识别导致 strace 挂起的文件
我有一个在 Ubuntu 10.04 上运行的 GTK 程序，该程序以可中断状态挂起，我想了解 strace 的输出。特别是，我有这样一行：
read(5, 0x2ba9ac4, 4096) = -1 EAGAIN (Resource temporarily unavailable)
我怀疑 5 是文件描述符，0x2ba9ac4 是要读取的文件中的地址，4096 是要读取的数据量。你能确认一下吗？更重要的是，如何确定程序正在尝试读取哪个文件？ /proc/pid/fd 中不存在此文件描述符（这可能是程序挂起的原因）。
I have a GTK program running on Ubuntu 10.04 that hangs in interruptible state, and I'd like to understand the output of strace. In particular, I have this line:
read(5, 0x2ba9ac4, 4096) = -1 EAGAIN (Resource temporarily unavailable)
I suspect 5 is the file descriptor, 0x2ba9ac4 the address in this file to be read, and 4096 the amount of data to read. Can you confirm? More importantly, how can one determine which file the program is trying to read? This file descriptor does not exist in /proc/pid/fd (which is probably why the program hangs).
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您可以通过调用
strace -o log -eopen,read yourprogram来查找哪个文件使用该文件描述符。然后在log文件中搜索对感兴趣的read的调用。从这一行（而不是从文件的第一行）开始，向上搜索此文件描述符的第一次出现（通过调用open返回）。例如这里，
open返回的文件描述符是3：You can find which file uses this file descriptor by calling
strace -o log -eopen,read yourprogram. Then search in thelogfile the call toreadof interest. From this line (and not from the first line of the file), search upwards the first occurrence of this file descriptor (returned by a call toopen).For example here, the file descriptor returned by
openis 3:read()的第二个参数只是目标指针，它要求从文件描述符 5 读取，最多 4096 字节。请参阅 read() 的手册页。The second argument to
read()is simply the destination pointer, it's asking for a read from file descriptor 5, and max 4096 bytes. See the manual page forread().添加到 @liberforce 答案，如果进程已经在运行，您可以使用 lsof
形式 strace
现在使用 lsof获取文件名
Adding to @liberforce answer, if the process is already running you can get the file name using lsof
form strace
Now, with lsof