diff options
Diffstat (limited to 'wait_pid.c')
-rw-r--r-- | wait_pid.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/wait_pid.c b/wait_pid.c new file mode 100644 index 0000000..d7a7e84 --- /dev/null +++ b/wait_pid.c @@ -0,0 +1,39 @@ +#include <sys/types.h> +#include <sys/wait.h> +#include "error.h" +#include "haswaitp.h" + +#ifdef HASWAITPID + +int wait_pid(wstat,pid) int *wstat; int pid; +{ + int r; + + do + r = waitpid(pid,wstat,0); + while ((r == -1) && (errno == error_intr)); + return r; +} + +#else + +/* XXX untested */ +/* XXX breaks down with more than two children */ +static int oldpid = 0; +static int oldwstat; /* defined if(oldpid) */ + +int wait_pid(wstat,pid) int *wstat; int pid; +{ + int r; + + if (pid == oldpid) { *wstat = oldwstat; oldpid = 0; return pid; } + + do { + r = wait(wstat); + if ((r != pid) && (r != -1)) { oldwstat = *wstat; oldpid = r; continue; } + } + while ((r == -1) && (errno == error_intr)); + return r; +} + +#endif |