a C standard library for fx Casio calculators
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#include <bits/asm/unistd_32.h>
.global _waitpid
.type _waitpid, @function
.align 2
** extern pid_t waitpid(pid_t pid, int *wstatus, int options);
** Wait for a child matching PID to die.
** - If PID is greater than 0, match any process whose process ID is PID.
** - If PID is (pid_t) -1, match any process.
** - If PID is (pid_t) 0, match any process with the same process group as the
** current process.
** - If PID is less than -1, match any process whose process group is the absolute
** value of PID.
** - If the WNOHANG bit is set in OPTIONS, and that child is not already dead,
** return (pid_t) 0. If successful, return PID and store the dead child's
** status in STAT_LOC.
** - Return (pid_t) -1 for errors. If the WUNTRACED bit is set in OPTIONS,
** return status for stopped children; otherwise don't.
trapa #__NR_waitpid