Question

This question already has answers here:

struct sigaction incomplete error (2 answers)

Closed 9 years ago.

I m 撰写必须处理信号的炮弹。我的相关信号处理相关守则如下:

#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 );

串通给我带来了以下警告和错误:

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

谁能告诉我,我为什么会收到这些警告和错误?

Answer 1

如果你在汇编线上删除<代码>-ansi,将进行工作。我怀疑问题在于,在你指定<代码>-ansi时,信号图书馆的目录部分就列入。

如果你真的不希望听从,你还可以在汇编者选择中添加<代码>-D_POSIX_C_SOURCE。

这里简短地讨论了ANSI和gcc特征测试宏观产品。

友情链接