为什么这个编译C，但不是C ++（sigaction的）？ [英] Why does this compile in C but not C++ (sigaction)?

问题描述

试图编译使用G ++下面code时，我得到了以下错误。当我用gcc它工作正常（比一些其他的警告）编译它。任何帮助AP preciated。

  G ++ ush7.cpp
ush7.cpp：在函数'诠释signalsetup（sigaction的*，* sigset_t，无效（*）（INT））：
ush7.cpp：93：错误：'抓'之前的预期不合格-ID
ush7.cpp：95：错误：'抓'之前的预期主要-EX pression
ush7.cpp：95：错误：预期';'之前'抓'
ush7.cpp：97：错误：'抓'之前的预期主要-EX pression
ush7.cpp：97：错误：预期';'之前'抓'
ush7.cpp：100：错误：'抓'之前的预期主要-EX pression
ush7.cpp：100：错误：预期`）抓''之前'
ush7.cpp：108：错误：之前预计'）;令牌
ush7.cpp：108：错误：之前预计'）;令牌
ush7.cpp：在函数'诠释makeargv（为const char *，为const char *，***炭）：
ush7.cpp：137：错误：从'无效*'到'字符*'无效的转换
ush7.cpp：145：错误：从'无效*'无效转换的char **'
 

---

  INT signalsetup（结构的sigaction *闪避，sigset_t *面膜，无效（*处理器）（INT））
{
   结构的sigaction抓;   catch.sa_handler =处理程序; / *设置信号结构* /
   def-＆GT; sa_handler = SIG_DFL;
   catch.sa_flags = 0;
   def-＆GT;其中sa_flags = 0;
   如果（（sigemptyset（及（def-＆GT; sa_mask））== -1）||
       （sigemptyset（及（catch.sa_mask））== -1）||
       （sigaddset（及（catch.sa_mask），SIGINT）== -1）||
       （sigaddset（及（catch.sa_mask），SIGQUIT）== -1）||
       （sigaction的（SIGINT，和放大器;赶，NULL）== -1）||
       （sigaction的（SIGQUIT，＆安培;捕捞，NULL）== -1）||
       （sigemptyset（掩模）==  -  1）||
       （sigaddset（面具，SIGINT）== -1）||
       （sigaddset（掩模，SIGQUIT）==  -  1））
       返回-1;
    返回0;
}
 

解决方案

抓在C ++中，但不是在C关键字。

请参阅我的相关答案C是不是C的真子集++ <一个href=\"http://stackoverflow.com/questions/304088/is-c-$c$c-still-considered-c/304091#304091\">here,甚至更好这里。

I get the following errors when trying to compile the below code using g++. When I compile it using gcc it works fine (other than a few warnings). Any help appreciated.

g++ ush7.cpp
ush7.cpp: In function ‘int signalsetup(sigaction*, sigset_t*, void (*)(int))’:
ush7.cpp:93: error: expected unqualified-id before ‘catch’
ush7.cpp:95: error: expected primary-expression before ‘catch’
ush7.cpp:95: error: expected `;' before ‘catch’
ush7.cpp:97: error: expected primary-expression before ‘catch’
ush7.cpp:97: error: expected `;' before ‘catch’
ush7.cpp:100: error: expected primary-expression before ‘catch’
ush7.cpp:100: error: expected `)' before ‘catch’
ush7.cpp:108: error: expected `)' before ‘;’ token
ush7.cpp:108: error: expected `)' before ‘;’ token
ush7.cpp: In function ‘int makeargv(const char*, const char*, char***)’:
ush7.cpp:137: error: invalid conversion from ‘void*’ to ‘char*’
ush7.cpp:145: error: invalid conversion from ‘void*’ to ‘char**’

---

int signalsetup(struct sigaction *def, sigset_t *mask, void (*handler)(int))
{
   struct sigaction catch;

   catch.sa_handler = handler;  /* Set up signal structures  */
   def->sa_handler = SIG_DFL;
   catch.sa_flags = 0;
   def->sa_flags = 0;
   if ((sigemptyset(&(def->sa_mask)) == -1) ||
       (sigemptyset(&(catch.sa_mask)) == -1) ||
       (sigaddset(&(catch.sa_mask), SIGINT) == -1) ||
       (sigaddset(&(catch.sa_mask), SIGQUIT) == -1) ||
       (sigaction(SIGINT, &catch, NULL) == -1) ||
       (sigaction(SIGQUIT, &catch, NULL) == -1) ||
       (sigemptyset(mask) == -1) ||
       (sigaddset(mask, SIGINT) == -1) ||
       (sigaddset(mask, SIGQUIT) == -1))
       return -1;
    return 0;
}

解决方案

catch is a keyword in C++ but not in C.

Please see my related answer C is not a proper subset of C++ here, or even better here.

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