glibc庫函數，系統調用API

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     glibc封裝了大部分系統API，我們一般都是使用glibc封裝的介面進行系統調用，碰到一些沒有封裝的介面，可以通過這個

函數syscall 進行系統調用。

 

 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 an10    error code (zero for success).  */11 extern long int syscall (long int __sysno, ...) __THROW;

 

glibc庫函數，系統調用API