1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/* ISC license. */
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/env.h>
#include <skalibs/sig.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#include <skalibs/netstring.h>
#include <execline/config.h>
#include <execline/execline.h>
#define USAGE "forstdin [ -p | -o okcode,okcode,... | -x breakcode,breakcode,... ] [ -N | -n ] [ -C | -c ] [ -0 | -d delim ] var command..."
#define dieusage() strerr_dieusage(100, USAGE)
static genalloc pids = GENALLOC_ZERO ; /* pid_t */
static int isok (unsigned short *tab, unsigned int n, int code)
{
unsigned int i = 0 ;
for (; i < n ; i++) if ((unsigned short)code == tab[i]) break ;
return i < n ;
}
static void parallel_sigchld_handler (int sig)
{
pid_t *tab = genalloc_s(pid_t, &pids) ;
size_t len = genalloc_len(pid_t, &pids) ;
int wstat ;
for (;;)
{
ssize_t r = wait_pids_nohang(tab, len, &wstat) ;
if (r <= 0) break ;
tab[r-1] = tab[--len] ;
}
genalloc_setlen(pid_t, &pids, len) ;
(void)sig ;
}
int main (int argc, char const **argv, char const *const *envp)
{
char const *delim = "\n" ;
size_t delimlen = 1 ;
size_t nbc = 0 ;
unsigned short okcodes[256] ;
int crunch = 0, chomp = 1, not = 1, eofcode = 1 ;
PROG = "forstdin" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "pNnCc0d:o:x:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'p' :
{
if (!genalloc_ready(pid_t, &pids, 1))
strerr_diefu1sys(111, "genalloc_ready") ;
break ;
}
case 'N' : chomp = 0 ; break ;
case 'n' : chomp = 1 ; break ;
case 'C' : crunch = 1 ; break ;
case 'c' : crunch = 0 ; break ;
case '0' : delim = "" ; delimlen = 1 ; break ;
case 'd' : delim = l.arg ; delimlen = strlen(delim) ; break ;
case 'o' :
not = 0 ;
if (!ushort_scanlist(okcodes, 256, l.arg, &nbc)) dieusage() ;
break ;
case 'x' :
not = 1 ;
if (!ushort_scanlist(okcodes, 256, l.arg, &nbc)) dieusage() ;
break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (argc < 2) dieusage() ;
{
stralloc modif = STRALLOC_ZERO ;
size_t envlen = env_len(envp) ;
size_t modifstart = strlen(argv[0]) + 1 ;
char const *newenv[envlen + 2] ;
if (!stralloc_ready(&modif, modifstart+1))
strerr_diefu1sys(111, "stralloc_ready") ;
memcpy(modif.s, argv[0], modifstart - 1) ;
modif.s[modifstart-1] = '=' ;
if (pids.s)
{
if (sig_catch(SIGCHLD, ¶llel_sigchld_handler) < 0)
strerr_diefu1sys(111, "install SIGCHLD handler") ;
}
for (;;)
{
pid_t pid ;
modif.len = modifstart ;
if (delimlen)
{
int r = skagetlnsep(buffer_0, &modif, delim, delimlen) ;
if (!r) break ;
else if (r < 0)
{
if (errno != EPIPE) strerr_diefu1sys(111, "skagetlnsep") ;
if (chomp) break ;
}
if (crunch && modif.len == modifstart + 1) continue ;
if (chomp) modif.len-- ;
}
else
{
size_t unread = 0 ;
if (netstring_get(buffer_0, &modif, &unread) <= 0)
{
if (netstring_okeof(buffer_0, unread)) break ;
else strerr_diefu1sys(111, "netstring_get") ;
}
}
eofcode = 0 ;
if (!stralloc_0(&modif)) strerr_diefu1sys(111, "stralloc_0") ;
if (!env_merge(newenv, envlen+2, envp, envlen, modif.s, modif.len))
strerr_diefu1sys(111, "merge environment") ;
if (pids.s) sig_block(SIGCHLD) ;
pid = el_spawn0(argv[1], argv + 1, newenv) ;
if (!pid) strerr_diefu2sys(111, "spawn ", argv[1]) ;
if (pids.s)
{
if (!genalloc_append(pid_t, &pids, &pid))
strerr_diefu1sys(111, "genalloc_append") ;
sig_unblock(SIGCHLD) ;
}
else
{
int wstat ;
if (wait_pid(pid, &wstat) < 0)
strerr_diefu2sys(111, "wait for ", argv[1]) ;
if (not == isok(okcodes, nbc, wait_estatus(wstat)))
return wait_estatus(wstat) ;
}
}
stralloc_free(&modif) ;
}
if (pids.s)
for (;;)
{
sig_block(SIGCHLD) ;
if (!pids.len) break ;
sig_pause() ;
}
return eofcode ;
}
|
