s6-fdholder-getdump.c (2751B)
1 /* ISC license. */ 2 3 #include <string.h> 4 #include <limits.h> 5 6 #include <skalibs/types.h> 7 #include <skalibs/strerr.h> 8 #include <skalibs/sgetopt.h> 9 #include <skalibs/tai.h> 10 #include <skalibs/djbunix.h> 11 #include <skalibs/genalloc.h> 12 #include <skalibs/exec.h> 13 14 #include <s6/fdholder.h> 15 16 #define USAGE "s6-fdholder-getdump [ -t timeout ] socket prog..." 17 #define dieusage() strerr_dieusage(100, USAGE) 18 19 int main (int argc, char const *const *argv, char const *const *envp) 20 { 21 s6_fdholder_t a = S6_FDHOLDER_ZERO ; 22 genalloc dump = GENALLOC_ZERO ; 23 tain deadline, halfinfinite ; 24 PROG = "s6-fdholder-getdump" ; 25 { 26 unsigned int t = 0 ; 27 subgetopt l = SUBGETOPT_ZERO ; 28 for (;;) 29 { 30 int opt = subgetopt_r(argc, argv, "t:", &l) ; 31 if (opt == -1) break ; 32 switch (opt) 33 { 34 case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ; 35 default : dieusage() ; 36 } 37 } 38 argc -= l.ind ; argv += l.ind ; 39 if (t) tain_from_millisecs(&deadline, t) ; 40 else deadline = tain_infinite_relative ; 41 } 42 if (argc < 2) dieusage() ; 43 44 tain_now_set_stopwatch_g() ; 45 tain_add_g(&deadline, &deadline) ; 46 if (!s6_fdholder_start_g(&a, argv[0], &deadline)) 47 strerr_diefu2sys(111, "connect to a fd-holder daemon at ", argv[0]) ; 48 if (!s6_fdholder_getdump_g(&a, &dump, &deadline)) 49 strerr_diefu1sys(1, "get dump") ; 50 s6_fdholder_end(&a) ; 51 tain_half(&halfinfinite, &tain_infinite_relative) ; 52 tain_add_g(&halfinfinite, &halfinfinite) ; 53 { 54 size_t n = genalloc_len(s6_fdholder_fd_t, &dump) ; 55 size_t pos = 0 ; 56 unsigned int i = 0 ; 57 char modifs[7 + UINT_FMT + (25 + TIMESTAMP + 4 * UINT_FMT) * n] ; 58 if (n > UINT_MAX) strerr_dief1x(100, "dump exceeds maximum size") ; 59 memcpy(modifs + pos, "S6_FD#=", 7) ; pos += 7 ; 60 pos += uint_fmt(modifs + pos, n) ; 61 modifs[pos++] = 0 ; 62 for (; i < n ; i++) 63 { 64 s6_fdholder_fd_t *p = genalloc_s(s6_fdholder_fd_t, &dump) + i ; 65 size_t len = strlen(p->id) + 1 ; 66 if (uncoe(p->fd) < 0) strerr_diefu1sys(111, "uncoe") ; 67 memcpy(modifs + pos, "S6_FD_", 6) ; pos += 6 ; 68 pos += uint_fmt(modifs + pos, i) ; 69 modifs[pos++] = '=' ; 70 pos += uint_fmt(modifs + pos, p->fd) ; 71 modifs[pos++] = 0 ; 72 memcpy(modifs + pos, "S6_FDID_", 8) ; pos += 8 ; 73 pos += uint_fmt(modifs + pos, i) ; 74 modifs[pos++] = '=' ; 75 memcpy(modifs + pos, p->id, len) ; 76 pos += len ; 77 memcpy(modifs + pos, "S6_FDLIMIT_", 11) ; pos += 11 ; 78 pos += uint_fmt(modifs + pos, i) ; 79 if (tain_less(&p->limit, &halfinfinite)) 80 { 81 modifs[pos++] = '=' ; 82 pos += timestamp_fmt(modifs + pos, &p->limit) ; 83 } 84 modifs[pos++] = 0 ; 85 } 86 xmexec_n(argv+1, modifs, pos, 1 + 3*n) ; 87 } 88 }