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kill and raise Functions

2016-03-05 16:37 507 查看

kill - send signal to a process

#include <sys/types.h>
#include <signal.h>

int kill(pid_t pid, int sig);
//return: 0 if OK, −1 on error

#include <signal.h>

int raise(int sig);
//return: 0 if OK, −1 on error

raise(signo)

等价于

kill(getpid()， signo)


different conditions	解释
pid > 0	The signal is sent to the process whose process ID is pid.
pid == 0	The signal is sent to all processes whose process group ID equals the process group ID of the sender and for which the sender has permission to send the signal. Note that the term all processes excludes an implementation-defined set of system processes. For most UNIX systems, this set of system processes includes the kernel processes and init (pid 1).
pid < 0	The signal is sent to all processes whose process group ID equals the absolute value of pid and for which the sender has permission to send the signal. Again, the set of all processes excludes certain system processes, as described earlier.
pid == −1	The signal is sent to all processes on the system for which the sender has permission to send the signal. As before, the set of processes excludes certain system processes.

signo为0时，kill会执行一般的错误检查，但不发送信号。

用途：用来检查特定的进程是否仍然存在。

如果不存在，

kill

返回-1，

errno

被设置为

ESRCH

进程的存在不是

atomic

原子性的。

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