CONTROL\crashes 调用 getline

Question

当我运行以下代码并键入 control\时，它会生成“Quit (core dumped)”。我什至没有按回车键。我从教程书中获得了这段代码。

我尝试使用 gcc 进行调试，但它是这样做的:(在它运行 getline 的空白行，我正在输入 control\.)

14 bytes_read = getline (&my_string, &nbytes, stdin); (gdb)

Program received signal SIGQUIT, Quit. 0x004011e5 in main () at myfile.c:14 14 bytes_read = getline (&my_string, &nbytes, stdin); (gdb)

...当我单步执行时。

#include <stdio.h>
#include <stdlib.h>
int main()
{
   int bytes_read;
   int nbytes = 100;
   char *my_string;

   puts ("Please enter a line of text.");

   /* These 2 lines are the heart of the program. */

  my_string = (char *) malloc (nbytes + 1);
  bytes_read = getline (&my_string, &nbytes, stdin);

   if (bytes_read == -1)
     {
       puts ("ERROR!");
     }
   else
     {
       puts ("You typed:");
       puts (my_string);
     }

   return 0;
}

我使用命令行“gcc -g myfile.c”。 我在 Cygwwin bash 上

$ uname --all CYGWIN_NT-5.1 LENOVO-3AA1E185 1.7.29(0.272/5/3) 2014-04-07 13:44 i686 Cygwin

$ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-cygwin/4.8.2/lto-wrapper.exe Target: i686-pc-cygwin Configured with: /cygdrive/i/szsz/tmpp/gcc4/gcc-4.8.2-2/src/gcc-4.8.2/configure --srcdir=/cygdrive/i/szsz/tmpp/gcc4/gcc-4.8.2-2/src/gcc-4.8.2 --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C --build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --disable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic --disable-sjlj-exceptions --enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-libada --enable-libjava --enable-libgcj-sublibs --disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --with-system-zlib --libexecdir=/usr/lib Thread model: posix gcc version 4.8.2 (GCC)

在 cygwin 下是 Microsoft Windows XP Professional 32-bit SP3

Answer 1

Control-C 是大多数系统上的退出信号触发器:

The SIGQUIT signal is similar to SIGINT, except that it's controlled by a different key—the QUIT character, usually C-\—and produces a core dump when it terminates the process, just like a program error signal. You can think of this as a program error condition “detected” by the user.

quoted from GNU .所以这种行为是意料之中的:你的程序确实收到了 SIGQUIT 信号