8b4e2a08fe
swtch idles on per-CPU stack, not on calling process's stack fix pipe bugs usertest.c tests pipes, fork, exit, close
59 lines
564 B
C
59 lines
564 B
C
int
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fork()
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{
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asm("mov $1, %eax");
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asm("int $48");
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}
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int
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exit()
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{
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asm("mov $2, %eax");
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asm("int $48");
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}
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void
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cons_putc(int c)
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{
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asm("mov $4, %eax");
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asm("int $48");
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}
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int
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puts(char *s)
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{
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int i;
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for(i = 0; s[i]; i++)
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cons_putc(s[i]);
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return i;
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}
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int
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pipe(int fds[])
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{
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asm("mov $5, %eax");
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asm("int $48");
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}
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int
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read(int fd, char *buf, int n)
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{
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asm("mov $7, %eax");
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asm("int $48");
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}
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int
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write(int fd, char *buf, int n)
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{
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asm("mov $6, %eax");
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asm("int $48");
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}
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int
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close(int fd)
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{
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asm("mov $8, %eax");
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asm("int $48");
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}
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