In Go,The function is used to terminate the program immediately and return a specified exit status code. This status code is usually used to indicate the execution result of the program, 0 indicates success, and a non-zero value indicates an error or an exception.
1. Basic usage
The signature of is as follows:
func Exit(code int)
2. Example
Here is a simple example showing how to use：
package main
import (
"fmt"
"os"
)
func main() {
("Starting the program")
// Simulate an error if true {
("An error occurred. Exiting...")
(1) // Exit with status code 1 }
("This line will not be executed")
}
3. Exit status code
- Status code 0: means success.
- Status Code 1: Usually means a general error.
- Other non-zero status codes: Different status codes can be defined according to the specific error type.
4. Things to note
-
Not executed
defer: CallAfter that, the program will exit immediately and nodeferSentence. Therefore, make sure that the necessary cleanup is completed before the call is called. -
Only valid for the main program：
Applicable to the exit of the main program, theIt will not affect the parent program.
5. Combined with error handling
Usually check for errors after critical operations and decide whether to exit:
package main
import (
"fmt"
"os"
)
func main() {
// Simulate file opening operation _, err := ("non_existent_file.txt")
if err != nil {
("Error:", err)
(1)
}
("File opened successfully")
}
Summarize
is a powerful tool for controlling the exit status of Go applications. Reasonable use can ensure that the program can be terminated in time when an error is encountered and convey information to the caller through the status code.
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