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
|
/* ISC license. */
#include <string.h>
#include <skalibs/djbunix.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr2.h>
#define USAGE "exec [ -c ] [ -l ] [ -a argv0 ] prog..."
int main (int argc, char const **argv, char const *const *envp)
{
static char const *const zero = 0 ;
char const *executable = 0 ;
char const *argv0 = 0 ;
int dash = 0 ;
PROG = "exec" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "cla:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'c' : envp = &zero ; break ;
case 'l' : dash = 1 ; break ;
case 'a' : argv0 = l.arg ; break ;
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) strerr_dieusage(100, USAGE) ;
executable = argv[0] ;
if (argv0) argv[0] = argv0 ;
if (dash)
{
size_t n = strlen(argv[0]) ;
char dashed[n+2] ;
dashed[0] = '-' ;
memcpy(dashed+1, argv[0], n+1) ;
argv[0] = (char const *)dashed ;
pathexec_run(executable, argv, envp) ;
}
else pathexec_run(executable, argv, envp) ;
strerr_dieexec(111, executable) ;
}
|
