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api-linux.c
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#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include "ps-internal.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <dirent.h>
#include <utmp.h>
#include <mntent.h>
#include <sys/sysinfo.h>
#include <sched.h>
#include <sys/vfs.h>
#ifndef __linux__
#include <libgen.h>
#endif
#include <sys/syscall.h>
#include <sys/epoll.h>
#include <time.h>
#include <sys/inotify.h>
#include <poll.h>
#include <Rinternals.h>
#include "common.h"
#include "cleancall.h"
#ifndef SYS_pidfd_open
#define SYS_pidfd_open 434
#endif
double psll_linux_boot_time = 0;
double psll_linux_clock_period = 0;
typedef struct {
char state;
int ppid, pgrp, session, tty_nr, tpgid;
unsigned int flags;
unsigned long minflt, cminflt, majflt, cmajflt, utime, stime;
long int cutime, cstime, priority, nice, num_threads, itrealvalue;
unsigned long long starttime;
} psl_stat_t;
#define PS__TV2DOUBLE(t) ((t).tv_sec + (t).tv_usec / 1000000.0)
#define PS__CHECK_STAT(stat, handle) \
do { \
double starttime = psll_linux_boot_time + \
((double)(stat.starttime) * psll_linux_clock_period); \
double diff = starttime - (handle)->create_time; \
if (fabs(diff) > psll_linux_clock_period) { \
ps__no_such_process((handle)->pid, 0); \
ps__throw_error(); \
} \
} while (0)
#define PS__CHECK_HANDLE(handle) \
do { \
psl_stat_t stat; \
if (psll__parse_stat_file(handle->pid, &stat, 0)) { \
ps__wrap_linux_error(handle); \
ps__throw_error(); \
} \
PS__CHECK_STAT(stat, handle); \
} while (0)
#define PS__GET_STATUS(stat, result, error) \
switch(stat) { \
case 'R': result = mkString("running"); break; \
case 'S': result = mkString("sleeping"); break; \
case 'D': result = mkString("disk_sleep"); break; \
case 'T': result = mkString("stopped"); break; \
case 't': result = mkString("tracing_stop"); break; \
case 'Z': result = mkString("zombie"); break; \
case 'X': result = mkString("dead"); break; \
case 'x': result = mkString("dead"); break; \
case 'K': result = mkString("wake_kill"); break; \
case 'W': result = mkString("waking"); break; \
default: error; \
}
int ps__read_file(const char *path, char **buffer, size_t buffer_size);
static void *ps__memmem(const void *haystack, size_t n1,
const void *needle, size_t n2) {
const unsigned char *p1 = haystack;
const unsigned char *p2 = needle;
const unsigned char *p3 = p1 + n1 - n2 + 1;
const unsigned char *p;
if (n2 == 0) return (void*)p1;
if (n2 > n1) return NULL;
for (p = p1; (p = memchr(p, *p2, p3 - p)) != NULL; p++) {
if (!memcmp(p, p2, n2)) return (void*)p;
}
return NULL;
}
void psll_finalizer(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
if (handle) free(handle);
}
void ps__wrap_linux_error(ps_handle_t *handle) {
char path[512];
int ret;
if (errno == ENOENT || errno == ESRCH) {
/* no such file error; might be raised also if the */
/* path actually exists for system processes with */
/* low pids (about 0-20) */
struct stat st;
snprintf(path, sizeof(path), "/proc/%i", handle->pid);
ret = lstat(path, &st);
if (!ret) {
/* process exists, other error */
ps__set_error_from_errno();
} else if (errno == ENOENT) {
ps__no_such_process(handle->pid, 0);
} else if (errno == EPERM || errno == EACCES) {
ps__access_denied("");
} else {
ps__set_error_from_errno();
}
} else {
ps__set_error_from_errno();
}
ps__throw_error();
}
int psll__readlink(const char *path, char **linkname) {
size_t size = 1024;
ssize_t r;
char *dpos;
*linkname = R_alloc(size, 1);
while (1) {
r = readlink(path, *linkname, size - 1);
if (r == (ssize_t) -1) {
return -1;
} else if (r < (ssize_t)1) {
errno = ENOENT;
return -1;
} else if (r < (ssize_t)(size - 1)) {
break;
}
*linkname = S_realloc(*linkname, size + 1024, size, 1);
size += 1024;
}
(*linkname)[r] = '\0';
/* readlink() might return paths containing null bytes ('\x00')
resulting in "TypeError: must be encoded string without NULL
bytes, not str" errors when the string is passed to other
fs-related functions (os.*, open(), ...).
Apparently everything after '\x00' is garbage (we can have
' (deleted)', 'new' and possibly others), see:
https://github.com/giampaolo/psutil/issues/717
For us this is not a problem, because mkString uses the string
up to the first zero byte, anyway.
Certain paths have ' (deleted)' appended. Usually this is
bogus as the file actually exists. Even if it doesn't we
don't care. */
if ((dpos = strstr(*linkname, " (deleted)")) != NULL &&
!strcmp(dpos, " (deleted)")) {
struct stat st;
int ret = stat(*linkname, &st);
if (!ret) *dpos = '\0';
}
return 0;
}
int psll__parse_stat_file(long pid, psl_stat_t *stat, char **name) {
char path[512];
int ret;
char *buf;
char *l, *r;
ret = snprintf(path, sizeof(path), "/proc/%ld/stat", pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read proc, path buffer too small");
return -1;
} else if (ret < 0) {
return -1;
}
ret = ps__read_file(path, &buf, /* buffer= */ 2048);
if (ret == -1) return -1;
/* This removes the last character, but that's a \n anyway.
At least we have a zero terminated string... */
*(buf + ret - 1) = '\0';
/* Find the first '(' and last ')', that's the end of the command */
l = strchr(buf, '(');
r = strrchr(buf, ')');
if (!l || !r) {
ps__set_error("Cannot parse stat file");
ps__throw_error();
}
*r = '\0';
if (name) *name = l + 1;
ret = sscanf(r+2,
"%c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %llu",
&stat->state, &stat->ppid, &stat->pgrp, &stat->session, &stat->tty_nr,
&stat->tpgid, &stat->flags, &stat->minflt, &stat->cminflt,
&stat->majflt, &stat->cmajflt, &stat->utime, &stat->stime,
&stat->cutime, &stat->cstime, &stat->priority, &stat->nice,
&stat->num_threads, &stat->itrealvalue, &stat->starttime);
if (ret == -1) {
return -1;
} else if (ret != 20) {
ps__set_error("Cannot parse stat file, parsed: %i/20 fields", ret);
return -1;
}
return 0;
}
void ps__check_for_zombie(ps_handle_t *handle, int err) {
psl_stat_t stat;
double diff;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, 0)) {
ps__wrap_linux_error(handle);
ps__throw_error();
}
diff = (psll_linux_boot_time +
((double)stat.starttime * psll_linux_clock_period)) -
handle->create_time;
if (fabs(diff) > psll_linux_clock_period) {
ps__no_such_process(handle->pid, 0);
err = 1;
} else if (stat.state == 'Z') {
ps__zombie_process(handle->pid);
err = 1;
} else {
ps__set_error_from_errno();
}
if (err) ps__throw_error();
}
int psll_linux_get_boot_time(void) {
int ret;
char *buf;
char *needle = "\nbtime ";
size_t needle_len = strlen(needle);
char *hit;
unsigned long btime;
ret = ps__read_file("/proc/stat", &buf, /* buffer= */ 2048);
if (ret == -1) return -1;
*(buf + ret - 1) = '\0';
hit = ps__memmem(buf, ret, needle, needle_len);
if (!hit) return -1;
ret = sscanf(hit + needle_len, "%lu", &btime);
if (ret != 1) return -1;
psll_linux_boot_time = (double) btime;
return 0;
}
int psll_linux_get_clock_period(void) {
double psll_linux_clock_ticks = sysconf(_SC_CLK_TCK);
if (psll_linux_clock_ticks == -1) {
ps__set_error_from_errno();
return -1;
}
psll_linux_clock_period = 1.0 / psll_linux_clock_ticks;
return 0;
}
int psll_linux_ctime(long pid, double *ctime) {
psl_stat_t stat;
int ret = psll__parse_stat_file(pid, &stat, 0);
if (ret) return ret;
if (!psll_linux_boot_time) {
ret = psll_linux_get_boot_time();
if (ret) return ret;
}
if (!psll_linux_clock_period) {
ret = psll_linux_get_clock_period();
if (ret) {
ps__throw_error();
}
}
*ctime = psll_linux_boot_time +
((double)stat.starttime * psll_linux_clock_period);
return 0;
}
SEXP psll_handle(SEXP pid, SEXP time) {
pid_t cpid = isNull(pid) ? getpid() : INTEGER(pid)[0];
double ctime;
ps_handle_t *handle;
SEXP res;
if (!isNull(time)) {
ctime = REAL(time)[0];
} else {
if (psll_linux_ctime(cpid, &ctime)) {
ps__set_error_from_errno();
ps__throw_error();
}
}
handle = malloc(sizeof(ps_handle_t));
if (!handle) {
ps__no_memory("");
ps__throw_error();
}
handle->pid = cpid;
handle->create_time = ctime;
handle->gone = 0;
PROTECT(res = R_MakeExternalPtr(handle, R_NilValue, R_NilValue));
R_RegisterCFinalizerEx(res, psll_finalizer, /* onexit */ 0);
setAttrib(res, R_ClassSymbol, mkString("ps_handle"));
UNPROTECT(1);
return res;
}
SEXP psll_format(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
SEXP name, status, result;
char *cname;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, &cname)) {
PROTECT(name = mkString("???"));
PROTECT(status = mkString("terminated"));
} else {
PROTECT(name = ps__str_to_utf8(cname));
PS__GET_STATUS(stat.state, status, status = mkString("unknown"));
PROTECT(status);
}
PROTECT(result = ps__build_list("OldO", name, (long) handle->pid,
handle->create_time, status));
/* We do not check that the pid is still valid here, because we want
to be able to format & print processes that have finished already. */
UNPROTECT(3);
return result;
}
SEXP psll_parent(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
SEXP ppid, parent;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, 0)) {
ps__wrap_linux_error(handle);
ps__throw_error();
}
PS__CHECK_STAT(stat, handle);
/* TODO: this is a race condition, because the parent process might
have just quit, so psll_handle() might fail. If this happens, then
we should try to query the ppid again. */
PROTECT(ppid = ScalarInteger(stat.ppid));
PROTECT(parent = psll_handle(ppid, R_NilValue));
UNPROTECT(2);
return parent;
}
SEXP psll_ppid(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, 0)) {
ps__wrap_linux_error(handle);
ps__throw_error();
}
PS__CHECK_STAT(stat, handle);
return ScalarInteger(stat.ppid);
}
SEXP psll_is_running(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
double ctime;
int ret;
if (!handle) error("Process pointer cleaned up already");
ret = psll_linux_ctime(handle->pid, &ctime);
if (ret) return ScalarLogical(0);
return ScalarLogical(ctime == handle->create_time);
}
SEXP psll_name(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
char *name;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, &name)) {
ps__wrap_linux_error(handle);
ps__throw_error();
}
PS__CHECK_STAT(stat, handle);
return ps__str_to_utf8(name);
}
SEXP psll_exe(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
int ret;
char *linkname;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%i/exe", handle->pid);
if (ret < 0) ps__throw_error();
ret = psll__readlink(path, &linkname);
if (ret) {
if (errno == ENOENT || errno == ESRCH) {
/* no such file error; might be raised also if the */
/* path actually exists for system processes with */
/* low pids (about 0-20) */
struct stat st;
snprintf(path, sizeof(path), "/proc/%i", handle->pid);
ret = lstat(path, &st);
if (!ret) {
/* process exists, but can't get exe */
ps__check_for_zombie(handle, 0);
return ScalarString(NA_STRING);
} else if (errno == ENOENT) {
ps__no_such_process(handle->pid, 0);
ps__throw_error();
}
}
ps__check_for_zombie(handle, 1);
}
PS__CHECK_HANDLE(handle);
return ps__str_to_utf8(linkname);
}
SEXP psll_cmdline(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
int ret;
char *buf, *ptr, *end, *prev;
char sep = '\0';
int nstr = 0;
SEXP result;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%d/cmdline", handle->pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read proc, path buffer too small");
ps__throw_error();
} else if (ret < 0) {
ps__set_error_from_errno();
ps__throw_error();
}
ret = ps__read_file(path, &buf, 1024);
if (ret <= 0) {
ps__check_for_zombie(handle, 1);
}
PS__CHECK_HANDLE(handle);
/* 'man proc' states that args are separated by null bytes '\0' */
/* and last char is supposed to be a null byte. Nevertheless */
/* some processes may change their cmdline after being started */
/* (via setproctitle() or similar), they are usually not */
/* compliant with this rule and use spaces instead. Google */
/* Chrome process is an example. See: */
/* https://github.com/giampaolo/psutil/issues/1179 */
if (buf[ret - 1] != '\0') sep = ' ';
/* Count number of vars first, then convert to strings */
for (ptr = buf, end = buf + ret; ptr < end; ptr++) {
if (*ptr == sep) nstr++;
}
PROTECT(result = allocVector(STRSXP, nstr));
for (ptr = prev = buf, nstr = 0; ptr < end; ptr++) {
if (!*ptr) {
SET_STRING_ELT(result, nstr++, mkCharLen(prev, ptr - prev));
prev = ptr + 1;
}
}
UNPROTECT(1);
return result;
}
SEXP psll_status(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
SEXP result;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, 0)) {
ps__wrap_linux_error(handle);
ps__throw_error();
}
PS__CHECK_STAT(stat, handle);
PS__GET_STATUS(stat.state, result, error("Unknown process status"));
return result;
}
SEXP psll_username(SEXP p) {
SEXP ids, ruid, pw, result;
PROTECT(ids = psll_uids(p));
PROTECT(ruid = ScalarInteger(INTEGER(ids)[0]));
PROTECT(pw = ps__get_pw_uid(ruid));
PROTECT(result = VECTOR_ELT(pw, 0));
UNPROTECT(4);
return result;
}
SEXP psll_cwd(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
int ret;
char *linkname;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%d/cwd", handle->pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read proc, path buffer too small");
ps__throw_error();
} else if (ret < 0) {
ps__set_error_from_errno();
ps__throw_error();
}
ret = psll__readlink(path, &linkname);
if (ret) {
ps__check_for_zombie(handle, 1);
}
PS__CHECK_HANDLE(handle);
return ps__str_to_utf8(linkname);
}
SEXP psll__ids(SEXP p, const char *needle) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
int ret;
char *buf;
size_t needle_len = strlen(needle);
char *hit;
unsigned long real, eff, saved;
SEXP result, names;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%i/status", handle->pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read proc, path buffer too small");
ps__throw_error();
} else if (ret < 0) {
ps__set_error_from_errno();
ps__throw_error();
}
ret = ps__read_file(path, &buf, /* buffer= */ 2048);
if (ret == -1) ps__check_for_zombie(handle, 1);
*(buf + ret - 1) = '\0';
hit = ps__memmem(buf, ret, needle, needle_len);
if (!hit) {
ps__set_error("Cannot read process status file");
ps__throw_error();
}
ret = sscanf(hit + needle_len, " %lu %lu %lu", &real, &eff, &saved);
if (ret != 3) {
ps__set_error("Cannot read process status file");
ps__throw_error();
}
PS__CHECK_HANDLE(handle);
PROTECT(result = allocVector(INTSXP, 3));
INTEGER(result)[0] = real;
INTEGER(result)[1] = eff;
INTEGER(result)[2] = saved;
PROTECT(names = ps__build_string("real", "effective", "saved", NULL));
setAttrib(result, R_NamesSymbol, names);
UNPROTECT(2);
return result;
}
SEXP psll_uids(SEXP p) {
return psll__ids(p, "\nUid:");
}
SEXP psll_gids(SEXP p) {
return psll__ids(p, "\nGid:");
}
SEXP psll_terminal(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
if (!handle) error("Process pointer cleaned up already");
if (psll__parse_stat_file(handle->pid, &stat, 0)) {
ps__wrap_linux_error(handle);
ps__throw_error();
}
PS__CHECK_STAT(stat, handle);
if (stat.tty_nr != 0) {
return ScalarInteger(stat.tty_nr);
}
if (handle->pid != getpid()) {
return ScalarInteger(NA_INTEGER);
}
// It is us, try ttyname. This is a workaround for qemu, where
// /proc/self/stat is messed up
char const *tty = ttyname (STDIN_FILENO);
if (! tty) {
return ScalarInteger(NA_INTEGER);
}
return mkString(tty);
}
SEXP psll_environ(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
int ret;
char *buf, *ptr, *end, *prev;
SEXP result = R_NilValue;
int nstr = 0;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%d/environ", handle->pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read proc, path buffer too small");
ps__throw_error();
} else if (ret < 0) {
ps__set_error_from_errno();
ps__throw_error();
}
ret = ps__read_file(path, &buf, /* buffer= */ 1024 * 32);
if (ret <= 0) {
ps__check_for_zombie(handle, 1);
} else {
PS__CHECK_HANDLE(handle);
}
*(buf + ret - 1) = '\0';
/* Count number of vars first, then convert to strings */
for (ptr = buf, end = buf + ret; ptr < end; ptr++) if (!*ptr) nstr++;
PROTECT(result = allocVector(STRSXP, nstr));
for (ptr = prev = buf, nstr = 0; ptr < end; ptr++) {
if (!*ptr) {
SET_STRING_ELT(result, nstr++, mkCharLen(prev, ptr - prev));
prev = ptr + 1;
}
}
UNPROTECT(1);
return result;
}
SEXP psll_num_threads(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
int ret;
if (!handle) error("Process pointer cleaned up already");
ret = psll__parse_stat_file(handle->pid, &stat, 0);
ps__check_for_zombie(handle, ret < 0);
PS__CHECK_STAT(stat, handle);
return ScalarInteger(stat.num_threads);
}
SEXP psll_cpu_times(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
psl_stat_t stat;
SEXP result, names;
int ret;
if (!handle) error("Process pointer cleaned up already");
ret = psll__parse_stat_file(handle->pid, &stat, 0);
ps__check_for_zombie(handle, ret < 0);
PS__CHECK_STAT(stat, handle);
PROTECT(result = allocVector(REALSXP, 4));
REAL(result)[0] = stat.utime * psll_linux_clock_period;
REAL(result)[1] = stat.stime * psll_linux_clock_period;
REAL(result)[2] = stat.cutime * psll_linux_clock_period;
REAL(result)[3] = stat.cstime * psll_linux_clock_period;
PROTECT(names = ps__build_string("user", "system", "children_user",
"children_system", NULL));
setAttrib(result, R_NamesSymbol, names);
UNPROTECT(2);
return result;
}
SEXP psll_memory_info(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
unsigned long rss, vms, shared, text, lib, data, dirty;
char path[512];
char *buf;
int ret;
SEXP result, names;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%d/statm", handle->pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read statm, path buffer too small");
ps__throw_error();
} else if (ret < 0) {
ps__set_error_from_errno();
ps__throw_error();
}
ret = ps__read_file(path, &buf, /* buffer= */ 1024);
ps__check_for_zombie(handle, ret <= 0);
*(buf + ret - 1) = '\0';
ret = sscanf(buf, "%lu %lu %lu %lu %lu %lu %lu", &vms, &rss, &shared,
&text, &lib, &data, &dirty);
if (ret != 7) {
ps__set_error_from_errno();
ps__throw_error();
}
PS__CHECK_HANDLE(handle);
#ifdef _SC_PAGESIZE
// recommended POSIX
int page_size = sysconf(_SC_PAGESIZE);
#elif _SC_PAGE_SIZE
// alias
int page_size = sysconf(_SC_PAGE_SIZE);
#endif
PROTECT(result = allocVector(REALSXP, 7));
REAL(result)[0] = rss * page_size;
REAL(result)[1] = vms * page_size;
REAL(result)[2] = shared * page_size;
REAL(result)[3] = text * page_size;
REAL(result)[4] = lib * page_size;
REAL(result)[5] = data * page_size;
REAL(result)[6] = dirty * page_size;
PROTECT(names = ps__build_string("rss", "vms", "shared", "text", "lib",
"data", "dirty", NULL));
setAttrib(result, R_NamesSymbol, names);
UNPROTECT(2);
return result;
}
SEXP ps__boot_time(void) {
if (psll_linux_boot_time == 0) {
if (psll_linux_get_boot_time()) {
ps__set_error_from_errno();
ps__throw_error();
}
}
return ScalarReal(psll_linux_boot_time);
}
SEXP ps__cpu_count_logical(void) {
int n = sysconf(_SC_NPROCESSORS_ONLN);
if (n >= 1) return ScalarInteger(n);
return(ScalarInteger(NA_INTEGER));
}
/* This is not used, because it is much easier to parse this file from R */
SEXP ps__cpu_count_physical(void) {
return R_NilValue;
}
static int psl__linux_match_environ(SEXP r_marker, SEXP r_pid) {
const char *marker = CHAR(STRING_ELT(r_marker, 0));
pid_t pid = INTEGER(r_pid)[0];
char path[512];
int ret;
char *buf;
ret = snprintf(path, sizeof(path), "/proc/%d/environ", (int) pid);
if (ret >= sizeof(path)) {
ps__set_error("Cannot read proc, path buffer too small");
return -1;
} else if (ret < 0) {
ps__set_error_from_errno();
return -1;
}
ret = ps__read_file(path, &buf, /* buffer= */ 1024 * 32);
if (ret == -1) {
ps__set_error_from_errno();
return -1;
}
return ps__memmem(buf, ret, marker, strlen(marker)) != NULL;
}
SEXP ps__find_if_env(SEXP r_marker, SEXP r_after, SEXP r_pid) {
SEXP phandle;
int match;
ps_handle_t *handle;
PROTECT(phandle = psll_handle(r_pid, R_NilValue));
handle = R_ExternalPtrAddr(phandle);
match = psl__linux_match_environ(r_marker, r_pid);
if (match == -1) ps__throw_error();
if (match) {
PS__CHECK_HANDLE(handle);
UNPROTECT(1);
return phandle;
}
UNPROTECT(1);
return R_NilValue;
}
SEXP psll_num_fds(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
DIR *dirs;
int ret;
int num = 0;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%i/fd", handle->pid);
if (ret < 0) ps__throw_error();
dirs = opendir(path);
if (!dirs) ps__check_for_zombie(handle, 1);
do {
errno = 0;
struct dirent *entry = readdir(dirs);
if (!entry) {
closedir(dirs);
if (!errno) break;
ps__check_for_zombie(handle, 1);
}
if (strncmp(".", entry->d_name, 2) &&
strncmp("..", entry->d_name, 3)) num++;
} while (1);
/* OSX throws on zombies, so for consistency we do the same here*/
ps__check_for_zombie(handle, 0);
PS__CHECK_HANDLE(handle);
return ScalarInteger(num);
}
SEXP psll_open_files(SEXP p) {
ps_handle_t *handle = R_ExternalPtrAddr(p);
char path[512];
DIR *dirs;
int ret;
int len = 10, num = 0;
char *linkname;
int fd, dfd;
PROTECT_INDEX pidx;
SEXP result;
if (!handle) error("Process pointer cleaned up already");
ret = snprintf(path, sizeof(path), "/proc/%i/fd", handle->pid);
if (ret < 0) ps__throw_error();
dirs = opendir(path);
if (!dirs) ps__check_for_zombie(handle, 1);
dfd = dirfd(dirs);
PROTECT_WITH_INDEX(result = allocVector(VECSXP, len), &pidx);
do {
errno = 0;
struct dirent *entry = readdir(dirs);
if (entry == NULL) {
closedir(dirs);
if (errno == 0) break;
ps__check_for_zombie(handle, 1);
}
if (!strncmp(".", entry->d_name, 2) ||
!strncmp("..", entry->d_name, 3)) continue;
ret = snprintf(path, sizeof(path), "/proc/%i/fd/%s", handle->pid,
entry->d_name);
if (ret < 0) {
closedir(dirs);
ps__throw_error();
}
ret = psll__readlink(path, &linkname);
if (ret) {
closedir(dirs);
if (errno == ENOENT || errno == ESRCH || errno == EINVAL) continue;
ps__check_for_zombie(handle, 1);
}
if (strncmp("socket:", linkname, 7) == 0) continue;
fd = strtol(entry->d_name, NULL, 10);
if (fd == dfd) continue;
if (++num == len) {
len *= 2;
REPROTECT(result = Rf_lengthgets(result, len), pidx);
}
SET_VECTOR_ELT(result, num, ps__build_list("si", linkname, fd));
} while (1);
/* OSX throws on zombies, so for consistency we do the same here*/
ps__check_for_zombie(handle, 0);
PS__CHECK_HANDLE(handle);
UNPROTECT(1);