sigaction既可以是结构又可以是函数吗？

发布时间：2020-12-15 21:23:16 所属栏目：安全来源：网络整理

导读：我注意到sigaction被定义为struct和function( http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html)： int sigaction(int,const struct sigaction *restrict,struct sigaction *restrict); 使用它的一个例子是： struct sigaction sa;

我注意到sigaction被定义为struct和function( http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html)：

int sigaction(int,const struct sigaction *restrict,struct sigaction *restrict);

使用它的一个例子是：

struct sigaction sa;

    /* Set up handler */
    sa.sa_flags = SA_SIGINFO|SA_RESTART;
    sa.sa_sigaction = timer_expiry;

    /* Setup signal watchdog */
    if (sigaction(SIG_WDOG,&sa,NULL) == -1) {
       printf("ERROR: Failed to set wdog signal with %s",strerror(errno));
    }

解决方法

C有几个标识符的名称空间;函数标识符和结构标记标识符位于不同的名称空间中.

(C11,6.2.3 Name spaces of identifiers p1) “If more than one declaration of a particular identifier is visible at any point in a
translation unit,the syntactic context disambiguates uses that refer to different entities.
Thus,there are separate name spaces for various categories of identifiers,as follows:

label names (disambiguated by the syntax of the label declaration and use);

the tags of structures,unions,and enumerations (disambiguated by following any32) of the keywords struct,union,or enum);

the members of structures or unions; each structure or union has a separate
name space for its members (disambiguated by the type of the
expression used to access the member via the . or -> operator);

all other identifiers,called ordinary identifiers (declared in ordinary declarators or as enumeration constants)

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