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VFS: tweak coredump wrapper code

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Change-Id: I6c1f50910d906b25f6df2b48f2cbfb899850924e
This commit is contained in:
David van Moolenbroek 2015-08-31 12:01:26 +00:00
parent 253dbfc285
commit 9f15e7b366
2 changed files with 25 additions and 12 deletions
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8
minix/servers/vfs/main.c
View file

@ -620,6 +620,14 @@ void service_pm_postponed(void)
term_signal = job_m_in.VFS_PM_TERM_SIG;
core_path = (vir_bytes) job_m_in.VFS_PM_PATH;
/* A zero signal used to indicate that a coredump should be generated
* without terminating the target process, but this was broken in so
* many ways that we no longer support this. Userland should implement
* this functionality itself, for example through ptrace(2).
*/
if (term_signal == 0)
panic("no termination signal given for coredump!");
assert(proc_e == fp->fp_endpoint);
r = pm_dumpcore(term_signal, core_path);

29
minix/servers/vfs/misc.c
View file

@ -879,36 +879,41 @@ int do_svrctl(void)
*===========================================================================*/
int pm_dumpcore(int csig, vir_bytes exe_name)
{
int r = OK, core_fd;
int r, core_fd;
struct filp *f;
char core_path[PATH_MAX];
char proc_name[PROC_NAME_LEN];
/* if a process is blocked, fp->fp_fd holds the fd it's blocked on.
* free it up for use by common_open().
/* If a process is blocked, fp->fp_fd holds the fd it's blocked on. Free it
* up for use by common_open(). This step is the reason we cannot use this
* function to generate a core dump of a process while it is still running
* (i.e., without terminating it), as it changes the state of the process.
*/
if (fp_is_blocked(fp))
unpause();
/* open core file */
snprintf(core_path, PATH_MAX, "%s.%d", CORE_NAME, fp->fp_pid);
core_fd = common_open(core_path, O_WRONLY | O_CREAT | O_TRUNC, CORE_MODE);
if (core_fd < 0) { r = core_fd; goto core_exit; }
r = core_fd = common_open(core_path, O_WRONLY | O_CREAT | O_TRUNC,
CORE_MODE);
if (r < 0) goto core_exit;
/* get process' name */
r = sys_datacopy_wrapper(PM_PROC_NR, exe_name, VFS_PROC_NR, (vir_bytes) proc_name,
PROC_NAME_LEN);
/* get process name */
r = sys_datacopy_wrapper(PM_PROC_NR, exe_name, VFS_PROC_NR,
(vir_bytes) proc_name, PROC_NAME_LEN);
if (r != OK) goto core_exit;
proc_name[PROC_NAME_LEN - 1] = '\0';
if ((f = get_filp(core_fd, VNODE_WRITE)) == NULL) { r=EBADF; goto core_exit; }
/* write the core dump */
f = get_filp(core_fd, VNODE_WRITE);
assert(f != NULL);
write_elf_core_file(f, csig, proc_name);
unlock_filp(f);
(void) close_fd(fp, core_fd); /* ignore failure, we're exiting anyway */
core_exit:
if(csig)
free_proc(FP_EXITING);
/* The core file descriptor will be closed as part of the process exit. */
free_proc(FP_EXITING);
return(r);
}