Fcntl () function question. #include "Sys/types.h> #include "Unistd.h> #include "Fcntl.h> #include "Assert.h> #include "Stdlib.h> #include "Stdio.h> Static void error_message (const char *p_error_message); Int main (void) { Int filedes; 4003rd get standard output file description If ((filedes = fcntl (STDOUT_FILENO, F_GETFD, 0)) ====== 1)     { Error_message ( "fcntl error. ");     } Printf ( "filedes = %d\n" filedes); Exit (0); } Static void error_message (const char *p_error_message) { Assert (p_error_message> NULL); Printf ( "%s\n" p_error_message); Exit (1); } =====> Why can not get standard output file description????? Sorry, my read_article_english.cfm is bad:oops : Did not understand what you mean. [ Closed window ]