Codice

308 volume VI os16
Sorgenti della libreria generale 309
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2280023 |// Flags to be set with:
2280024 |// fcntl (fd, F_SETFD, ...);
2280025 |//----------------------------------------------------------------------
2280026 |#define FD_CLOEXEC 1 // Close the file descriptor upon
2280027 | // execution of an exec() family
2280028 | // function.
2280029 |//----------------------------------------------------------------------
2280030 |// Values for type ‘l_type’, used for record locking with ‘fcntl()’.
2280031 |//----------------------------------------------------------------------
2280032 |#define F_RDLCK 0 // Read lock.
2280033 |#define F_WRLCK 1 // Write lock.
2280034 |#define F_UNLCK 2 // Remove lock.
2280035 |//----------------------------------------------------------------------
2280036 |// Flags for file creation, in place of ‘oflag’ parameter for function
2280037 |// ‘open()’.
2280038 |//----------------------------------------------------------------------
2280039 |#define O_CREAT 000010 // Create file if it does not exist.
2280040 |#define O_EXCL 000020 // Exclusive use flag.
2280041 |#define O_NOCTTY 000040 // Do not assign a controlling terminal.
2280042 |#define O_TRUNC 000100 // Truncation flag.
2280043 |//----------------------------------------------------------------------
2280044 |// Flags for the file status, used with ‘open()’ and ‘fcntl()’.
2280045 |//----------------------------------------------------------------------
2280046 |#define O_APPEND 000200 // Write append.
2280047 |#define O_DSYNC 000400 // Synchronized write operations.
2280048 |#define O_NONBLOCK 001000 // Non-blocking mode.
2280049 |#define O_RSYNC 002000 // Synchronized read operations.
2280050 |#define O_SYNC 004000 // Synchronized read and write.
2280051 |//----------------------------------------------------------------------
2280052 |// File access mask selection.
2280053 |//----------------------------------------------------------------------
2280054 |#define O_ACCMODE 000003 // Mask to select the last three bits,
2280055 | // used to specify the main access
2280056 | // modes: read, write and both.
2280057 |//----------------------------------------------------------------------
2280058 |// Main access modes.
2280059 |//----------------------------------------------------------------------
2280060 |#define O_RDONLY 000001 // Read.
2280061 |#define O_WRONLY 000002 // Write.
2280062 |#define O_RDWR (O_RDONLY | O_WRONLY) // Both read and write.
2280063 |//----------------------------------------------------------------------
2280064 |// Structure ‘flock’, used to file lock for POSIX standard. It is not
2280065 |// used inside os16.
2280066 |//----------------------------------------------------------------------
2280067 |struct flock {
2280068 | short int l_type; // Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.
2280069 | short int l_whence; // Start reference point.
2280070 | off_t l_start; // Offset, from ‘l_whence’, for the area start.
2280071 | off_t l_len; // Locked area size. Zero means up to the end of
2280072 | // the file.
2280073 | pid_t l_pid; // The process id blocking the area.
2280074 |};
2280075 |//----------------------------------------------------------------------
2280076 |// Function prototypes.
2280077 |//----------------------------------------------------------------------
2280078 |int creat (const char *path, mode_t mode);
2280079 |int fcntl (int fdn, int cmd, ...);
2280080 |int open (const char *path, int oflags, ...);
2280081 |//----------------------------------------------------------------------
2280082 |
2280083 |#endif
105.4.1 lib/fcntl/creat.c
Si veda la sezione 98.11.
2290001 |#include
2290002 |#include
2290003 |#include
2290004 |//----------------------------------------------------------------------
2290005 |int
2290006 |creat (const char *path, mode_t mode)
2290007 |{
2290008 | return (open (path, O_WRONLY|O_CREAT|O_TRUNC, mode));
2290009 |}
105.4.2 lib/fcntl/fcntl.c
Si veda la sezione 97.13.
2300001 |#include
2300002 |#include
2300003 |#include
2300004 |#include
2300005 |#include
2300006 |#include
2300007 |#include
2300008 |#include
2300009 |//----------------------------------------------------------------------
2300010 |int
2300011 |fcntl (int fdn, int cmd, ...)
2300012 |{
2300013 | va_list ap;
2300014 | sysmsg_fcntl_t msg;
2300015 | va_start (ap, cmd);
2300016 | //
2300017 | // Well known arguments.
2300018 | //
2300019 | msg.fdn = fdn;
2300020 | msg.cmd = cmd;
2300021 | //
2300022 | // Select other arguments.
2300023 | //
2300024 | switch (cmd)
2300025 | {
2300026 | case F_DUPFD:
2300027 | case F_SETFD:
2300028 | case F_SETFL:
2300029 | msg.arg = va_arg (ap, int);
2300030 | break;
2300031 | case F_GETFD:
2300032 | case F_GETFL:
2300033 | break;
2300034 | case F_GETOWN:
2300035 | case F_SETOWN:
2300036 | case F_GETLK:
2300037 | case F_SETLK:
2300038 | case F_SETLKW:
2300039 | errset (E_NOT_IMPLEMENTED); // Not implemented.
2300040 | return (-1);
2300041 | default:
2300042 | errset (EINVAL); // Not implemented.
2300043 | return (NULL);
2300044 | }
2300045 | //
2300046 | // Do the system call.
2300047 | //
2300048 | sys (SYS_FCNTL, &msg, (sizeof msg));
2300049 | errno = msg.errno;
2300050 | errln = msg.errln;
2300051 | strncpy (errfn, msg.errfn, PATH_MAX);
2300052 | return (msg.ret);
2300053 |}
105.4.3 lib/fcntl/open.c
Si veda la sezione 97.28.
2310001 |#include
2310002 |#include
2310003 |#include
2310004 |#include
2310005 |#include
2310006 |#include
2310007 |#include
2310008 |#include
2310009 |//----------------------------------------------------------------------
2310010 |int
2310011 |open (const char *path, int oflags, ...)
2310012 |{
2310013 | va_list ap;
2310014 | sysmsg_open_t msg;
2310015 | va_start (ap, oflags);
2310016 | if (path == NULL || strlen (path) == 0)
2310017 | {
2310018 | errset (EINVAL); // Invalid argument.
2310019 | return (-1);
2310020 | }
2310021 | strncpy (msg.path, path, PATH_MAX);
2310022 | msg.flags = oflags;
2310023 | msg.mode = va_arg (ap, mode_t);
2310024 | sys (SYS_OPEN, &msg, (sizeof msg));
2310025 | errno = msg.errno;
2310026 | errln = msg.errln;
2310027 | strncpy (errfn, msg.errfn, PATH_MAX);
2310028 | return (msg.ret);
2310029 |}
105.5 os16: «lib/grp.h»
Si veda la sezione 101.2.
2320001 |//----------------------------------------------------------------------
2320002 |// os16 does not have a group management!
2320003 |//----------------------------------------------------------------------
2320004 |
2320005 |#ifndef _GRP_H
2320006 |#define _GRP_H 1
2320007 |
2320008 |#include
2320009 |#include
2320010 |#include // gid_t
2320011 |
2320012 |//----------------------------------------------------------------------
2320013 |struct group {
2320014 | char *gr_name;
2320015 | gid_t gr_gid;
2320016 | char **gr_mem;
2320017 |};
2320018 |//----------------------------------------------------------------------
2320019 |struct group *getgrgid (gid_t gid);
2320020 |struct group *getgrnam (const char *name);
2320021 |//----------------------------------------------------------------------
2320022 |
2320023 |#endif
105.5.1 lib/grp/getgrgid.c
Si veda la sezione 101.2.
2330001 |#include
2330002 |#include
2330003 |//----------------------------------------------------------------------
2330004 |struct group *
2330005 |getgrgid (gid_t gid)
2330006 |{
2330007 | static char *name = "none";
2330008 | static struct group grp;
2330009 | //
2330010 | // os16 does not have a group management, so the answare is always
2330011 | // the same.
2330012 | //
2330013 | grp.gr_name = name;
2330014 | grp.gr_gid = (gid_t) -1;
2330015 | grp.gr_mem = NULL;
2330016 | //
2330017 | return (&grp);
2330018 |}
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