Return to shmop.c CVS log

Up to [MW Coherent from dump] / coherent / b / lib / libc / sys / i8086

Annotation of coherent/b/lib/libc/sys/i8086/shmop.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * (User) Shared Memory Control Functions
                      3:  *
                      4:  *     Note: shmget() must be first function called.
                      5:  *
                      6:  * $Log:$
                      7:  * 87/04/26    Allan Cornish
                      8:  * Support for 32 bit 'key' added to shmget.
                      9:  */
                     10: 
                     11: #include <sys/shm.h>
                     12: 
                     13: int  shmfd   = -1;
                     14: static char shmdev[] = "/dev/shm";
                     15: 
                     16: /*
                     17:  * Shared Memory Control Operations.
                     18:  */
                     19: 
                     20: shmctl( shmid, cmd, buf )
                     21: 
                     22: int shmid;
                     23: int cmd;
                     24: int buf;
                     25: 
                     26: {
                     27:        int parm[4];
                     28: 
                     29:        if ( shmfd < 0 )
                     30:                return -1;
                     31: 
                     32:        parm[0] = -1;
                     33:        parm[1] = shmid;
                     34:        parm[2] = cmd;
                     35:        parm[3] = buf;
                     36: 
                     37:        ioctl( shmfd, SHMCTL, parm );
                     38:        return parm[0];
                     39: }
                     40: 
                     41: /*
                     42:  * Get Shared Memory Segment.
                     43:  */
                     44: 
                     45: shmget( key, size, shmflg )
                     46: 
                     47: key_t key;
                     48: int size;
                     49: int shmflg;
                     50: 
                     51: {
                     52:        int parm[5];
                     53: 
                     54:        if ( shmfd < 0 ) {
                     55: 
                     56:                if ( (shmfd = open(shmdev, 2)) < 0 ) {
                     57: 
                     58:                        perror( shmdev );
                     59:                        return -1;
                     60:                }
                     61:        }
                     62: 
                     63:        parm[0] = -1;
                     64:        parm[1] = key;
                     65:        parm[2] = key >> 16;
                     66:        parm[3] = size;
                     67:        parm[4] = shmflg;
                     68: 
                     69:        ioctl( shmfd, SHMGET, parm );
                     70:        return parm[0];
                     71: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.