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job_create.md

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zx_job_create

NAME

job_create - create a new job

SYNOPSIS

#include <zircon/syscalls.h>

zx_status_t zx_job_create(zx_handle_t parent_job,
                          uint32_t options,
                          zx_handle_t* out);

DESCRIPTION

zx_job_create() creates a new child job object given a parent job.

Upon success a handle for the new job is returned.

The kernel keeps track of and restricts the "height" of a job, which is its distance from the root job. It is illegal to create a job under a parent whose height exceeds an internal "max height" value. (It is, however, legal to create a process under such a job.)

Job handles may be waited on (TODO(cpu): expand this)

RIGHTS

parent_job must be of type ZX_OBJ_TYPE_JOB and have ZX_RIGHT_MANAGE_JOB.

RETURN VALUE

zx_job_create() returns ZX_OK and a handle to the new job (via out) on success. In the event of failure, a negative error value is returned.

ERRORS

ZX_ERR_BAD_HANDLE parent_job is not a valid handle.

ZX_ERR_WRONG_TYPE parent_job is not a job handle.

ZX_ERR_INVALID_ARGS options is nonzero, or out is an invalid pointer.

ZX_ERR_ACCESS_DENIED parent_job does not have the ZX_RIGHT_WRITE or ZX_RIGHT_MANAGE_JOB right.

ZX_ERR_OUT_OF_RANGE The height of parent_job is too large to create a child job.

ZX_ERR_NO_MEMORY Failure due to lack of memory. There is no good way for userspace to handle this (unlikely) error. In a future build this error will no longer occur.

ZX_ERR_BAD_STATE The parent job object is in the dead state.

SEE ALSO