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annotate lib/pending.c @ 979:53a9bcb938f0

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Move renice from pending to posix, default y, fix link to standard.
author Rob Landley <rob@landley.net>
date Wed, 31 Jul 2013 16:36:57 -0500
parents 59d4d453296b
children 893c86bbe452
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 char* make_human_readable(unsigned long long size, unsigned long unit)
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40 {
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41 unsigned int frac = 0;
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42 if(unit) {
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43 size = (size/(unit)) + (size%(unit)?1:0);
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44 return xmsprintf("%llu", size);
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45 }
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46 else {
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47 static char units[] = {'\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'};
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48 int index = 0;
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49 while(size >= 1024) {
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50 frac = size%1024;
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51 size /= 1024;
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52 index++;
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53 }
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54 frac = (frac/102) + ((frac%102)?1:0);
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55 if(frac >= 10) {
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56 size += 1;
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57 frac = 0;
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58 }
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59 if(frac) return xmsprintf("%llu.%u%c", size, frac, units[index]);
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60 else return xmsprintf("%llu%c", size, units[index]);
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61 }
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62 return NULL; //not reached
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63 }
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64
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65 /*
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66 * used to get the interger value.
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67 */
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68 unsigned long get_int_value(const char *numstr, unsigned lowrange, unsigned highrange)
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69 {
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70 unsigned long rvalue = 0;
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71 char *ptr;
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72 if(*numstr == '-' || *numstr == '+' || isspace(*numstr)) perror_exit("invalid number '%s'", numstr);
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73 errno = 0;
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74 rvalue = strtoul(numstr, &ptr, 10);
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75 if(errno || numstr == ptr) perror_exit("invalid number '%s'", numstr);
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76 if(*ptr) perror_exit("invalid number '%s'", numstr);
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77 if(rvalue >= lowrange && rvalue <= highrange) return rvalue;
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78 else {
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79 perror_exit("invalid number '%s'", numstr);
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80 return rvalue; //Not reachable; to avoid waring message.
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81 }
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82 }
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83
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84 /*
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85 * strcat to mallocated buffer
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86 * reallocate if need be
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87 */
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88 char *astrcat (char *x, char *y) {
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89 char *z;
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90 z = x;
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91 x = realloc (x, (x ? strlen (x) : 0) + strlen (y) + 1);
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92 if (!x) return 0;
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93 (z ? strcat : strcpy) (x, y);
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94 return x;
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95 }
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96
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97 /*
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98 * astrcat, but die on failure
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99 */
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100 char *xastrcat (char *x, char *y) {
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101 x = astrcat (x, y);
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102 if (!x) error_exit ("xastrcat");
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103 return x;
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104 }