
called as many times plus once more. Once the reference count has
dropped to zero, c cannot be used anymore, so further calls to
sd_bus_creds_ref(c) or sd_bus_creds_unref(c) are illegal.
sd_bus_creds_unref() destroys a reference to c.
sd_bus_creds_unrefp() is similar to sd_bus_creds_unref() but takes a
pointer to a pointer to an sd_bus_creds object. This call is useful in
conjunction with GCC's and LLVM's Clean-up Variable Attribute[1]. Note
that this function is defined as inline function.
sd_bus_creds_ref(), sd_bus_creds_unref() and sd_bus_creds_unrefp()
execute no operation if the passed in bus credentials object is NULL.
RETURN VALUE
On success, sd_bus_creds_new_from_pid() returns 0 or a positive
integer. On failure, it returns a negative errno-style error code.
sd_bus_creds_get_mask() returns the mask of successfully acquired
fields.
sd_bus_creds_get_augmented_mask() returns the mask of fields that have
been augmented from data in /proc/, and are thus not suitable for
authorization decisions.
sd_bus_creds_ref() always returns the argument.
sd_bus_creds_unref() always returns NULL.
REFERENCE OWNERSHIP
Function sd_bus_creds_new_from_pid() creates a new object and the
caller owns the sole reference. When not needed anymore, this reference
should be destroyed with sd_bus_creds_unref(3).
Errors
Returned errors may indicate the following problems:
-ESRCH
Specified pid could not be found.
-EINVAL
Specified parameter is invalid (NULL in case of output parameters).
-ENOMEM
Memory allocation failed.
-EOPNOTSUPP
One of the requested fields is unknown to the local system.
NOTES
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
SEE ALSO
systemd(1), sd-bus(3), sd_bus_creds_get_pid(3),
sd_bus_get_name_creds(3), sd_bus_get_owner_creds(3),
sd_bus_message_get_creds(3)
NOTES
1. Clean-up Variable Attribute
https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html
systemd 247 SD_BUS_CREDS_NEW_FROM_PID(3)
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