ac88ce4f7f
The mount() and bind() syscalls return -1 on error, and the mountid sequence number on success. The manpage states that the mountid sequence number is a positive integer, but the kernels implementation currently uses a unsigned 32-bit integer and does not guarantee that the mountid will not become negative. Most code just cares about the error, so test for the -1 error value only.
53 lines
832 B
C
53 lines
832 B
C
#include <u.h>
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#include <libc.h>
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void usage(void);
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void
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main(int argc, char *argv[])
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{
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ulong flag = 0;
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int qflag = 0;
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ARGBEGIN{
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case 'a':
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flag |= MAFTER;
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break;
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case 'b':
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flag |= MBEFORE;
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break;
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case 'c':
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flag |= MCREATE;
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break;
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case 'q':
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qflag = 1;
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break;
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default:
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usage();
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}ARGEND
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if(argc != 2 || (flag&MAFTER)&&(flag&MBEFORE))
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usage();
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if(bind(argv[0], argv[1], flag) == -1){
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if(qflag)
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exits(0);
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/* try to give a less confusing error than the default */
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if(access(argv[0], 0) < 0)
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fprint(2, "bind: %s: %r\n", argv[0]);
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else if(access(argv[1], 0) < 0)
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fprint(2, "bind: %s: %r\n", argv[1]);
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else
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fprint(2, "bind %s %s: %r\n", argv[0], argv[1]);
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exits("bind");
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}
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exits(0);
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}
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void
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usage(void)
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{
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fprint(2, "usage: bind [-b|-a|-c|-bc|-ac] new old\n");
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exits("usage");
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}
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