Phil, Thanks a lot for the code Anand Neeli
On Wed, Apr 8, 2015 at 2:05 AM, Philippe Proulx <[email protected]> wrote: > Anand, > > On Tue, Apr 7, 2015 at 4:19 PM, Anand Neeli <[email protected]> wrote: > > For C > > lttng-relayd does not write its PID to a file. > > For C, here's the programmatic way of getting the PID of the first > lttng-relayd process found (inspired by [1]): > > #include <stdlib.h> > #include <stdio.h> > #include <string.h> > #include <dirent.h> > > /* checks if the string is purely an integer > * we can do it with `strtol' also > */ > int check_if_number (char *str) > { > int i; > for (i=0; str[i] != '\0'; i++) > { > if (!isdigit (str[i])) > { > return 0; > } > } > return 1; > } > > #define MAX_BUF 1024 > #define PID_LIST_BLOCK 32 > > int *pidof (char *pname) > { > DIR *dirp; > FILE *fp; > struct dirent *entry; > int *pidlist, pidlist_index = 0, pidlist_realloc_count = 1; > char path[MAX_BUF], read_buf[MAX_BUF]; > > dirp = opendir ("/proc/"); > if (dirp == NULL) > { > perror ("Fail"); > return NULL; > } > > pidlist = malloc (sizeof (int) * PID_LIST_BLOCK); > if (pidlist == NULL) > { > return NULL; > } > > while ((entry = readdir (dirp)) != NULL) > { > if (check_if_number (entry->d_name)) > { > strcpy (path, "/proc/"); > strcat (path, entry->d_name); > strcat (path, "/comm"); > > /* A file may not exist, it may have been removed. > * dut to termination of the process. Actually we need to > * make sure the error is actually file does not exist to > * be accurate. > */ > fp = fopen (path, "r"); > if (fp != NULL) > { > fscanf (fp, "%s", read_buf); > if (strcmp (read_buf, pname) == 0) > { > /* add to list and expand list if needed */ > pidlist[pidlist_index++] = atoi (entry->d_name); > if (pidlist_index == PID_LIST_BLOCK * pidlist_realloc_count) > { > pidlist_realloc_count++; > pidlist = realloc (pidlist, sizeof (int) * > PID_LIST_BLOCK * pidlist_realloc_count); //Error check todo > if (pidlist == NULL) > { > return NULL; > } > } > } > fclose (fp); > } > } > } > > > closedir (dirp); > pidlist[pidlist_index] = -1; /* indicates end of list */ > return pidlist; > } > > int main (void) > { > int *list = pidof("lttng-relayd"); > > if (!list || list[0] == -1) { > fprintf(stderr, "lttng-relayd is not running!\n"); > free(list); > return 1; > } > > printf("PID of first lttng-relayd found: %d\n", list[0]); > free(list); > > return 0; > } > > [1] > http://phoxis.org/2013/09/13/find-process-ids-of-a-running-process-by-name/ > > Hope it helps, > Phil > > > > > > > > > > > On Wed, Apr 8, 2015 at 1:45 AM, Philippe Proulx <[email protected] > > > > wrote: > >> > >> Anand, > >> > >> On Tue, Apr 7, 2015 at 4:07 PM, Anand Neeli <[email protected]> > wrote: > >> > > >> > Hi All, > >> > Is there any better way of getting lttng-relayd PID programmatically? > >> > > >> > like sessiond pid is in /var/run/lttng/lttng-sessiond.pid, is there > any > >> > similar way to get relayd PID? > >> > >> For which language? > >> > >> Phil > >> > > >> > > >> > Thanks, > >> > Anand Neeli > >> > > >> > _______________________________________________ > >> > lttng-dev mailing list > >> > [email protected] > >> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > >> > > > > > >
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