(gawk.info.gz) Using Internal File Ops

Info Catalog

(gawk.info.gz) Internal File Ops

(gawk.info.gz) Sample Library

 
 Integrating the Extensions
 ..........................
 
    Now that the code is written, it must be possible to add it at
 runtime to the running `gawk' interpreter.  First, the code must be
 compiled.  Assuming that the functions are in a file named
 `filefuncs.c', and IDIR is the location of the `gawk' include files,
 the following steps create a GNU/Linux shared library:
 
      $ gcc -shared -DHAVE_CONFIG_H -c -O -g -IIDIR filefuncs.c
      $ ld -o filefuncs.so -shared filefuncs.o
 
    Once the library exists, it is loaded by calling the `extension'
 built-in function.  This function takes two arguments: the name of the
 library to load and the name of a function to call when the library is
 first loaded. This function adds the new functions to `gawk'.  It
 returns the value returned by the initialization function within the
 shared library:
 
      # file testff.awk
      BEGIN {
          extension("./filefuncs.so", "dlload")
      
          chdir(".")  # no-op
      
          data[1] = 1 # force `data' to be an array
          print "Info for testff.awk"
          ret = stat("testff.awk", data)
          print "ret =", ret
          for (i in data)
              printf "data[\"%s\"] = %s\n", i, data[i]
          print "testff.awk modified:",
              strftime("%m %d %y %H:%M:%S", data["mtime"])
      }
 
    Here are the results of running the program:
 
      $ gawk -f testff.awk
      -| Info for testff.awk
      -| ret = 0
      -| data["blksize"] = 4096
      -| data["mtime"] = 932361936
      -| data["mode"] = 33188
      -| data["type"] = file
      -| data["dev"] = 2065
      -| data["gid"] = 10
      -| data["ino"] = 878597
      -| data["ctime"] = 971431797
      -| data["blocks"] = 2
      -| data["nlink"] = 1
      -| data["name"] = testff.awk
      -| data["atime"] = 971608519
      -| data["pmode"] = -rw-r--r--
      -| data["size"] = 607
      -| data["uid"] = 2076
      -| testff.awk modified: 07 19 99 08:25:36
 

Info Catalog

(gawk.info.gz) Internal File Ops

(gawk.info.gz) Sample Library