glibc库函数，系统调用API
2021-03-26 17:27
标签：return img nts nbsp his passing call lib error glibc封装了大部分系统API，我们一般都是使用glibc封装的接口进行系统调用，碰到一些没有封装的接口，可以通过这个 函数syscall 进行系统调用。 glibc库函数，系统调用API 标签：return img nts nbsp his passing call lib error 原文地址：https://www.cnblogs.com/blog-yejy/p/9373850.html
1 /* Invoke `system call‘ number SYSNO, passing it the remaining arguments.
2 This is completely system-dependent, and not often useful.
3
4 In Unix, `syscall‘ sets `errno‘ for all errors and most calls return -1
5 for errors; in many systems you cannot pass arguments or get return
6 values for all system calls (`pipe‘, `fork‘, and `getppid‘ typically
7 among them).
8
9 In Mach, all system calls take normal arguments and always return an
10 error code (zero for success). */
11 extern long int syscall (long int __sysno, ...) __THROW;