XOPEN_SOURCE和sigaction

天不再蓝

gcc 版本
gcc version 4.1.1 20070105 (Red Hat 4.1.1-52)

加了XOPEN_SOURCE 之后，就出现编译错误了.  请问下这个是什么原因?

[admin@localhost ~]$ gcc -D_XOPEN_SOURCE sig_tt.c
sig_tt.c:7: error: expected declaration specifiers or '...' before 'siginfo_t'
sig_tt.c: In function 'sig_h':
sig_tt.c:10: error: 'sig_info' undeclared (first use in this function)
sig_tt.c:10: error: (Each undeclared identifier is reported only once
sig_tt.c:10: error: for each function it appears in.)
sig_tt.c: In function 'main':
sig_tt.c:20: error: 'struct sigaction' has no member named 'sa_sigaction'

sig_tt.c
#include <stdio.h>
#include <signal.h>

struct sigaction        old_act;
struct sigaction        new_act;

void sig_h(int sig, siginfo_t* sig_info, void* p)
{
        printf("sig is %d\n", sig);
        printf("si_signo is %d\n", sig_info->si_signo);
        printf("si_code is %d\n", sig_info->si_code);

        sigaction(SIGSEGV, &old_act, NULL);
}

int main()
{
        int*        p = NULL;

        new_act.sa_sigaction = sig_h;
        new_act.sa_flags = SA_SIGINFO;

        sigaction(SIGSEGV, &new_act, &old_act);

        *p = 100;
        return 0;
}

MMMIX

回复 1# 天不再蓝


    去 /usr/include/features.h 中去看看定义这个宏到底是什么意思。

天不再蓝

_XOPEN_SOURCE        Includes POSIX and XPG things.  Set to 500 if
                        Single Unix conformance is wanted, to 600 for the
                        upcoming sixth revision.

改成
gcc -D_XOPEN_SOURCE=600 sig_tt.c -o sig_tt.o

就OK了.