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Full Discussion: mysterious #define
Top Forums Programming mysterious #define Post 302118991 by frequency8 on Friday 25th of May 2007 09:29:02 PM
Old 05-25-2007
mysterious #define
in the header file orville.h, outside of the #ifdef #endif , there is the following

#define JOB_CONTROL /* support job-control */

As you can see, the JOB_CONTROL macro has no value associated with it. Here is what I go when I ran grep on the entire source code.

[cda@localhost orville-write-2.55]$ grep -iR JOB_CONTROL ~/orville-write-2.55
/home/cda/orville-write-2.55/orville.h:#define JOB_CONTROL /* support job-control */
/home/cda/orville-write-2.55/wrt_sig.c:#ifdef JOB_CONTROL
/home/cda/orville-write-2.55/wrt_sig.c:#endif /*JOB_CONTROL*/
/home/cda/orville-write-2.55/wrt_sig.c:#ifdef JOB_CONTROL
/home/cda/orville-write-2.55/wrt_sig.c:#endif /*JOB_CONTROL*/
/home/cda/orville-write-2.55/wrt_sig.c:#ifdef JOB_CONTROL
/home/cda/orville-write-2.55/wrt_sig.c:#endif /*JOB_CONTROL*/

in, wrt_sig.c, there is only stuff like this
/* SIGINIT -- Set up the signal handler routines.
*/

void siginit()
{
signal(SIGTERM,(RETSIGTYPE (*)())intr);
signal(SIGINT,(RETSIGTYPE (*)())intr);
signal(SIGHUP,(RETSIGTYPE (*)())intr);
#ifdef JOB_CONTROL
signal(SIGTSTP,(RETSIGTYPE (*)())susp);
#endif /*JOB_CONTROL*/

}

/* SIGOFF -- Turn off all signals the signal handler routines.
*/

void sigoff()
{
signal(SIGINT,SIG_IGN);
signal(SIGQUIT,SIG_IGN);
signal(SIGTERM,SIG_IGN);
#ifdef JOB_CONTROL
signal(SIGTSTP,SIG_IGN);
#endif /*JOB_CONTROL*/
}

So does the OS just assign some value to JOB_CONTROL?
 

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LEARN ABOUT OSX

types

TYPES(5)						      BSD File Formats Manual							  TYPES(5)

NAME

     types -- system data types

SYNOPSIS

     #include <sys/types.h>

DESCRIPTION

     The file sys/types.h contains the defined data types used in the kernel (most are used through out the system).

     #ifndef _TYPES_H_
     #define _TYPES_H_

     typedef short   dev_t;
     #ifndef _POSIX_SOURCE
					     /* major part of a device */
     #define major(x)	     ((int)(((unsigned)(x)>>8)&0377))
					     /* minor part of a device */
     #define minor(x)	     ((int)((x)&0377))
					     /* make a device number */
     #define makedev(x,y)    ((dev_t)(((x)<<8) | (y)))
     #endif

     typedef unsigned char   u_char;
     typedef unsigned short  u_short;
     typedef unsigned int    u_int;
     typedef unsigned long   u_long;
     typedef unsigned short  ushort;	     /* Sys V compatibility */

     #if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE)
     #include <machine/types.h>
     #endif

     #ifdef  _CLOCK_T_
     typedef _CLOCK_T_	     clock_t;
     #undef  _CLOCK_T_
     #endif

     #ifdef  _SIZE_T_
     typedef _SIZE_T_	     size_t;
     #undef  _SIZE_T_
     #endif

     #ifdef  _TIME_T_
     typedef _TIME_T_	     time_t;
     #undef  _TIME_T_
     #endif

     typedef u_int64_t	     u_quad_t;
     typedef int64_t	     quad_t
     typedef quad_t *	     qaddr_t;	     /* should be typedef quad * qaddr_t; */

     typedef long    daddr_t;
     typedef char *  caddr_t;
     #ifdef _DARWIN_FEATURE_64_BIT_INODE
     typedef u_int64_t	     ino_t;
     #else /* !_DARWIN_FEATURE_64_BIT_INODE */
     typedef u_int	     ino_t;
     #endif /* _DARWIN_FEATURE_64_BIT_INODE */
     typedef long    swblk_t;
     typedef long    segsz_t;
     typedef int64_t off_t;
     typedef u_int   uid_t;
     typedef u_int   gid_t;
     typedef int     pid_t;
     typedef u_short nlink_t;
     typedef u_short mode_t;
     typedef u_long  fixpt_t;

     #ifndef _POSIX_SOURCE
     #define NBBY    8		     /* number of bits in a byte */

     /*
      * Select uses bit masks of file descriptors in longs.  These macros
      * manipulate such bit fields (the filesystem macros use chars).
      * FD_SETSIZE may be defined by the user, but the default here should
      * be >= NOFILE (param.h).
      */
     #ifndef FD_SETSIZE
     #define FD_SETSIZE      1024
     #endif

     typedef long    fd_mask;
     #define NFDBITS (sizeof(fd_mask) * NBBY)	     /* bits per mask */

     #ifndef howmany
     #define howmany(x, y)   (((x)+((y)-1))/(y))
     #endif

     typedef struct fd_set {
	     fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
     } fd_set;

     #define FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
     #define FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
     #define FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
     #define FD_COPY(f, t)   bcopy(f, t, sizeof(*(f)))
     #define FD_ZERO(p)      bzero((char *)(p), sizeof(*(p)))

     #endif /* !_POSIX_SOURCE */
     #endif /* !_TYPES_H_ */

SEE ALSO

     adb(1), lseek(2), time(3), fs(5)

HISTORY

     A types file appeared in Version 7 AT&T UNIX.

Darwin								   May 15, 2008 							    Darwin
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