If I write a PCSTRACE control message to /proc/pid/ctl, the write will fail.
However, if I write a PCSET control message using the same format, it will
succeed. Any suggestions on where I could be going wrong?
[u]Code that fails on write:[/u]
struct iovec piov[2];
sigset_t *sigset;
long operation;
/* Build the Control Message */
operation = PCSTRACE;
piov[0].iov_base = (caddr_t)(&operation);
piov[0].iov_len = sizeof(operation);
premptyset(&sigset);
praddset(&sigset, SIGEMT);
piov[1].iov_base = (caddr_t)(&argument);
piov[1].iov_len = sizeof(argument);
/* Write the control message to the ctl file */
if ((err = writev(fd, piov, 2)) == -1) {
sprintf(msg, "ERROR: Cannot write to /proc/%d/ctl\n", p);
log_message(LOG_FILE, msg);
exit (1);
}
[u]Code that succeeds on write:[/u]
...
long argument;
/* Build the Control Message */
operation = PCSET;
piov[0].iov_base = (caddr_t)(&operation);
piov[0].iov_len = sizeof(operation);
argument = PR_MSACCT;
piov[1].iov_base = (caddr_t)(&argument);
piov[1].iov_len = sizeof(argument);
/* Finally write the control message to the ctl file */
if ((err = writev(fd, piov, 2)) == -1) {
sprintf(msg, "ERROR: Cannot write to /proc/%d/ctl\n", p);
log_message(LOG_FILE, msg);
exit (1);
}
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