94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* Wait for process state.
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#include <array_length.h>
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#include <intprops.h>
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#include <support/process_state.h>
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#include <support/xstdio.h>
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#include <support/check.h>
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void
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support_process_state_wait (pid_t pid, enum support_process_state state)
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{
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#ifdef __linux__
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/* For Linux it does a polling check on /proc/<pid>/status checking on
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third field. */
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/* It mimics the kernel states from fs/proc/array.c */
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static const struct process_states
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{
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enum support_process_state s;
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char v;
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} process_states[] = {
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{ support_process_state_running, 'R' },
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{ support_process_state_sleeping, 'S' },
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{ support_process_state_disk_sleep, 'D' },
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{ support_process_state_stopped, 'T' },
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{ support_process_state_tracing_stop, 't' },
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{ support_process_state_dead, 'X' },
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{ support_process_state_zombie, 'Z' },
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{ support_process_state_parked, 'P' },
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};
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char spath[sizeof ("/proc/") + INT_STRLEN_BOUND (pid_t) + sizeof ("/status") + 1];
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snprintf (spath, sizeof (spath), "/proc/%i/status", pid);
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FILE *fstatus = xfopen (spath, "r");
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char *line = NULL;
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size_t linesiz = 0;
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for (;;)
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{
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char cur_state = -1;
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while (xgetline (&line, &linesiz, fstatus) > 0)
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if (strncmp (line, "State:", strlen ("State:")) == 0)
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{
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TEST_COMPARE (sscanf (line, "%*s %c", &cur_state), 1);
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break;
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}
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/* Fallback to nanosleep for invalid state. */
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if (cur_state == -1)
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break;
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for (size_t i = 0; i < array_length (process_states); ++i)
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if (state & process_states[i].s && cur_state == process_states[i].v)
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{
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free (line);
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xfclose (fstatus);
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return;
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}
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rewind (fstatus);
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fflush (fstatus);
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if (nanosleep (&(struct timespec) { 0, 10000000 }, NULL) != 0)
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FAIL_EXIT1 ("nanosleep: %m");
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}
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free (line);
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xfclose (fstatus);
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/* Fallback to nanosleep if an invalid state is found. */
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#endif
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nanosleep (&(struct timespec) { 1, 0 }, NULL);
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}
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