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  • uspace/lib/posix/fcntl.c

    rec18957a r9b1503e  
    3838#include "fcntl.h"
    3939
    40 #include "libc/unistd.h"
    41 #include "libc/vfs/vfs.h"
    42 #include "errno.h"
    43 
    4440/**
    45  * Performs set of operations on the opened files.
    46  *
    47  * @param fd File descriptor of the opened file.
    48  * @param cmd Operation to carry out.
    49  * @return Non-negative on success. Might have special meaning corresponding
    50  *     to the requested operation.
     41 *
     42 * @param fd
     43 * @param cmd
     44 * @param ...
     45 * @return
    5146 */
    5247int posix_fcntl(int fd, int cmd, ...)
    5348{
    54         int rc;
    55         int flags;
    56 
    57         switch (cmd) {
    58         case F_DUPFD:
    59         case F_DUPFD_CLOEXEC: /* FD_CLOEXEC is not supported. */
    60                 /* VFS does not provide means to express constraints on the new
    61                  * file descriptor so the third argument is ignored. */
    62 
    63                 /* Retrieve node triplet corresponding to the file descriptor. */
    64                 /* Empty statement after label. */;
    65                 fdi_node_t node;
    66                 rc = fd_node(fd, &node);
    67                 if (rc != EOK) {
    68                         errno = -rc;
    69                         return -1;
    70                 }
    71 
    72                 /* Reopen the node so the fresh file descriptor is generated. */
    73                 int newfd = open_node(&node, 0);
    74                 if (newfd < 0) {
    75                         errno = -newfd;
    76                         return -1;
    77                 }
    78 
    79                 /* Associate the newly generated descriptor to the file description
    80                  * of the old file descriptor. Just reopened node will be automatically
    81                  * closed. */
    82                 rc = dup2(fd, newfd);
    83                 if (rc != EOK) {
    84                         errno = -rc;
    85                         return -1;
    86                 }
    87 
    88                 return newfd;
    89         case F_GETFD:
    90                 /* FD_CLOEXEC is not supported. There are no other flags. */
    91                 return 0;
    92         case F_SETFD:
    93                 /* FD_CLOEXEC is not supported. Ignore arguments and report success. */
    94                 return 0;
    95         case F_GETFL:
    96                 /* File status flags (i.e. O_APPEND) are currently private to the
    97                  * VFS server so it cannot be easily retrieved. */
    98                 flags = 0;
    99                 /* File access flags are currently not supported for file descriptors.
    100                  * Provide full access. */
    101                 flags |= O_RDWR;
    102                 return flags;
    103         case F_SETFL:
    104                 /* File access flags are currently not supported for file descriptors.
    105                  * Ignore arguments and report success. */
    106                 return 0;
    107         case F_GETOWN:
    108         case F_SETOWN:
    109         case F_GETLK:
    110         case F_SETLK:
    111         case F_SETLKW:
    112                 /* Signals (SIGURG) and file locks are not supported. */
    113                 errno = ENOTSUP;
    114                 return -1;
    115         default:
    116                 /* Unknown command */
    117                 errno = EINVAL;
    118                 return -1;
    119         }
     49        // TODO
     50        not_implemented();
    12051}
    12152
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