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libmach: detail for darwin errors

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R=r, r2
CC=golang-dev
https://golang.org/cl/2937041
This commit is contained in:
Russ Cox 2010-11-05 23:03:53 -04:00
parent fa7341aafd
commit 81cf9f7e63
1 changed files with 9 additions and 2 deletions
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11
src/libmach/darwin.c
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@ -807,8 +807,10 @@ ctlproc(int id, char *msg)
// Find Mach thread for pid and suspend it. // Find Mach thread for pid and suspend it.
t = addpid(id, 1); t = addpid(id, 1);
if(t == nil) if(t == nil) {
fprint(2, "ctlproc attached: addpid: %r\n");
return -1; return -1;
}
if(me(thread_suspend(t->thread)) < 0){ if(me(thread_suspend(t->thread)) < 0){
fprint(2, "ctlproc attached: thread_suspend: %r\n"); fprint(2, "ctlproc attached: thread_suspend: %r\n");
return -1; return -1;
@ -816,7 +818,12 @@ ctlproc(int id, char *msg)
// Let ptrace tell the process to keep going: // Let ptrace tell the process to keep going:
// then ptrace is out of the way and we're back in Mach land. // then ptrace is out of the way and we're back in Mach land.
return ptrace(PT_CONTINUE, id, (caddr_t)1, 0); if(ptrace(PT_CONTINUE, id, (caddr_t)1, 0) < 0) {
fprint(2, "ctlproc attached: ptrace continue: %r\n");
return -1;
}
return 0;
} }
// All the other control messages require a Thread structure. // All the other control messages require a Thread structure.