# posix_getsid

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_getsid — Get the current sid of the process

### 说明

posix_getsid(int `$process_id`): int|false

Return the session id of the process `process_id`. The session id of a process is the process group id of the session leader.

### 参数

`process_id`

  The process identifier. If set to 0, the current process is assumed. If an invalid `process_id` is specified, then `false` is returned and an error is set which can be checked with posix_get_last_error().

### 返回值

Returns the identifier, as an int, 或者在失败时返回 `false`.

### 示例

示例 #1 Example use of posix_getsid()

`<?php
$pid = posix_getpid();
echo posix_getsid($pid); //8805
?>`

### 参见

- posix_getpgid() - Get process group id for job control
- posix_setsid() - Make the current process a session leader
- POSIX man page GETSID(2)

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