diff options
| -rw-r--r-- | support/Makefile | 3 | ||||
| -rw-r--r-- | support/process_state.h | 43 | ||||
| -rw-r--r-- | support/support_process_state.c | 92 | ||||
| -rw-r--r-- | support/tst-support-process_state.c | 105 | ||||
| -rw-r--r-- | support/xgetline.c | 33 | ||||
| -rw-r--r-- | support/xstdio.h | 2 |
6 files changed, 278 insertions, 0 deletions
diff --git a/support/Makefile b/support/Makefile index a0304e6def..6e38b87ebe 100644 --- a/support/Makefile +++ b/support/Makefile @@ -56,6 +56,7 @@ libsupport-routines = \ support_format_hostent \ support_format_netent \ support_isolate_in_subprocess \ + support_process_state \ support_ptrace \ support_openpty \ support_paths \ @@ -95,6 +96,7 @@ libsupport-routines = \ xfopen \ xfork \ xftruncate \ + xgetline \ xgetsockname \ xlisten \ xlseek \ @@ -224,6 +226,7 @@ tests = \ tst-support_capture_subprocess \ tst-support_descriptors \ tst-support_format_dns_packet \ + tst-support-process_state \ tst-support_quote_blob \ tst-support_quote_string \ tst-support_record_failure \ diff --git a/support/process_state.h b/support/process_state.h new file mode 100644 index 0000000000..6c19afdbb7 --- /dev/null +++ b/support/process_state.h @@ -0,0 +1,43 @@ +/* Wait for process state. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef SUPPORT_PROCESS_STATE_H +#define SUPPORT_PROCESS_STATE_H + +#include <sys/types.h> + +enum support_process_state +{ + support_process_state_running = 0x01, /* R (running). */ + support_process_state_sleeping = 0x02, /* S (sleeping). */ + support_process_state_disk_sleep = 0x04, /* D (disk sleep). */ + support_process_state_stopped = 0x08, /* T (stopped). */ + support_process_state_tracing_stop = 0x10, /* t (tracing stop). */ + support_process_state_dead = 0x20, /* X (dead). */ + support_process_state_zombie = 0x40, /* Z (zombie). */ + support_process_state_parked = 0x80, /* P (parked). */ +}; + +/* Wait for process PID to reach state STATE. It can be a combination of + multiple possible states ('process_state_running | process_state_sleeping') + where the function return when any of these state are observed. + For an invalid state not represented by SUPPORT_PROCESS_STATE, it fallbacks + to a 2 second sleep. */ +void support_process_state_wait (pid_t pid, enum support_process_state state); + +#endif diff --git a/support/support_process_state.c b/support/support_process_state.c new file mode 100644 index 0000000000..76dc798728 --- /dev/null +++ b/support/support_process_state.c @@ -0,0 +1,92 @@ +/* Wait for process state. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <stdlib.h> +#include <time.h> +#include <string.h> + +#include <array_length.h> + +#include <support/process_state.h> +#include <support/xstdio.h> +#include <support/check.h> + +void +support_process_state_wait (pid_t pid, enum support_process_state state) +{ +#ifdef __linux__ + /* For Linux it does a polling check on /proc/<pid>/status checking on + third field. */ + + /* It mimics the kernel states from fs/proc/array.c */ + static const struct process_states + { + enum support_process_state s; + char v; + } process_states[] = { + { support_process_state_running, 'R' }, + { support_process_state_sleeping, 'S' }, + { support_process_state_disk_sleep, 'D' }, + { support_process_state_stopped, 'T' }, + { support_process_state_tracing_stop, 't' }, + { support_process_state_dead, 'X' }, + { support_process_state_zombie, 'Z' }, + { support_process_state_parked, 'P' }, + }; + + char spath[sizeof ("/proc/" + 3) * sizeof (pid_t) + sizeof ("/status") + 1]; + snprintf (spath, sizeof (spath), "/proc/%i/status", pid); + + FILE *fstatus = xfopen (spath, "r"); + char *line = NULL; + size_t linesiz = 0; + + for (;;) + { + char cur_state = -1; + while (xgetline (&line, &linesiz, fstatus) != -1) + if (strncmp (line, "State:", strlen ("State:")) == 0) + { + TEST_COMPARE (sscanf (line, "%*s %c", &cur_state), 1); + break; + } + /* Fallback to nanosleep for invalid state. */ + if (cur_state == -1) + break; + + for (size_t i = 0; i < array_length (process_states); ++i) + if (state & process_states[i].s && cur_state == process_states[i].v) + { + free (line); + xfclose (fstatus); + return; + } + + rewind (fstatus); + fflush (fstatus); + + if (nanosleep (&(struct timespec) { 0, 10000000 }, NULL) != 0) + FAIL_EXIT1 ("nanosleep: %m"); + } + + free (line); + xfclose (fstatus); + /* Fallback to nanosleep if an invalid state is found. */ +#endif + nanosleep (&(struct timespec) { 2, 0 }, NULL); +} diff --git a/support/tst-support-process_state.c b/support/tst-support-process_state.c new file mode 100644 index 0000000000..3fc103ab92 --- /dev/null +++ b/support/tst-support-process_state.c @@ -0,0 +1,105 @@ +/* Wait for process state tests. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <stdio.h> +#include <sys/wait.h> +#include <unistd.h> +#include <errno.h> + +#include <support/test-driver.h> +#include <support/process_state.h> +#include <support/check.h> +#include <support/xsignal.h> +#include <support/xunistd.h> + +#ifndef WEXITED +# define WEXITED 0 +#endif + +static void +sigusr1_handler (int signo) +{ +} + +static void +test_child (void) +{ + xsignal (SIGUSR1, sigusr1_handler); + + raise (SIGSTOP); + + TEST_COMPARE (pause (), -1); + TEST_COMPARE (errno, EINTR); + + while (1) + asm (""); +} + +static int +do_test (void) +{ + pid_t pid = xfork (); + if (pid == 0) + { + test_child (); + _exit (127); + } + + /* Adding process_state_tracing_stop ('t') allows the test to work under + trace programs such as ptrace. */ + enum support_process_state stop_state = support_process_state_stopped + | support_process_state_tracing_stop; + + if (test_verbose) + printf ("info: waiting pid %d, state_stopped/state_tracing_stop\n", + (int) pid); + support_process_state_wait (pid, stop_state); + + if (kill (pid, SIGCONT) != 0) + FAIL_RET ("kill (%d, SIGCONT): %m\n", pid); + + if (test_verbose) + printf ("info: waiting pid %d, state_sleeping\n", (int) pid); + support_process_state_wait (pid, support_process_state_sleeping); + + if (kill (pid, SIGUSR1) != 0) + FAIL_RET ("kill (%d, SIGUSR1): %m\n", pid); + + if (test_verbose) + printf ("info: waiting pid %d, state_running\n", (int) pid); + support_process_state_wait (pid, support_process_state_running); + + if (kill (pid, SIGKILL) != 0) + FAIL_RET ("kill (%d, SIGKILL): %m\n", pid); + + if (test_verbose) + printf ("info: waiting pid %d, state_zombie\n", (int) pid); + support_process_state_wait (pid, support_process_state_zombie); + + siginfo_t info; + int r = waitid (P_PID, pid, &info, WEXITED); + TEST_COMPARE (r, 0); + TEST_COMPARE (info.si_signo, SIGCHLD); + TEST_COMPARE (info.si_code, CLD_KILLED); + TEST_COMPARE (info.si_status, SIGKILL); + TEST_COMPARE (info.si_pid, pid); + + return 0; +} + +#include <support/test-driver.c> diff --git a/support/xgetline.c b/support/xgetline.c new file mode 100644 index 0000000000..180bc2db95 --- /dev/null +++ b/support/xgetline.c @@ -0,0 +1,33 @@ +/* fopen with error checking. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <support/xstdio.h> +#include <support/check.h> +#include <errno.h> + +ssize_t +xgetline (char **lineptr, size_t *n, FILE *stream) +{ + int old_errno = errno; + errno = 0; + size_t ret = getline (lineptr, n, stream); + if (!feof (stream) && ferror (stream)) + FAIL_EXIT1 ("getline failed: %m"); + errno = old_errno; + return ret; +} diff --git a/support/xstdio.h b/support/xstdio.h index b62267a2a2..143957b6a8 100644 --- a/support/xstdio.h +++ b/support/xstdio.h @@ -27,6 +27,8 @@ __BEGIN_DECLS FILE *xfopen (const char *path, const char *mode); void xfclose (FILE *); +ssize_t xgetline (char **lineptr, size_t *n, FILE *stream); + __END_DECLS #endif /* SUPPORT_XSTDIO_H */ |