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annotate lib/pending.c @ 1057:242c5de2bb22 draft

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Replace for_each_pid_with_name_in_array_perform_callback_function_upon_translated_value() with name_to_pid(), comparing absolute paths or just basename() consistently as spotted by Lukasz Skalski, and adjust callers.
author Rob Landley <rob@landley.net>
date Tue, 03 Sep 2013 18:43:32 -0500
parents f8824260d057
children 4263a4390758
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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59d4d453296b New stuff added to lib.c needs review too, so make a lib/pending.c and move several functions to it.
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1 /* pending.c - reusable stuff awaiting review
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2 *
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3 * new lib entries for stuff in toys/pending
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4 */
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5
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6 #include "toys.h"
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7
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8 // Execute a callback for each PID that matches a process name from a list.
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9 void name_to_pid(char **names, int (*callback)(pid_t pid, char *name))
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10 {
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11 DIR *dp;
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12 struct dirent *entry;
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13
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14 if (!(dp = opendir("/proc"))) perror_exit("opendir");
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15
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16 while ((entry = readdir(dp))) {
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17 int fd, n;
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18 unsigned u;
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19 char *cmd, **curname;
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20
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21 if (!(u = atoi(entry->d_name))) continue;
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22 sprintf(libbuf, "/proc/%u/cmdline", u);
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23 if (!(cmd = readfile(libbuf, libbuf, sizeof(libbuf)))) continue;
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24
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25 for (curname = names; *curname; curname++)
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26 if (*curname == '/' ? !strcmp(cmd, *curname)
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27 : !strcmp(basename(cmd), basename(*curname))
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28 if (!callback(u, *curname)) break;
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29 if (*curname) break;
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30 }
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31 closedir(dp);
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32 }
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33
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34 /*
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35 * used to get the interger value.
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36 */
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f8824260d057 Ashwini Sharma submitted route.c, adding it to pending.
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37 unsigned long get_int_value(const char *numstr, unsigned long lowrange, unsigned long highrange)
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38 {
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39 unsigned long rvalue = 0;
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40 char *ptr;
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41 if(*numstr == '-' || *numstr == '+' || isspace(*numstr)) perror_exit("invalid number '%s'", numstr);
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42 errno = 0;
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43 rvalue = strtoul(numstr, &ptr, 10);
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44 if(errno || numstr == ptr) perror_exit("invalid number '%s'", numstr);
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45 if(*ptr) perror_exit("invalid number '%s'", numstr);
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46 if(rvalue >= lowrange && rvalue <= highrange) return rvalue;
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47 else {
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48 perror_exit("invalid number '%s'", numstr);
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49 return rvalue; //Not reachable; to avoid waring message.
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50 }
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51 }
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52
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53 /*
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54 * strcat to mallocated buffer
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55 * reallocate if need be
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56 */
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57 char *astrcat (char *x, char *y) {
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58 char *z;
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59 z = x;
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60 x = realloc (x, (x ? strlen (x) : 0) + strlen (y) + 1);
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61 if (!x) return 0;
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62 (z ? strcat : strcpy) (x, y);
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63 return x;
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64 }
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65
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66 /*
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67 * astrcat, but die on failure
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68 */
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69 char *xastrcat (char *x, char *y) {
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70 x = astrcat (x, y);
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71 if (!x) error_exit ("xastrcat");
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72 return x;
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73 }
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74
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75 void daemonize(void)
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76 {
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77 int fd = open("/dev/null", O_RDWR);
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78 if (fd < 0) fd = xcreate("/", O_RDONLY, 0666);
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79
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80 pid_t pid = fork();
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81 if (pid < 0) perror_exit("DAEMON: failed to fork");
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82 if (pid) exit(EXIT_SUCCESS);
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83
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84 setsid();
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85 dup2(fd, 0);
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86 dup2(fd, 1);
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87 dup2(fd, 2);
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88 if (fd > 2) close(fd);
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89 }