s6

Mirror/fork of https://skarnet.org/software/s6/
git clone https://ccx.te2000.cz/git/s6
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s6_svstatus_read.c (594B)

      1 /* ISC license. */
      2 
      3 #include <errno.h>
      4 #include <string.h>
      5 
      6 #include <skalibs/djbunix.h>
      7 #include <s6/supervise.h>
      8 
      9 int s6_svstatus_read (char const *dir, s6_svstatus_t *status)
     10 {
     11   ssize_t r ;
     12   size_t n = strlen(dir) ;
     13   char pack[S6_SVSTATUS_SIZE] ;
     14   char tmp[n + 1 + sizeof(S6_SVSTATUS_FILENAME)] ;
     15   memcpy(tmp, dir, n) ;
     16   memcpy(tmp + n, "/" S6_SVSTATUS_FILENAME, 1 + sizeof(S6_SVSTATUS_FILENAME)) ;
     17   r = openreadnclose(tmp, pack, S6_SVSTATUS_SIZE) ;
     18   if (r == -1) return 0 ;
     19   if (r < S6_SVSTATUS_SIZE) return (errno = EPIPE, 0) ;
     20   s6_svstatus_unpack(pack, status) ;
     21   return 1 ;
     22 }