diff options
Diffstat (limited to '')
| -rw-r--r-- | user/progTUV.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/user/progTUV.c b/user/progTUV.c deleted file mode 100644 index 8e69a66..0000000 --- a/user/progTUV.c +++ /dev/null @@ -1,167 +0,0 @@ -#include <common.h> - -/** -** User function main #6: exit, fork, exec, kill, waitpid, sleep, write -** -** Reports, then loops spawing userW, sleeps, then waits for or kills -** all its children. -** -** Invoked as: main6 x c b -** where x is the ID character -** c is the child count -** b is wait/kill indicator ('w', 'W', or 'k') -*/ - -#ifndef MAX_CHILDREN -#define MAX_CHILDREN 50 -#endif - -USERMAIN(main) -{ - int count = 3; // default child count - char ch = '6'; // default character to print - int nap = 8; // nap time - bool_t waiting = true; // default is waiting by PID - bool_t bypid = true; - char buf[128]; - uint_t children[MAX_CHILDREN]; - int nkids = 0; - char ch2[] = "*?*"; - - // process the command-line arguments - switch (argc) { - case 4: - waiting = argv[3][0] != 'k'; // 'w'/'W' -> wait, else -> kill - bypid = argv[3][0] != 'w'; // 'W'/'k' -> by PID - // FALL THROUGH - case 3: - count = str2int(argv[2], 10); - // FALL THROUGH - case 2: - ch = argv[1][0]; - break; - default: - sprint(buf, "main6: argc %d, args: ", argc); - cwrites(buf); - for (int i = 0; i <= argc; ++i) { - sprint(buf, " %s", argv[argc] ? argv[argc] : "(null)"); - cwrites(buf); - } - cwrites("\n"); - } - - // fix the secondary output message (for indicating errors) - ch2[1] = ch; - - // announce our presence - write(CHAN_SIO, &ch, 1); - - // set up the argument vector - char *argsw[] = { "userW", "W", "10", "5", NULL }; - - for (int i = 0; i < count; ++i) { - int whom = spawn(ProgW, argsw); - if (whom < 0) { - swrites(ch2); - } else { - children[nkids++] = whom; - } - } - - // let the children start - sleep(SEC_TO_MS(nap)); - - // collect exit status information - - // current child index - int n = 0; - - do { - int this; - int32_t status; - - // are we waiting for or killing it? - if (waiting) { - this = waitpid(bypid ? children[n] : 0, &status); - } else { - // always by PID - this = kill(children[n]); - } - - // what was the result? - if (this < SUCCESS) { - // uh-oh - something went wrong - - // "no children" means we're all done - if (this != E_NO_CHILDREN) { - if (waiting) { - sprint(buf, "!! %c: waitpid(%d) status %d\n", ch, - bypid ? children[n] : 0, this); - } else { - sprint(buf, "!! %c: kill(%d) status %d\n", ch, children[n], - this); - } - } else { - sprint(buf, "!! %c: no children\n", ch); - } - - // regardless, we're outta here - break; - - } else { - // locate the child - int ix = -1; - - // were we looking by PID? - if (bypid) { - // we should have just gotten the one we were looking for - if (this != children[n]) { - // uh-oh - sprint(buf, "** %c: wait/kill PID %d, got %d\n", ch, - children[n], this); - cwrites(buf); - } else { - ix = n; - } - } - - // either not looking by PID, or the lookup failed somehow - if (ix < 0) { - int i; - for (i = 0; i < nkids; ++i) { - if (children[i] == this) { - ix = i; - break; - } - } - } - - // if ix == -1, the PID we received isn't in our list of children - - if (ix < 0) { - // didn't find an entry for this PID??? - sprint(buf, "!! %c: child PID %d term, NOT FOUND\n", ch, this); - - } else { - // found this PID in our list of children - if (ix != n) { - // ... but it's out of sequence - sprint(buf, "== %c: child %d (%d,%d) status %d\n", ch, ix, - n, this, status); - } else { - sprint(buf, "== %c: child %d (%d) status %d\n", ch, ix, - this, status); - } - } - } - - cwrites(buf); - - ++n; - - } while (n < nkids); - - exit(0); - - return (42); // shut the compiler up! -} |