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Add a default exec path logic.

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This adds default/fallback logic to determine the b2 exec absolute path
as possible. It uses the arg0 and current dir or path to construct the
liekliest path.

fixes #25
This commit is contained in:
Rene Rivera
2021-05-29 22:09:13 -05:00
parent ecaa7a9bda
commit 91fd728f3e
4 changed files with 116 additions and 75 deletions
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73
src/engine/jam.cpp
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@@ -707,76 +707,3 @@ int main( int argc, char * * argv )
return status ? EXITBAD : EXITOK;
}
/*
* executable_path()
*/
#if defined(_WIN32)
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
char * executable_path( char const * argv0 )
{
char buf[ 1024 ];
DWORD const ret = GetModuleFileNameA( NULL, buf, sizeof( buf ) );
return ( !ret || ret == sizeof( buf ) ) ? NULL : strdup( buf );
}
#elif defined(__APPLE__) /* Not tested */
# include <mach-o/dyld.h>
char *executable_path( char const * argv0 )
{
char buf[ 1024 ];
uint32_t size = sizeof( buf );
return _NSGetExecutablePath( buf, &size ) ? NULL : strdup( buf );
}
#elif defined(sun) || defined(__sun) /* Not tested */
# include <stdlib.h>
char * executable_path( char const * argv0 )
{
const char * execname = getexecname();
return execname ? strdup( execname ) : NULL;
}
#elif defined(__FreeBSD__)
# include <sys/sysctl.h>
char * executable_path( char const * argv0 )
{
int mib[ 4 ] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
char buf[ 1024 ];
size_t size = sizeof( buf );
sysctl( mib, 4, buf, &size, NULL, 0 );
return ( !size || size == sizeof( buf ) ) ? NULL : strndup( buf, size );
}
#elif defined(__linux__) || defined(__CYGWIN__) || defined(__GNU__)
# include <unistd.h>
char * executable_path( char const * argv0 )
{
char buf[ 1024 ];
ssize_t const ret = readlink( "/proc/self/exe", buf, sizeof( buf ) );
return ( !ret || ret == sizeof( buf ) ) ? NULL : strndup( buf, ret );
}
#elif defined(OS_VMS)
# include <unixlib.h>
char * executable_path( char const * argv0 )
{
char * vms_path = NULL;
char * posix_path = NULL;
char * p;
/* On VMS argv[0] shows absolute path to the image file.
* So, just remove VMS file version and translate path to POSIX-style.
*/
vms_path = strdup( argv0 );
if ( vms_path && ( p = strchr( vms_path, ';') ) ) *p = '\0';
posix_path = decc$translate_vms( vms_path );
if ( vms_path ) free( vms_path );
return posix_path > 0 ? strdup( posix_path ) : NULL;
}
#else
char * executable_path( char const * argv0 )
{
/* If argv0 is an absolute path, assume it is the right absolute path. */
return argv0[ 0 ] == '/' ? strdup( argv0 ) : NULL;
}
#endif