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annotate lib/pending.c @ 1011:6cb9e7142574

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Remove files du no longer needs.
author Rob Landley <rob@landley.net>
date Sun, 18 Aug 2013 04:12:51 -0500
parents 893c86bbe452
children f8824260d057
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
949
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 for_each_pid_with_name_in(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 char cmd[sizeof(toybuf)], path[64];
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14 char **curname;
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15
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16 if (!(dp = opendir("/proc"))) perror_exit("opendir");
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17
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18 while ((entry = readdir(dp))) {
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19 int fd, n;
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20
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21 if (!isdigit(*entry->d_name)) continue;
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22
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23 if (sizeof(path) <= snprintf(path, sizeof(path), "/proc/%s/cmdline",
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24 entry->d_name)) continue;
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25
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26 if (-1 == (fd=open(path, O_RDONLY))) continue;
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27 n = read(fd, cmd, sizeof(cmd));
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28 close(fd);
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29 if (n<1) continue;
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30
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31 for (curname = names; *curname; curname++)
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32 if (!strcmp(basename(cmd), *curname))
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33 if (!callback(atol(entry->d_name), *curname)) goto done;
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34 }
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35 done:
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36 closedir(dp);
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37 }
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38
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39 /*
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40 * used to get the interger value.
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41 */
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42 unsigned long get_int_value(const char *numstr, unsigned lowrange, unsigned highrange)
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43 {
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44 unsigned long rvalue = 0;
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45 char *ptr;
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46 if(*numstr == '-' || *numstr == '+' || isspace(*numstr)) perror_exit("invalid number '%s'", numstr);
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47 errno = 0;
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48 rvalue = strtoul(numstr, &ptr, 10);
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49 if(errno || numstr == ptr) perror_exit("invalid number '%s'", numstr);
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50 if(*ptr) perror_exit("invalid number '%s'", numstr);
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51 if(rvalue >= lowrange && rvalue <= highrange) return rvalue;
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52 else {
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53 perror_exit("invalid number '%s'", numstr);
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54 return rvalue; //Not reachable; to avoid waring message.
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55 }
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56 }
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57
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58 /*
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59 * strcat to mallocated buffer
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60 * reallocate if need be
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61 */
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62 char *astrcat (char *x, char *y) {
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63 char *z;
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64 z = x;
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65 x = realloc (x, (x ? strlen (x) : 0) + strlen (y) + 1);
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66 if (!x) return 0;
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67 (z ? strcat : strcpy) (x, y);
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68 return x;
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69 }
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70
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71 /*
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72 * astrcat, but die on failure
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73 */
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74 char *xastrcat (char *x, char *y) {
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75 x = astrcat (x, y);
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76 if (!x) error_exit ("xastrcat");
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77 return x;
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78 }
995
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79
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80 void daemonize(void)
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81 {
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82 int fd = open("/dev/null", O_RDWR);
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83 if (fd < 0) fd = xcreate("/", O_RDONLY, 0666);
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84
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85 pid_t pid = fork();
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86 if (pid < 0) perror_exit("DAEMON: failed to fork");
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87 if (pid) exit(EXIT_SUCCESS);
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88
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89 setsid();
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90 dup2(fd, 0);
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91 dup2(fd, 1);
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92 dup2(fd, 2);
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93 if (fd > 2) close(fd);
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94 }