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util: Add virProcessGetStat
This reads and separates all fields from /proc/<pid>/stat or /proc/<pid>/task/<tid>/stat as there are easy mistakes to be done in the implementation. Some tests are added to show it works correctly. No number parsing is done as it would be unused for most of the fields most, if not all, of the time. No struct is used for the result as the length can vary (new fields can be added in the future). Signed-off-by: Martin Kletzander <mkletzan@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
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@ -3100,6 +3100,7 @@ virProcessGetMaxMemLock;
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virProcessGetNamespaces;
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virProcessGetNamespaces;
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virProcessGetPids;
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virProcessGetPids;
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virProcessGetStartTime;
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virProcessGetStartTime;
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virProcessGetStat;
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virProcessGroupGet;
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virProcessGroupGet;
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virProcessGroupKill;
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virProcessGroupKill;
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virProcessKill;
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virProcessKill;
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@ -1721,3 +1721,80 @@ virProcessSetScheduler(pid_t pid G_GNUC_UNUSED,
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}
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}
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#endif /* !WITH_SCHED_SETSCHEDULER */
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#endif /* !WITH_SCHED_SETSCHEDULER */
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/*
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* Get all stat fields for a process based on pid and tid:
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* - pid == 0 && tid == 0 => /proc/self/stat
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* - pid != 0 && tid == 0 => /proc/<pid>/stat
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* - pid == 0 && tid != 0 => /proc/self/task/<tid>/stat
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* - pid != 0 && tid != 0 => /proc/<pid>/task/<tid>/stat
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* and return them as array of strings.
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*/
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GStrv
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virProcessGetStat(pid_t pid,
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pid_t tid)
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{
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int len = 10 * 1024; /* 10kB ought to be enough for everyone */
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g_autofree char *buf = NULL;
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g_autofree char *path = NULL;
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GStrv rest = NULL;
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GStrv ret = NULL;
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char *comm = NULL;
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char *rparen = NULL;
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size_t nrest = 0;
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if (pid) {
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if (tid)
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path = g_strdup_printf("/proc/%d/task/%d/stat", (int)pid, (int)tid);
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else
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path = g_strdup_printf("/proc/%d/stat", (int)pid);
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} else {
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if (tid)
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path = g_strdup_printf("/proc/self/task/%d/stat", (int)tid);
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else
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path = g_strdup("/proc/self/stat");
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}
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len = virFileReadAllQuiet(path, len, &buf);
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if (len < 0)
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return NULL;
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/* eliminate trailing spaces */
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while (len > 0 && g_ascii_isspace(buf[--len]))
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buf[len] = '\0';
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/* Find end of the first field */
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if (!(comm = strchr(buf, ' ')))
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return NULL;
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*comm = '\0';
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/* Check start of the second field (filename of the executable, in
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* parentheses) */
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comm++;
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if (*comm != '(')
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return NULL;
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comm++;
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/* Check end of the second field (last closing parenthesis) */
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rparen = strrchr(comm, ')');
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if (!rparen)
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return NULL;
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*rparen = '\0';
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/* We need to check that the next char is not '\0', but why not just opt in
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* for the safer way of checking whether it is ' ' (space) instead */
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if (rparen[1] != ' ')
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return NULL;
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rest = g_strsplit(rparen + 2, " ", 0);
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nrest = g_strv_length(rest);
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ret = g_new0(char *, nrest + 3);
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ret[0] = g_strdup(buf);
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ret[1] = g_strdup(comm);
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memcpy(ret + 2, rest, nrest * sizeof(char *));
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/* Do not use g_strfreev() as individual elements they were moved to @ret. */
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VIR_FREE(rest);
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return ret;
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}
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@ -117,6 +117,72 @@ int virProcessSetupPrivateMountNS(void);
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int virProcessSetScheduler(pid_t pid,
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int virProcessSetScheduler(pid_t pid,
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virProcessSchedPolicy policy,
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virProcessSchedPolicy policy,
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int priority);
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int priority);
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GStrv virProcessGetStat(pid_t pid, pid_t tid);
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/* These constants are modelled after proc(5) */
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enum {
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VIR_PROCESS_STAT_PID,
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VIR_PROCESS_STAT_COMM,
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VIR_PROCESS_STAT_STATE,
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VIR_PROCESS_STAT_PPID,
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VIR_PROCESS_STAT_PGRP,
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VIR_PROCESS_STAT_SESSION,
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VIR_PROCESS_STAT_TTY_NR,
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VIR_PROCESS_STAT_TPGID,
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VIR_PROCESS_STAT_FLAGS,
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VIR_PROCESS_STAT_MINFLT,
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VIR_PROCESS_STAT_CMINFLT,
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VIR_PROCESS_STAT_MAJFLT,
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VIR_PROCESS_STAT_CMAJFLT,
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VIR_PROCESS_STAT_UTIME,
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VIR_PROCESS_STAT_STIME,
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VIR_PROCESS_STAT_CUTIME,
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VIR_PROCESS_STAT_CSTIME,
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VIR_PROCESS_STAT_PRIORITY,
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VIR_PROCESS_STAT_NICE,
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VIR_PROCESS_STAT_NUM_THREADS,
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VIR_PROCESS_STAT_ITREALVALUE,
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VIR_PROCESS_STAT_STARTTIME,
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VIR_PROCESS_STAT_VSIZE,
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VIR_PROCESS_STAT_RSS,
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VIR_PROCESS_STAT_RSSLIM,
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VIR_PROCESS_STAT_STARTCODE,
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VIR_PROCESS_STAT_ENDCODE,
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VIR_PROCESS_STAT_STARTSTACK,
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VIR_PROCESS_STAT_KSTKESP,
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VIR_PROCESS_STAT_KSTKEIP,
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VIR_PROCESS_STAT_SIGNAL,
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VIR_PROCESS_STAT_BLOCKED,
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VIR_PROCESS_STAT_SIGIGNORE,
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VIR_PROCESS_STAT_SIGCATCH,
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VIR_PROCESS_STAT_WCHAN,
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VIR_PROCESS_STAT_NSWAP,
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VIR_PROCESS_STAT_CNSWAP,
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VIR_PROCESS_STAT_EXIT_SIGNAL,
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VIR_PROCESS_STAT_PROCESSOR,
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VIR_PROCESS_STAT_RT_PRIORITY,
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VIR_PROCESS_STAT_POLICY,
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VIR_PROCESS_STAT_DELAYACCT_BLKIO_TICKS,
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VIR_PROCESS_STAT_GUEST_TIME,
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VIR_PROCESS_STAT_CGUEST_TIME,
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VIR_PROCESS_STAT_START_DATA,
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VIR_PROCESS_STAT_END_DATA,
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VIR_PROCESS_STAT_START_BRK,
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VIR_PROCESS_STAT_ARG_START,
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VIR_PROCESS_STAT_ARG_END,
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VIR_PROCESS_STAT_ENV_START,
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VIR_PROCESS_STAT_ENV_END,
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VIR_PROCESS_STAT_EXIT_CODE,
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};
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/*
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* At the time of writing there are 52 values reported in /proc/.../stat, the
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* line below checks that the last one has the right value, increase accordingly
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* based on proc(5) whenever adding new fields.
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*/
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G_STATIC_ASSERT(VIR_PROCESS_STAT_EXIT_CODE == 51);
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typedef enum {
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typedef enum {
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VIR_PROCESS_NAMESPACE_MNT = (1 << 1),
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VIR_PROCESS_NAMESPACE_MNT = (1 << 1),
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VIR_PROCESS_NAMESPACE_IPC = (1 << 2),
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VIR_PROCESS_NAMESPACE_IPC = (1 << 2),
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@ -347,6 +347,7 @@ if host_machine.system() == 'linux'
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{ 'name': 'scsihosttest' },
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{ 'name': 'scsihosttest' },
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{ 'name': 'vircaps2xmltest', 'link_whole': [ test_file_wrapper_lib ] },
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{ 'name': 'vircaps2xmltest', 'link_whole': [ test_file_wrapper_lib ] },
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{ 'name': 'virnetdevbandwidthtest' },
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{ 'name': 'virnetdevbandwidthtest' },
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{ 'name': 'virprocessstattest', 'link_whole': [ test_file_wrapper_lib ] },
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{ 'name': 'virresctrltest', 'link_whole': [ test_file_wrapper_lib ] },
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{ 'name': 'virresctrltest', 'link_whole': [ test_file_wrapper_lib ] },
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{ 'name': 'virscsitest' },
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{ 'name': 'virscsitest' },
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{ 'name': 'virusbtest' },
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{ 'name': 'virusbtest' },
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2
tests/virprocessstatdata/complex/stat
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2
tests/virprocessstatdata/complex/stat
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@ -0,0 +1,2 @@
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1 (this) is ( a weird )
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)( (command ( ) 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
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1
tests/virprocessstatdata/simple/stat
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1
tests/virprocessstatdata/simple/stat
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@ -0,0 +1 @@
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1 (command) 3 4 5
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88
tests/virprocessstattest.c
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88
tests/virprocessstattest.c
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@ -0,0 +1,88 @@
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#include <config.h>
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#include "testutils.h"
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#include "virfilewrapper.h"
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#include "virprocess.h"
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struct testData {
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const char *filename;
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const char *command;
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size_t count;
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bool self;
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};
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static int
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test_virProcessGetStat(const void *opaque)
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{
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struct testData *data = (struct testData *) opaque;
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g_autofree char *data_dir = NULL;
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g_auto(GStrv) proc_stat = NULL;
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size_t len = 0;
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id_t id = data->self ? 0 : -1;
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const char *command = NULL;
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data_dir = g_strdup_printf("%s/virprocessstatdata/%s/",
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abs_srcdir, data->filename);
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/* We are using predictable id of -1 because this case we will clearly see
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* that the test failed in case of virFileWrapper failure */
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if (id)
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virFileWrapperAddPrefix("/proc/-1/task/-1/", data_dir);
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else
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virFileWrapperAddPrefix("/proc/self/", data_dir);
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proc_stat = virProcessGetStat(id, id);
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virFileWrapperClearPrefixes();
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if (!proc_stat) {
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fprintf(stderr, "Could not get process stats\n");
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return -1;
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}
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len = g_strv_length(proc_stat);
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if (data->count != len) {
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fprintf(stderr, "Count incorrect, expected %zu, got %zu\n",
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data->count, len);
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return -1;
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}
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command = proc_stat[VIR_PROCESS_STAT_COMM];
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if (!STREQ_NULLABLE(data->command, command)) {
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fprintf(stderr, "Command incorrect, expected %s, got %s\n",
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data->command, command);
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return -1;
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}
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return 0;
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}
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static int
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mymain(void)
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{
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struct testData data = {0};
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int ret = 0;
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#define DO_TEST(_filename, _command, _count, _self) \
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do { \
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data = (struct testData){ \
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.filename = _filename, \
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.command = _command, \
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.count = _count, \
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.self = _self, \
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}; \
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if (virTestRun("Reading process stat: " _filename, \
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test_virProcessGetStat, &data) < 0) \
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ret = -1; \
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} while (0)
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DO_TEST("simple", "command", 5, true);
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DO_TEST("complex", "this) is ( a \t weird )\n)( (command ( ", 100, false);
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return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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VIR_TEST_MAIN(mymain)
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