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在Linux下写socket的程序的时候，如果尝试send到一个disconnected socket上，就会让底层抛出一个SIGPIPE信号。
这个信号的缺省处理方法是退出进程，大多数时候这都不是我们期望的。因此我们需要重载这个信号的处理方法。
调用以下代码，即可安全的屏蔽SIGPIPE：
struct sigaction sa;
sa.sa_handler = SIG_IGN;
sigaction( SIGPIPE, &sa, 0 );
//======================================================================
SIGPIPE
From Wikipedia, the free encyclopedia
Jump to: navigation, searchSIGPIPE Description Write on a pipe with no one to read it
Default action Abnormal termination of the process
SA_SIGINFOmacros
one
On POSIX-compliant platforms, SIGPIPE is the signal raised when a computer program attempts to write to a pipe without a process connected to the other end. The symbolic constant for SIGPIPE is defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms.
Etymology
SIG is a common prefix for signal names. PIPE refers to the Unix pipe.
Description
Unix supports the principle of piping, which allows processes to send data to other processes without the need for creating temporary files. When a pipe is broken, the process writing to it is sent the SIGPIPE signal. The default reaction to this signal for a process is to terminate.
A simple example of piping is the following.
ps l | head
This command, when run on a Unix-like machine (including Linux), returns a list of processes, limited to ten lines.
ps l returns a list of all processes (including those of other users).
head selects the first ten lines.
When ps has written ten lines, head has received all it needs and exits. ps will receive a SIGPIPE when it tries to write the remaining lines, causing it to terminate as well: It is no use writing data that no one will use. It is also possible that the reading process terminates while reading the data. This will also cause SIGPIPE to be sent to the writing process.
One can ignore SIGPIPE (using, for example, the signal system call). In this case, all system calls that would cause SIGPIPE to be sent will return -1 and set errno to EPIPE.
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