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如何使用waitpid（）获取子进程的状态？

[英]how to use waitpid() to get the status of child process?

原文 2015-10-06 21:38:24 7 1 c++/ system-calls

Im trying to get the status of child process. 我正在尝试获取子进程的状态。 for example, when I run "adjsafkl" which is a not exist command, the system print "WRONG", but when I run "cp sssa" which the folder is not exist either, but the system will not mark this command as WRONG. 例如，当我运行不存在的命令“ adjsafkl”时，系统将打印“ WRONG”，但是当我运行也不存在该文件夹的“ cp sssa”时，系统将不会将此命令标记为WRONG。 I wonder is there anyway to fix this error? 我不知道是否有解决此错误的方法？

1 个解决方案

You may check for WEXITSTATUS after WIFEXITED: 您可以在WIFEXITED之后检查WEXITSTATUS：

WIFEXITED: returns true if the child terminated normally, that is, by calling exit(3) or _exit(2), or by returning from main(). WIFEXITED：如果子项正常终止（即通过调用exit（3）或_exit（2）或从main（）返回），则返回true。

WEXITSTATUS: returns the exit status of the child. WEXITSTATUS：返回子项的退出状态。 This consists of the least significant 8 bits of the status argument that the child specified in a call to exit(3) or _exit(2) or as the argument for a return statement in main(). 它由状态参数的最低有效8位组成，该状态参数的子级是在调用exit（3）或_exit（2）时指定的，或者是main（）中return语句的参数。 This macro should only be employed if WIFEXITED returned true. 仅当WIFEXITED返回true时才应使用此宏。

Waitpid等待已终止的子进程 - Waitpid waiting on defunct child process

等待执行可执行脚本的子进程 - Waitpid for a child process that execv an unexecutable script

waitPID function 不检查子进程是否退出 - waitPID function not checking if the child process exited

使用waitpid时等待子进程终止 - Wait for child process to terminate when using waitpid

fork（）和waitpid（）不等待子级 - fork() and waitpid() not waiting for child

子进程退出状态的含义 - the meaning for exit status of the child process

僵尸进程未通过 waitpid 调用进行清理 - Zombie process is not cleanup with waitpid call

如何实时获取子进程的标准输出？ - how to get stdout of child process in realtime?

如何获得子进程的切入点？ - How to get the entry point of a child process?

在 C++ 中检查子进程的状态 - Checking the status of a child process in C++

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相关问题 Waitpid等待已终止的子进程 - Waitpid waiting on defunct child process 等待执行可执行脚本的子进程 - Waitpid for a child process that execv an unexecutable script waitPID function 不检查子进程是否退出 - waitPID function not checking if the child process exited 使用waitpid时等待子进程终止 - Wait for child process to terminate when using waitpid fork（）和waitpid（）不等待子级 - fork() and waitpid() not waiting for child 子进程退出状态的含义 - the meaning for exit status of the child process 僵尸进程未通过 waitpid 调用进行清理 - Zombie process is not cleanup with waitpid call 如何实时获取子进程的标准输出？ - how to get stdout of child process in realtime? 如何获得子进程的切入点？ - How to get the entry point of a child process? 在 C++ 中检查子进程的状态 - Checking the status of a child process in C++

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