LI71696: UNEXPECTED BEHAVIOUR WITH -D_GNU_SOURCE

Latest updates for XL C/C++ Advanced Edition V7 for Linux

APAR status

• Closed as program error.

Error description

• The test case behaves differently when _GNU_SOURCE is defined.
  Specifically, the bind() routine fails when _GNU_SOURCE is
  defined and works fine when the macro is not defined. The
  problem is it only happens with XL C and not with GCC.
  
  According to the GNU documentation defining _GNU_SOURCE makes
  program use the GNU C library extensions or some other
  non-standard functionality.
  
  
  TESTCASE:
  /* t.c */
  #include <stdio.h>
  #include <sys/socket.h>
  #include <fcntl.h>
  #include <netinet/in.h>
  #include <errno.h>
  
  
  int main()
  {
      int s;
      const int so_reuseaddr         = 1;
      unsigned int nAddr             = 0;
      unsigned short nPort           = 9999;
      struct sockaddr_in  addr;
  
      s = socket(PF_INET, SOCK_STREAM, 0);
      setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char
  *)&so_reuseaddr, sizeof(so_reuseaddr));
      fcntl(s, F_SETFD, 1);
  
      memset(&addr, 0, sizeof(addr));
      addr.sin_addr.s_addr = htonl((unsigned int)nAddr);
      addr.sin_family      = AF_INET;
      addr.sin_port        = htons((unsigned short)nPort);
  
      if (bind(s, (struct sockaddr *)&addr, sizeof(addr))) {
         perror("INVALID_SOCKET");
      }
      else {
         printf("BIND: SUCC\n");
      }
  }
  
  $ xlc t.c -D_GNU_SOURCE  && a.out
  INVALID_SOCKET: Cannot assign requested address
  
  $ gcc t.c -D_GNU_SOURCE  && a.out
  BIND: SUCC
  

Local fix

• N/A
  

Problem summary

• A problem has been identified whereas with the calling
  convention used for the second parameter of the bind function.
  

Problem conclusion

• The calling convention has been corrected to fix the problem.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  LI71216

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XL C/C++ RHEL4

• Fixed component ID

  5724K7720

Applicable component levels

• R701 PSN LI71216

     UP06/09/13