Freeze a thread in the process that's associated with the file descriptor.
#include <sys/procfs.h> #define DCMD_PROC_FREEZETHREAD __DIOT(_DCMD_PROC, __PROC_SUBCMD_PROCFS + 15, pthread_t)
The arguments to devctl() are:
| Argument | Value |
|---|---|
| filedes | A file descriptor for the process. You must have opened the file descriptor for writing. |
| dcmd | DCMD_PROC_FREEZETHREAD |
| dev_data_ptr | A pointer to a pthread_t |
| n_bytes | sizeof(pthread_t) |
| dev_info_ptr | NULL |
The argument is a pointer to a pthread_t value that specifies the thread to be frozen. For example:
devctl( fd, DCMD_PROC_FREEZETHREAD, &tid, sizeof tid, NULL);
To unfreeze the thread, use DCMD_PROC_THAWTHREAD.