在 Linux 中使用 signal.h 编译错误
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compile errors using signal.h in Linux
提问by Ataraxia
I'm writing a shell program that must handle signals. My relevant signal handling related code is as follows:
我正在编写一个必须处理信号的 shell 程序。我的相关信号处理相关代码如下：
#include <signal.h>
...
#include <sys/types.h>
...
void installSigactions( int, struct sigaction* );
void handler_function( int signal_id );
...
/*define signal table*/
struct sigaction signal_action;
/*insert handler function*/
signal_action.sa_handler = handler_function;
/*init the flags field*/
signal_action.sa_flags = 0;
/*are no masked interrupts*/
sigemptyset( &signal_action.sa_mask );
/*install the signal_actions*/
sigaction( SIGINT, &signal_action, NULL );
Compiling gives me the following warnings and errors:
编译给了我以下警告和错误：
gcc -Wall -ggdb -ansi -static -pedantic -o os1shell2 os1shell2.c
os1shell2.c:35: warning: 'struct sigaction' declared inside parameter list
os1shell2.c:35: warning: its scope is only this definition or declaration,
which is probably not what you want
os1shell2.c: In function 'main':
os1shell2.c:66: error: storage size of 'signal_action' isn't known
os1shell2.c:75: warning: implicit declaration of function 'sigemptyset'
os1shell2.c:78: warning: implicit declaration of function 'sigaction'
Can anyone tell me why I'm getting these warnings and errors?
谁能告诉我为什么会收到这些警告和错误？
采纳答案by Timothy Jones
It will work if you remove -ansifrom your compile line. I suspect the problem is that the posix parts of the signal library aren't included when you specify -ansi.
如果您-ansi从编译行中删除，它将起作用。我怀疑问题是当您指定-ansi.
If you really don't want to disable -ansi, you can also add -D_POSIX_C_SOURCEto the compiler options.
如果你真的不想禁用-ansi，你也可以添加-D_POSIX_C_SOURCE到编译器选项中。
Here is a short discussion of ANSI and the gcc feature test macros.
回答by paulsm4
Please try moving "sys/types.h" before"signal.h".
请尝试在“signal.h”之前移动“sys/types.h ”。
If that doesn't work, try adding this:
如果这不起作用，请尝试添加以下内容：
#include <bits/sigaction.h>
If it stilldoesn't work, please specify:
如果还是不行，请说明：
1) Your OS and version
1) 您的操作系统和版本
2) Your gcc version
2）你的gcc版本
