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74bde36e01
* 更改编译器的Include路径，使得include时不需要加`<libc/src/include/>`前缀 * 修改include路径 Co-authored-by: longjin <longjin@RinGoTek.cn>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
#include <signal.h>
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#include <printf.h>
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#include <stddef.h>
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#include <libsystem/syscall.h>
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#pragma GCC push_options
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#pragma GCC optimize("O0")
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void __libc_sa_restorer()
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{
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// 在这里发起sigreturn,请注意，由于内核需要读取到原来的do_signal时保存的栈帧，因此这里不能发生函数调用（会导致函数压栈），只能够这样来完成sigreturn
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__asm__ __volatile__("int $0x80 \n\t" ::"a"(SYS_RT_SIGRETURN) : "memory");
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}
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#pragma GCC pop_options
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/**
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* @brief 设置信号处理动作（简单版本）
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*
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* @param signum
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* @param handler
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* @return int
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*/
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int signal(int signum, __sighandler_t handler)
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{
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struct sigaction sa = {0};
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sa.sa_handler = handler;
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// 由于DragonOS必须由用户程序指定一个sa_restorer，因此这里设置为libc的sa_restorer
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sa.sa_restorer = &__libc_sa_restorer;
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// printf("handler address: %#018lx\n", handler);
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// printf("restorer address: %#018lx\n", &__libc_sa_restorer);
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sigaction(signum, &sa, NULL);
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}
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/**
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* @brief 设置信号处理动作
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*
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* @param signum 信号
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* @param act 处理动作（不可为NULL）
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* @param oldact 返回的旧的处理动作（若为NULL，则不返回）
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* @return int 错误码（遵循posix）
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*/
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int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
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{
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return syscall_invoke(SYS_SIGACTION, (uint64_t)signum, (uint64_t)act, (uint64_t)oldact, 0, 0, 0, 0, 0);
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}
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/**
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* @brief 向当前进程发送一个信号
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*
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* @param sig signal number
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* @return int 错误码
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*/
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int raise(int sig)
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{
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return kill(getpid(), sig);
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}
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/**
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* @brief
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*
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* @param pid 进程的标识符
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* @param sig signal number
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* @return int 错误码
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*/
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int kill(pid_t pid, int sig)
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{
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syscall_invoke(SYS_KILL, pid, sig, 0, 0, 0, 0, 0, 0);
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} |