1 #include <errno.h> 2 #include <stdarg.h> 3 #include <stdlib.h> 4 #include <unistd.h> 5 #include <string.h> 6 #include "lib.h" 7 #include <sys/stat.h> 8 #include "sys9.h" 9 10 /* 11 * O_NOCTTY has no effect 12 */ 13 int 14 open(const char *path, int flags, ...) 15 { 16 int n; 17 long f; 18 int mode; 19 Fdinfo *fi; 20 va_list va; 21 struct stat sbuf; 22 23 f = flags&O_ACCMODE; 24 if(flags&O_CREAT){ 25 if(access(path, 0) >= 0){ 26 if(flags&O_EXCL){ 27 errno = EEXIST; 28 return -1; 29 }else{ 30 if((flags&O_TRUNC)&&(flags&(O_RDWR|O_WRONLY))) 31 f |= 16; 32 n = _OPEN(path, f); 33 } 34 }else{ 35 va_start(va, flags); 36 mode = va_arg(va, int); 37 va_end(va); 38 n = _CREATE(path, f, mode&0777); 39 } 40 if(n < 0) 41 _syserrno(); 42 }else{ 43 if((flags&O_TRUNC)&&(flags&(O_RDWR|O_WRONLY))) 44 f |= 16; 45 n = _OPEN(path, f); 46 if(n < 0) 47 _syserrno(); 48 } 49 if(n >= 0){ 50 fi = &_fdinfo[n]; 51 fi->flags = FD_ISOPEN; 52 fi->oflags = flags&(O_ACCMODE|O_NONBLOCK|O_APPEND); 53 fi->uid = -2; 54 fi->gid = -2; 55 fi->name = malloc(strlen(path)+1); 56 if(fi->name) 57 strcpy(fi->name, path); 58 if(fi->oflags&O_APPEND) 59 _SEEK(n, 0, 2); 60 } 61 return n; 62 } 63