posix

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How to check Stack Usage when Calculating Ackermann

I\'m learning about my system\'s ability to calculate Ackermann\'s algorithm both the two and three parameter version. For very small values of m and n, my system will calculate and print results retu[详细]

2023-04-08 15:21 分类：问答
What happens if printf is not handled

I\'m current supporting some legacy software written aeon ago, compiled in gcc 2.95.3. The program is ran in an SBC, occasionally I had to telnet into it to fix things. I notice that when the SBC is r[详细]

2023-04-08 02:50 分类：问答
Using Memory Mapping or Unlocked Stream Operation?

I am working on a FUSE implementation for FAT32 under Linux (I know this is already available in the Linux Kernel, but this is a school assignment).[详细]

2023-04-07 14:39 分类：问答
Properly running binaries on runtime with safety (seteuid etc)

So if I want to run a binary using exec() on a child process after fork, but want to restrict its file access to a certain directory only, how does one safely do that?[详细]

2023-04-07 11:14 分类：问答
A confusion in APUE2(about symbolic link in UNIX)

The original text is below.It is in Section 4.22 The program in Figure 4.24 changes to a specific directory and then calls getcwd to print the working directory. If we run the program, we get[详细]

2023-04-07 09:43 分类：问答
What Can I Use Besides usleep in a Modern POSIX Environment?

I\'m fairly new to C but writing a small multithreaded application.I want to introduce a delay to a thread.I\'d been using \'usleep\' and the behavior is what I desire - but it generates warnings in C[详细]

2023-04-07 03:02 分类：问答
How and when are shared memory backing files removed in Linux?

I am using the combination of shm_open() and mmap() to create a shared memory segment for IPC. What I\'m wondering is how the backing files (in /dev/shm in my system, Linux kernel 2.6.31) are cleaned[详细]

2023-04-07 02:52 分类：问答
Is this usage of condition variables ALWAYS subject to a lost-signal race?

Suppose a condition variable is used in a situation where the signaling thread modifies the state affecting the truth value of the predicate and calls pthread_cond_signal without holding the mutex ass[详细]

2023-04-06 22:01 分类：问答
Using fork() in C

I\'m writing a program that uses the cpu power to process some information. The program depends on the CPU cores. If there are 2 cores, the program will fork() twice to create 2 instances of the work[详细]

2023-04-05 18:07 分类：问答
How can I determine what stdout "points" to in C?

I want to be able to tell when my program\'s stdout is redirected to a file/device, and when it is left to print normally on the screen. How can this be done in C?[详细]

2023-04-04 17:30 分类：问答