file kaio_mq_setattr.c was initially added on branch fedora-branch.
[glibc/history.git] / hurd / fopenport.c
blob5dcb5ab30a30ce9fef987bf747e66d990fbcdb02
1 /* Copyright (C) 1994,95,97,2000,01,02 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <hurd.h>
20 #include <stdio.h>
21 #include <fcntl.h>
22 #include <string.h>
24 /* Read up to N chars into BUF from COOKIE.
25 Return how many chars were read, 0 for EOF or -1 for error. */
26 static ssize_t
27 readio (void *cookie, char *buf, size_t n)
29 mach_msg_type_number_t nread;
30 error_t err;
31 char *bufp = buf;
33 nread = n;
34 if (err = __io_read ((io_t) cookie, &bufp, &nread, -1, n))
35 return __hurd_fail (err);
37 if (bufp != buf)
39 memcpy (buf, bufp, nread);
40 __vm_deallocate (__mach_task_self (),
41 (vm_address_t) bufp, (vm_size_t) nread);
44 return nread;
47 /* Write up to N chars from BUF to COOKIE.
48 Return how many chars were written or -1 for error. */
49 static ssize_t
50 writeio (void *cookie, const char *buf, size_t n)
52 mach_msg_type_number_t wrote;
53 error_t err;
55 if (err = __io_write ((io_t) cookie, buf, n, -1, &wrote))
56 return __hurd_fail (err);
58 return wrote;
61 /* Move COOKIE's file position *POS bytes, according to WHENCE.
62 The current file position is stored in *POS.
63 Returns zero if successful, nonzero if not. */
64 static int
65 seekio (void *cookie,
66 #ifdef USE_IN_LIBIO
67 _IO_off64_t *pos,
68 #else
69 fpos_t *pos,
70 #endif
71 int whence)
73 error_t err = __io_seek ((file_t) cookie, *pos, whence, pos);
74 return err ? __hurd_fail (err) : 0;
77 /* Close the file associated with COOKIE.
78 Return 0 for success or -1 for failure. */
79 static int
80 closeio (void *cookie)
82 error_t error = __mach_port_deallocate (__mach_task_self (),
83 (mach_port_t) cookie);
84 if (error)
85 return __hurd_fail (error);
86 return 0;
89 #ifdef USE_IN_LIBIO
90 #include "../libio/libioP.h"
91 #define fopencookie _IO_fopencookie
92 #else
93 #define cookie_io_functions_t __io_functions
94 #endif
95 static const cookie_io_functions_t funcsio =
96 { readio, writeio, seekio, closeio };
99 /* Open a stream on PORT. MODE is as for fopen. */
101 FILE *
102 __fopenport (mach_port_t port, const char *mode)
104 int pflags;
105 int needflags;
106 error_t err;
108 const char *m = mode;
110 switch (*m++)
112 case 'r':
113 needflags = O_READ;
114 break;
115 case 'w':
116 needflags = O_WRITE;
117 break;
118 case 'a':
119 needflags = O_WRITE|O_APPEND;
120 break;
121 default:
122 return NULL;
124 if (m[0] == '+' || (m[0] == 'b' && m[1] == '+'))
125 needflags |= O_RDWR;
127 /* Verify the PORT is valid allows the access MODE specifies. */
129 if (err = __io_get_openmodes (port, &pflags))
130 return __hurd_fail (err), NULL;
132 /* Check the access mode. */
133 if ((pflags & needflags) != needflags)
135 errno = EBADF;
136 return NULL;
139 return fopencookie ((void *) port, mode, funcsio);
141 weak_alias (__fopenport, fopenport)