| 1 | #include <sys/types.h> |
| 2 | #include <sys/wait.h> |
| 3 | #include "error.h" |
| 4 | #include "haswaitp.h" |
| 5 | |
| 6 | #ifdef HASWAITPID |
| 7 | |
| 8 | int wait_pid(wstat,pid) int *wstat; int pid; |
| 9 | { |
| 10 | int r; |
| 11 | |
| 12 | do |
| 13 | r = waitpid(pid,wstat,0); |
| 14 | while ((r == -1) && (errno == error_intr)); |
| 15 | return r; |
| 16 | } |
| 17 | |
| 18 | #else |
| 19 | |
| 20 | /* XXX untested */ |
| 21 | /* XXX breaks down with more than two children */ |
| 22 | static int oldpid = 0; |
| 23 | static int oldwstat; /* defined if(oldpid) */ |
| 24 | |
| 25 | int wait_pid(wstat,pid) int *wstat; int pid; |
| 26 | { |
| 27 | int r; |
| 28 | |
| 29 | if (pid == oldpid) { *wstat = oldwstat; oldpid = 0; return pid; } |
| 30 | |
| 31 | do { |
| 32 | r = wait(wstat); |
| 33 | if ((r != pid) && (r != -1)) { oldwstat = *wstat; oldpid = r; continue; } |
| 34 | } |
| 35 | while ((r == -1) && (errno == error_intr)); |
| 36 | return r; |
| 37 | } |
| 38 | |
| 39 | #endif |