c++ - siginfo 匿名 union 体

Question

我正在尝试获取生成 sigsys 信号的系统调用的地址!但我从 gcc 收到以下错误:

gcc emulator.c -fms-extensions
error: ‘siginfo_t’ has no member named ‘si_call_addr’

我使用的代码是:

static void emulator(int nr, siginfo_t *siginfo, void *void_context)
{
        ucontext_t *ctx = (ucontext_t *)(void_context);
        int syscall;
        char *buf;
        ssize_t bytes;
        size_t len;


        if (siginfo->si_code != SYS_SECCOMP)
                return;
        if (!ctx)
                return;


        syscall = ctx->uc_mcontext.gregs[REG_SYSCALL];
      printf("System call %d ADDR %X\n", syscall,  siginfo->si_call_addr);

        setcontext(ctx);

        return;
}

si_call_addr 在 siginfo_t 中定义为匿名结构。

Answer 1

siginfo_t 中没有 si_call_addr。您可能正在寻找 si_addr 成员。

这是linux提供的siginfo_t:

 siginfo_t {
       int      si_signo;    /* Signal number */
       int      si_errno;    /* An errno value */
       int      si_code;     /* Signal code */
       int      si_trapno;   /* Trap number that caused
                                hardware-generated signal
                                (unused on most architectures) */
       pid_t    si_pid;      /* Sending process ID */
       uid_t    si_uid;      /* Real user ID of sending process */
       int      si_status;   /* Exit value or signal */
       clock_t  si_utime;    /* User time consumed */
       clock_t  si_stime;    /* System time consumed */
       sigval_t si_value;    /* Signal value */
       int      si_int;      /* POSIX.1b signal */
       void    *si_ptr;      /* POSIX.1b signal */
       int      si_overrun;  /* Timer overrun count; POSIX.1b timers */
       int      si_timerid;  /* Timer ID; POSIX.1b timers */
       void    *si_addr;     /* Memory location which caused fault */
       long     si_band;     /* Band event (was int in
                                glibc 2.3.2 and earlier) */
       int      si_fd;       /* File descriptor */
       short    si_addr_lsb; /* Least significant bit of address
                                (since kernel 2.6.32) */
   }