kill
Command Function
This command is used to send a signal to a process to terminate the abnormal application.
Syntax
kill [-l [signo]|-s signo|-signo] pid...
Parameters
Table 1 Parameter description
| Parameter | Description | Value Range |
|---|---|---|
| --help | Displays the parameters supported by the kill command. | N/A |
| -l | Lists the names and numbers of signals. | N/A |
| -s | Sends a signal. | N/A |
| signo | Specifies the signal number. | [1, 30] |
| pid | Specifies the process ID. | [1, MAX_INT] |
NOTICE
The value range of signo is [0, 64]. The recommended value range is [1, 30], and other values in the value range are reserved.
Usage Guidelines
-
The signo and pid parameters are mandatory.
-
The pid value range varies depending on the system configuration. For example, if the maximum pid value supported by the system is 256, this value range is [1, 256].
Note
The kill command is not supported by the shell. mksh supports it. To switch to mksh, run cd bin; and ./mksh.
Example
-
Query the process list before killing process 42.
OHOS:/$ ps allCpu(%): 4.67 sys, 195.33 idle PID PPID PGID UID Status VirtualMem ShareMem PhysicalMem CPUUSE10s PName 1 -1 1 0 Pending 0x33b000 0xbb000 0x4db02 0.0 init 2 -1 2 0 Pending 0xdabc08 0 0xdabc08 1.14 KProcess 3 1 3 7 Pending 0x72e000 0x1a3000 0x1d24c2 0.0 foundation 4 1 4 8 Pending 0x362000 0xbb000 0x5c6ff 0.0 bundle_daemon 5 1 5 1 Pending 0xdfa000 0x2e7000 0x1484f0 0.0 appspawn 6 1 6 0 Pending 0x688000 0x137000 0x11bca0 0.0 media_server 7 1 7 0 Pending 0x9d2000 0x103000 0xa1cdf 0.88 wms_server 8 1 8 2 Pending 0x1f5000 0x48000 0x47dc2 0.2 mksh 10 5 5 101 Pending 0x11ec000 0x2f9000 0x206047 0.93 com.example.launcher 12 1 12 0 Pending 0x4d4000 0x112000 0xe0882 0.0 deviceauth_service 13 1 13 0 Pending 0x34f000 0xbd000 0x51799 0.0 sensor_service 14 1 14 2 Pending 0x34e000 0xb3000 0x52184 0.0 ai_server 15 1 15 0 Pending 0x61f000 0x13b000 0x168071 0.45 softbus_server 42 8 42 2 Pending 0x1c1000 0x3a000 0x1106a 0.9 test_demo 43 8 43 2 Running 0x1d7000 0x3a000 0x1e577 0.0 toybox -
Send signal 9 (the default action of SIGKILL is to immediately terminate the process) to process 42 test_demo (a user-mode process). Then, check the current process list. The commands kill -s 9 42 and kill -9 42 have the same effect.
OHOS:/$ kill -s 9 42 OHOS:/$ [1] + Killed ./nfs/test_demo OHOS:/$ ps allCpu(%): 4.73 sys, 195.27 idle PID PPID PGID UID Status VirtualMem ShareMem PhysicalMem CPUUSE10s PName 1 -1 1 0 Pending 0x33b000 0xbb000 0x4e01c 0.0 init 2 -1 2 0 Pending 0xda5fa4 0 0xda5fa4 1.14 KProcess 3 1 3 7 Pending 0x72e000 0x1a3000 0x1d29dc 0.0 foundation 4 1 4 8 Pending 0x362000 0xbb000 0x5cc19 0.0 bundle_daemon 5 1 5 1 Pending 0xdfa000 0x2e7000 0x148a0a 0.0 appspawn 6 1 6 0 Pending 0x688000 0x137000 0x11c1ba 0.0 media_server 7 1 7 0 Pending 0x9d2000 0x103000 0xa21f9 0.89 wms_server 8 1 8 2 Pending 0x1f5000 0x48000 0x482dc 0.2 mksh 10 5 5 101 Pending 0x11ec000 0x2f9000 0x206561 0.93 com.example.launcher 12 1 12 0 Pending 0x4d4000 0x112000 0xe0d9c 0.0 deviceauth_service 13 1 13 0 Pending 0x34f000 0xbd000 0x51cb3 0.0 sensor_service 14 1 14 2 Pending 0x34e000 0xb3000 0x5269e 0.0 ai_server 15 1 15 0 Pending 0x61f000 0x13b000 0x16858b 0.51 softbus_server 45 8 45 2 Running 0x1d7000 0x3a000 0x1e9f5 0.0 toybox -
Run the kill -100 31 command.
Output
The command output is as follows:
Example 1: The signal is successfully sent to process 42.
OHOS:/$ kill -s 9 42
OHOS:/$
[1] + Killed ./nfs/test_demo
Process 42 is killed.
Example 2: The signal fails to be sent to process 31.
OHOS:/$ kill -100 31
kill: Unknown signal '(null)'
Unknown signal '(null)' is displayed because the signo value 100 exceeds the value range [0, 64].
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