![]() ![]() So now I know my options and can decide what to for that to all for your help. You can rate examples to help us improve the quality of examples. Returns an integer with the file descriptor. Opens or creates a file, depending on the flags passed to the call. via windows.GetFileTime() and windows.SetFileTime() since many years), but I learned, that in Linux this is only possible with a kernel >= 5.1. These are the top rated real world Golang examples of syscall.Write extracted from open source projects. define POSIXSOURCE define LARGETIMEAPI include int utime64(const char pathname, const struct utimbuf64 newtimes ). fd file descriptor buf pointer to the buffer to write count number of bytes to write open.I had hoped that it would be possible to access 64-bit timestamps in a 32-bit Linux program (in Windows this is easy e.g. Demonstrates how to register a handler for the 'syscall from user mode' exception, drop to the user mode privilege level, and then issue a syscall. ![]() to preserve the timestamp after I copy a file) and fpUtime() can only set timestamps up to 2038 in a 32-bit program, what I tried. And it would not help me much, if I only can read timestamps > 2038, if I cannot set them (e.g. Yor are right, that unsigned values allow years up to 2106 (I've made a lot of tests with various functions to get the timestamp of a file on different filesystems and most of them returned signed 32-bit values, so I forgot to mention this detail when creating this topic).īut this does not solve my problem (it would be a longer story) entirely: if I treat timestamps as unsigned, I loose years before 1970. (then I must decide either to be restricted to 64-bit programs or to give up my for that background Mändle: If I understand you correctly, such a fix will only work on a kernel >= 5.1 - Then it would make now no sense for me to wait. The system call is the fundamental interface between an application and the Linux kernel. I had a look into the sources of unit "baseunix" in FPC 3.2.0 and found: My imagination is, because a 32-bit program obviously can make system calls to a 64-bit OS, that there must exist some kind of "interface" to connect those 2 worlds, but I have no idea how that "works" and if / how it's possible to use this. In this example, the source is /dev/sda1, the target is /path/to/mountpoint. So what I want to know is, if / how it is possible to call the existing 64-bit versions of fpUtime() and fpStat() from a 32-bit program. The mount comand calls the mount system call, which has five arguments. via "TProcess" each time to accomplish this. What I want to avoid is having to call console programs like "touch" and "ls -l" e.g. But for a couple of reasons I would like to use this in a 32-bit program, if possible. In a 64-bit program both functions use 64-bit variables to pass the timestamps and so more then enough years are possible. For a couple of reasons I want some more. The first four examples can be run in TSO/E, batch, They begin with call syscalls 'ON'. In a 32-bit program both functions use 32-bit variables to pass the timestamps and so they are restricted to the years 1901.2038. Examples: Using syscall commands z/OS Using REXX and z/OS UNIX System Services SA23-2283-00 The examples in this chapter are provided to assist you with coding REXX programs that use z/OS UNIXsyscall commands. The purpose of the project is for the reader to practice the design of hierarchical program structures and use stat(), open(), read(), write() system calls for file operations.In unit "baseunix" there are 2 functions fpUtime() and fpStat() to set and get the timestamp of a file. The programming project is to use Linux system calls to implement a C program, which recursively copies a directory to a destination. It shows how to develop a selective file copying program which behaves like a simplified dd utility program of Linux. Based on these, it shows how to use system calls to display and copy files. Then it shows how to use read-write system calls to read-write file contents. Next, it explains the open-close-lseek system calls and file descriptors. Based on the stat information, it develops a ls-like program to display directory contents and file information. It explains the stat system call in detail. ![]() ![]() It explains hard link and symbolic link files. It lists and explains the most commonly used system calls for file operations. It shows how to use system calls for file operations. It explains the role of system calls and the online manual pages of Linux. This chapter covers system calls for file operations. ![]()
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