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Annotation of coherent/b/lib/libc/sys/i386/wait.s, revision 1.1

1.1     ! root        1: //////////
        !             2: / libc/sys/i386/wait.s
        !             3: / wait(), waitpid().
        !             4: / Both are system call #7.
        !             5: / waitpid() is designated by setting all of PSW flags ZF, PF, SF, and OF.
        !             6: //////////
        !             7: 
        !             8:        .text
        !             9:        .globl  wait
        !            10:        .globl  waitpid
        !            11:        .globl  .cerror
        !            12: 
        !            13:        .set    WPMASK,0x8C4    / set (ZF|PF|SF|OF) for waitpid()
        !            14:        
        !            15: //////////
        !            16: / int
        !            17: / wait(int * stat_loc)
        !            18: //////////
        !            19: 
        !            20: wait:
        !            21:        pushfl                  / get psw
        !            22:        popl    %eax
        !            23:        andl    $~WPMASK,%eax   / set PSW for wait()
        !            24:        pushl   %eax
        !            25:        popfl
        !            26:        movl    $7,%eax         / system call # to %eax
        !            27:        lcall   $7,$0
        !            28:        jc      .cerror
        !            29:        movl    4(%esp),%ecx    / get statloc to %ecx
        !            30:        jmp     done            / and do wrap-up
        !            31:        
        !            32: //////////
        !            33: / int
        !            34: / waitpid(pid_t pid, int * stat_loc, int options)
        !            35: //////////
        !            36: 
        !            37: waitpid:
        !            38:        pushfl                  / get psw
        !            39:        popl    %eax
        !            40:        orl     $WPMASK,%eax    / set PSW for waitpid()
        !            41:        pushl   %eax
        !            42:        popfl
        !            43:        movl    $7,%eax         / system call # to %eax
        !            44:        lcall   $7,$0
        !            45:        jc      .cerror
        !            46:        movl    8(%esp),%ecx    / get statloc to %ecx
        !            47: done:
        !            48:        orl     %ecx,%ecx       / is statloc null?
        !            49:        jz      ?L0             / if null, return
        !            50:        movl    %edx,(%ecx)     / if non-null, store thru the pointer
        !            51: ?L0:
        !            52:        ret
        !            53: 
        !            54: / end of libc/sys/i386/wait.s

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