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@ -94,10 +94,10 @@ https://leetcode.com/problems/swap-salary/description/
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```html
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| id | name | sex | salary |
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|----|------|-----|--------|
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| 1 | A | m | 2500 |
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| 2 | B | f | 1500 |
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| 3 | C | m | 5500 |
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| 4 | D | f | 500 |
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| 1 | A | f | 2500 |
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| 2 | B | m | 1500 |
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| 3 | C | f | 5500 |
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| 4 | D | m | 500 |
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```
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## SQL Schema
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@ -128,7 +128,6 @@ https://leetcode.com/problems/not-boring-movies/description/
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## Description
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邮件地址表:
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```html
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+---------+-----------+--------------+-----------+
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@ -1021,7 +1021,6 @@ $ split [-bl] file PREFIX
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```html
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$ grep [-acinv] [--color=auto] 搜寻字符串 filename
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-a : 将 binary 文件以 text 文件的方式进行搜寻
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-c : 计算找到个数
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-i : 忽略大小写
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-n : 输出行号
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@ -1162,6 +1161,8 @@ daemon 2
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查看占用端口的进程
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示例:查看特定端口的进程
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```
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# netstat -anp | grep port
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```
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@ -1173,10 +1174,10 @@ daemon 2
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| 状态 | 说明 |
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| :---: | --- |
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| R | running or runnable (on run queue) |
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| D | uninterruptible sleep (usually IO) |
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| D | uninterruptible sleep (usually I/O) |
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| S | interruptible sleep (waiting for an event to complete) |
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| Z | defunct/zombie, terminated but not reaped by its parent |
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| T | stopped, either by a job control signal or because it is being traced|
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| T | stopped, either by a job control signal or because it is being traced |
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## SIGCHLD
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@ -1201,7 +1202,7 @@ pid_t wait(int *status)
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如果成功,返回被收集的子进程的进程 ID;如果调用进程没有子进程,调用就会失败,此时返回 - 1,同时 errno 被置为 ECHILD。
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参数 status 用来保存被收集进程退出时的一些状态,如果我们对这个子进程是如何死掉的毫不在意,只想把这个僵尸进程消灭掉,以设定这个参数为 NULL:
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参数 status 用来保存被收集进程退出时的一些状态,如果我们对这个子进程是如何死掉的毫不在意,只想把这个僵死进程消灭掉,以设定这个参数为 NULL:
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```c
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pid = wait(NULL);
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@ -1221,7 +1222,9 @@ options 参数主要有 WNOHANG 和 WUNTRACED 两个选项,WNOHANG 可以使 w
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## 孤儿进程
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一个父进程退出,而它的一个或多个子进程还在运行,那么这些子进程将成为孤儿进程。孤儿进程将被 init 进程(进程号为 1)所收养,并由 init 进程对它们完成状态收集工作。
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一个父进程退出,而它的一个或多个子进程还在运行,那么这些子进程将成为孤儿进程。
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孤儿进程将被 init 进程(进程号为 1)所收养,并由 init 进程对它们完成状态收集工作。
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由于孤儿进程会被 init 进程收养,所以孤儿进程不会对系统造成危害。
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