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/* ProcFS - pid.c - generators for PID-specific files */
#include "inc.h"
#include <sys/mman.h>
#include <minix/vm.h>
static void pid_psinfo(int slot);
static void pid_cmdline(int slot);
static void pid_environ(int slot);
static void pid_map(int slot);
/*
* The files that are dynamically created in each PID directory. The data
* field contains each file's read function. Subdirectories are not yet
* supported.
*/
struct file pid_files[] = {
{ "psinfo", REG_ALL_MODE, (data_t) pid_psinfo },
{ "cmdline", REG_ALL_MODE, (data_t) pid_cmdline },
{ "environ", REG_ALL_MODE, (data_t) pid_environ },
{ "map", REG_ALL_MODE, (data_t) pid_map },
{ NULL, 0, (data_t) NULL }
};
/*
* Is the given slot a zombie process?
*/
static int
is_zombie(int slot)
{
return (slot >= NR_TASKS &&
(proc_list[slot - NR_TASKS].mpl_flags & MPLF_ZOMBIE));
}
/*
* Get MINIX3-specific process data for the process identified by the given
* kernel slot. Return OK or a negative error code.
*/
int
get_proc_data(pid_t pid, struct minix_proc_data * mpd)
{
int mib[4] = { CTL_MINIX, MINIX_PROC, PROC_DATA, pid };
size_t oldlen;
oldlen = sizeof(*mpd);
if (__sysctl(mib, __arraycount(mib), mpd, &oldlen, NULL, 0) != 0)
return -errno;
return OK;
}
/*
* Print process information. This feature is now used only by mtop(1), and as
* a result, we only provide information that mtop(1) actually uses. In the
* future, this file may be extended with additional fields again.
*/
static void
pid_psinfo(int slot)
{
struct minix_proc_data mpd;
struct vm_usage_info vui;
pid_t pid;
uid_t uid;
char *p;
int task, type, state;
if ((pid = pid_from_slot(slot)) == 0)
return;
if (get_proc_data(pid, &mpd) != OK)
return;
task = (slot < NR_TASKS);
/* Get the type of the process. */
if (task)
type = TYPE_TASK;
else if (mpd.mpd_flags & MPDF_SYSTEM)
type = TYPE_SYSTEM;
else
type = TYPE_USER;
/*
* Get the (rudimentary) state of the process. The zombie flag is also
* in the proc_list entry but it just may be set since we obtained that
* entry, in which case we'd end up with the wrong state here.
*/
if (mpd.mpd_flags & MPDF_ZOMBIE)
state = STATE_ZOMBIE;
else if (mpd.mpd_flags & MPDF_RUNNABLE)
state = STATE_RUN;
else if (mpd.mpd_flags & MPDF_STOPPED)
state = STATE_STOP;
else
state = STATE_SLEEP;
/* Get the process's effective user ID. */
if (!task)
uid = proc_list[slot - NR_TASKS].mpl_uid;
else
uid = 0;
/* Get memory usage. We do not care if this fails. */
memset(&vui, 0, sizeof(vui));
if (!(mpd.mpd_flags & MPDF_ZOMBIE))
(void)vm_info_usage(mpd.mpd_endpoint, &vui);
/* Spaces in the process name would mess up the output format. */
if ((p = strchr(mpd.mpd_name, ' ')) != NULL)
*p = '\0';
/* Print all the information. */
buf_printf("%d %c %d %s %c %d %d %u %u "
"%"PRIu64" %"PRIu64" %"PRIu64" %lu %d %u\n",
PSINFO_VERSION, /* information version */
type, /* process type */
mpd.mpd_endpoint, /* process endpoint */
mpd.mpd_name, /* process name */
state, /* process state letter */
mpd.mpd_blocked_on, /* endpt blocked on, or NONE */
mpd.mpd_priority, /* process priority */
mpd.mpd_user_time, /* user time */
mpd.mpd_sys_time, /* system time */
mpd.mpd_cycles, /* execution cycles */
mpd.mpd_kipc_cycles, /* kernel IPC cycles */
mpd.mpd_kcall_cycles, /* kernel call cycles */
vui.vui_total, /* total memory */
mpd.mpd_nice, /* nice value */
uid /* effective user ID */
);
}
/*
* Dump the process's command line as it is contained in the process itself.
* Each argument is terminated with a null character.
*/
static void
pid_cmdline(int slot)
{
char buf[BUF_SIZE];
int mib[] = { CTL_KERN, KERN_PROC_ARGS, 0, KERN_PROC_ARGV };
size_t oldlen;
pid_t pid;
/* Kernel tasks and zombies have no memory. */
if ((pid = pid_from_slot(slot)) <= 0 || is_zombie(slot))
return;
mib[2] = proc_list[slot - NR_TASKS].mpl_pid;
/* TODO: zero-copy into the main output buffer */
oldlen = sizeof(buf);
if (__sysctl(mib, __arraycount(mib), buf, &oldlen, NULL, 0) != 0)
return;
buf_append(buf, oldlen);
}
/*
* Dump the process's initial environment as it is contained in the process
* itself. Each entry is terminated with a null character.
*/
static void
pid_environ(int slot)
{
char buf[BUF_SIZE];
int mib[] = { CTL_KERN, KERN_PROC_ARGS, 0, KERN_PROC_ENV };
size_t oldlen;
pid_t pid;
/* Kernel tasks and zombies have no memory. */
if ((pid = pid_from_slot(slot)) <= 0 || is_zombie(slot))
return;
mib[2] = proc_list[slot - NR_TASKS].mpl_pid;
/* TODO: zero-copy into the main output buffer */
oldlen = sizeof(buf);
if (__sysctl(mib, __arraycount(mib), buf, &oldlen, NULL, 0) != 0)
return;
buf_append(buf, oldlen);
}
/*
* Print the virtual memory regions of a process.
*/
static void
pid_map(int slot)
{
struct minix_proc_data mpd;
struct vm_region_info vri[MAX_VRI_COUNT];
vir_bytes next;
pid_t pid;
int i, r, count;
/* Kernel tasks and zombies have no memory. */
if ((pid = pid_from_slot(slot)) <= 0 || is_zombie(slot))
return;
/* Get the process endpoint. */
if (get_proc_data(pid, &mpd) != OK)
return;
count = 0;
next = 0;
do {
r = vm_info_region(mpd.mpd_endpoint, vri, MAX_VRI_COUNT,
&next);
if (r <= 0)
break;
for (i = 0; i < r; i++) {
buf_printf("%08lx-%08lx %c%c%c\n",
vri[i].vri_addr,
vri[i].vri_addr + vri[i].vri_length,
(vri[i].vri_prot & PROT_READ) ? 'r' : '-',
(vri[i].vri_prot & PROT_WRITE) ? 'w' : '-',
(vri[i].vri_prot & PROT_EXEC) ? 'x' : '-');
count++;
}
} while (r == MAX_VRI_COUNT);
}
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